CN111734531B - Self-excitation multipoint jet plasma igniter - Google Patents
Self-excitation multipoint jet plasma igniter Download PDFInfo
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- CN111734531B CN111734531B CN202010089719.2A CN202010089719A CN111734531B CN 111734531 B CN111734531 B CN 111734531B CN 202010089719 A CN202010089719 A CN 202010089719A CN 111734531 B CN111734531 B CN 111734531B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
- F02C7/264—Ignition
- F02C7/266—Electric
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Abstract
A self-excited multipoint jet plasma igniter is composed of a shell (101), an insulator (102), jet cavities (103-1-103-4) and discharge electrodes (201-206). Compared with the traditional single-jet igniter, the self-excited multipoint jet plasma igniter can make up the defects of fixed single-jet direction and weak environmental adaptability because the self-excited multipoint jet plasma igniter can generate a plurality of jets. Meanwhile, a plurality of adjacent ignition sources are formed by the initial fire nuclei formed by the plurality of jet flows, so that the ignition capability is effectively improved. In conclusion, the igniter has stronger ignition capability.
Description
Technical Field
The invention belongs to the field of design of aero-engine combustion chambers, and particularly relates to a self-excitation multipoint jet plasma igniter which is suitable for reliable ignition in an aero-engine combustion chamber under an extreme high altitude condition.
Background
The plasma jet ignition has pneumatic effect, thermal effect and chemical effect, has stronger ignition capability, shows excellent ignition performance in various engine combustion chambers such as aviation turbine engines, sub-combustion ramjet engines, super-combustion ramjet engines and the like, and is considered as the most possible technical scheme for replacing the current spark igniter.
At present, the flight envelope of an aircraft is continuously widened, and an igniter is inevitably required to reliably ignite an engine in a wider range so as to ensure the flight safety. When the engine works and deviates from the design working condition, parameters such as pressure, temperature, flow speed and the like of the combustion chamber are different from those under the optimal ignition working condition, and the optimal ignition position is changed. But is limited by the limited space of the combustion chamber of the engine, only two igniters can be installed in the combustion chamber, and the installation positions of the igniters are fixed. Moreover, all plasma jet igniters studied at present are single jet orifice solutions. In this case, the direction of the flame kernel generated by the igniter is fixed, and the area is small. Therefore, the ignition capability of the plasma jet igniter in the form of a single jet hole inevitably decreases when the ignition condition deviates from the optimum design point. Therefore, the reliable ignition range of the current plasma jet igniter in the form of a single jet hole cannot meet the actual requirement.
Disclosure of Invention
In view of the above, the invention provides a self-excited multipoint jet plasma igniter, aiming at the defects that the existing jet igniter is a single jet hole, the direction of plasma jet is fixed, and the environmental adaptability of the igniter is insufficient.
The invention relates to a self-excited multipoint jet plasma igniter which comprises a shell 101, an insulator 102, jet cavities (103-1-103-4) and discharge electrodes (201-206); it is characterized in that
The shell 101 is made of high-temperature-resistant high-temperature alloy, and is of a hollow cylindrical structure as a whole, and an inner cavity is used for mounting the insulator 102;
the insulator 102 is a cylinder with a hole in the inner part, is processed by a high-temperature-resistant insulator, is embedded in the igniter shell 101 and is tightly connected with the igniter shell 101, and the front end of the insulator 102 is flush with the front end of the igniter shell 101; a plurality of circular shallow cavities are processed at the front end of the insulator 102 at intervals to form jet cavities (103-1, 103-2, 103-3 and 103-4), the jet cavities are uniformly distributed around the center of the insulator 102, the axis of the jet cavities is parallel to the axis of the insulator 102, the number of the jet cavities is multiple, and the specific number is determined according to actual needs; a plurality of circular deep cavities are processed at the rear end of the insulator 102 at intervals, the axes of the circular deep cavities are parallel to the axis of the insulator 102, and the circular deep cavities are used for inserting discharge electrodes (201-206) and named as electrode holes; determining the number of the electrode holes according to the number of the jet flow cavities, wherein every two adjacent jet flow cavities are used as a group and are matched with three electrode holes; in a group of jet cavities, seen from the cross section of the cavity, the positions of two corresponding far ends in two adjacent jet cavities correspond to the positions of two electrode holes, and the relative outermost sides of the two electrode hole cavities are basically consistent with the outermost sides of the cavities corresponding to the jet cavities, namely, seen from the cross section, the two electrode holes are contained in the jet cavities and are arranged close to the inner walls of the relative outermost sides of the jet cavities; between the two adjacent jet cavities, corresponding to the position of the third electrode hole, the electrode hole is just positioned in the middle of the two adjacent jet cavities, but the electrode hole respectively protrudes from the side walls of the two adjacent jet cavities, so that plasma discharge can be generated between the electrode in the electrode hole and the electrodes in the other two electrode holes; thus, the cross-sectional area of the jet chamber must be greater than the cross-sectional area of the electrode bore;
the discharge electrodes (201-206) are processed into a cylinder shape by high-temperature resistant materials, are inserted from the rear part of the igniter along the electrode holes and protrude out of the bottom of the discharge cavity.
In one embodiment of the present invention, the outer diameter of the housing 101 is 16 to 22mm, and the diameter of the inner through hole is 8 to 15 mm; the insulator 102 is made of high-temperature-resistant ceramic, and the outer diameter of the insulator 102 is the same as that of the through hole in the shell 101; the interval of the jet flow cavities is 0.5-2 mm, the diameter of the jet flow cavity is 2-5 mm, and the depth of the cavity is 5-15 mm; the diameter of the electrode is 1-3 mm, the diameter of the electrode hole is the same as that of the electrode, and the electrode hole and the electrode are tightly matched; the distance between two electrodes in the same jet cavity is 1-5 mm; the discharge electrodes (201-206) protrude out of the bottom of the current-emitting cavity by 1-5 mm.
In one embodiment of the invention, the outer diameter of the housing 101 is 18 mm; the diameter of the inner through hole is 14 mm; the interval of the jet flow cavities is 1mm, the diameter of the jet flow cavity is 3mm, and the depth of the cavity is 7 mm; the diameter of the electrode is 1.5 mm; the distance between two electrodes in the same jet cavity is 1.5 mm; the bottom of the discharge electrode (201-206) is 3mm of the convex emergent flow cavity.
In another embodiment of the present invention, the number of the jet cavity is 4, and the number of the electrode holes is 6; wherein the first and second fluidic chambers 103-1, 103-2 are a group, and the mating electrodes are the first, second and third electrodes 201, 202, 203, wherein the first and third electrodes 201, 203 are two distal electrodes, and the second electrode 202 is a middle electrode; the second electrode 202 is shared by two fluidic chambers, i.e., the second electrode 202 serves as the cathode of the discharge electrode pair of the first fluidic chamber 103-1 and also serves as the anode of the discharge electrode pair of the second fluidic chamber 103-2; the anode of the first fluidic chamber 103-1 discharge electrode pair is the first electrode 201, and the cathode of the second fluidic chamber 103-2 discharge electrode pair is the third electrode 203; similarly, the third and fourth fluidic chambers 103-3 and 103-4 are a set, and the mating electrodes are the fourth, fifth and sixth electrodes 204, 205 and 206, wherein the fourth and sixth electrodes 204 and 206 are two distal electrodes, and the fifth electrode 205 is a middle electrode; the cathode of the third fluidic chamber 103-3 discharge electrode pair is the sixth electrode 206 and the anode of the fourth fluidic chamber 103-4 discharge electrode pair is the fourth electrode 204; when four jet flow cavities are adopted for design, the relationship between the jet flow cavities and the electrodes is as follows: the first jet cavity 103-1 is provided with a first discharge electrode 201 and a second discharge electrode 202; second and third discharge electrodes 202 and 203 are arranged in the second jet cavity 103-2; fifth and sixth discharge electrodes 205 and 206 are installed in the third fluidic chamber 103-3; fourth and fifth discharge electrodes 204 and 205 are installed in the fourth fluidic chamber 103-4.
In one embodiment of the invention, the shell 101 is externally provided with mounting threads 104, a positioning hexagonal boss 105 and firing cable connecting threads 106;
the mounting threads 104 are sized to receive the igniter in the combustion chamber to which it is mounted for securing the igniter; the positioning hexagonal boss 105 is used for accurately positioning the distance between the head of the igniter and the wall surface of the combustion chamber; threads 106 are located at the bottom most portion of the igniter for connection to a high voltage ignition cable.
The ignition circuit based on the self-excited multipoint jet plasma igniter is characterized in that a first discharge electrode 201 is connected with an anode of a plasma power supply, a sixth electrode 206 is connected with a cathode of the power supply, a third electrode 203, a fourth electrode 204 are directly connected and then connected with one end of a first coupling capacitor, the other end of the first coupling capacitor is connected with the cathode of the power supply, a second electrode 202, a fifth electrode 205 are connected with one end of a second coupling capacitor, and the other end of the second coupling capacitor is connected with the cathode of the power supply.
In one embodiment of the invention, the output waveform of the plasma power supply 301 is pulse high voltage, the output voltage is 5-20 KV, the frequency is not less than 5Hz, and the unit output energy is not less than 12J; the capacitance value of the coupling capacitor 302 needs to be matched with the power of a power supply, the range is 100-1000 PF, and the withstand voltage value is 5-30 KV.
In addition, an operating method based on the self-excited multipoint jet plasma igniter is provided, which is characterized in that: the plasma power supply 301 outputs a pulse high-voltage signal, and under the action of the coupling capacitor 302, multi-gap structures formed among the discharge electrodes (201-206) are sequentially broken down to form a plurality of discharge channels 401; after the discharge channel 401 is formed, the plasma power supply rapidly releases energy through the discharge channel; one discharge gap arranged in each jet flow cavity can release energy to heat gas in the corresponding jet flow cavity; the gas is sprayed out of the flow cavity after being heated and pressurized, thereby forming a plurality of strands of plasma jet.
The self-excited multipoint jet plasma igniter is different from the traditional single jet ignition, and a plurality of discharge electrodes are arranged at the bottoms of a plurality of self-lasing jet cavities by utilizing a multi-path discharge circuit. The unique advantages of multi-path discharge are utilized to realize the simultaneous discharge of a plurality of discharge channels. The gas in the cavity is heated by the energy released by the discharge, the pressure is increased due to the increase of the gas temperature, and the inner discharge jet exit flow cavity is driven, so that a plurality of strands of plasma jet flows are formed.
Compared with the traditional single-jet igniter, the self-excited multipoint jet plasma igniter can make up the defects of fixed single-jet direction and weak environmental adaptability because the self-excited multipoint jet plasma igniter can generate a plurality of jets. Meanwhile, a plurality of adjacent ignition sources are formed by the initial fire nuclei formed by the plurality of jet flows, so that the ignition capability is effectively improved. In conclusion, the igniter has stronger ignition capability.
Drawings
FIG. 1 is a schematic diagram of a self-exciting multi-spot jet plasma igniter of the invention;
FIG. 2 is a schematic diagram of a top view and electrode arrangement of a self-exciting multi-spot jet plasma igniter of the invention;
FIG. 3 is a schematic diagram of the electrical connections of a self-exciting multi-spot jet plasma igniter of the invention;
fig. 4 is a schematic diagram of multiple plasma jets produced from a self-exciting multi-spot jet plasma igniter.
Reference numerals:
101-casing
102-insulator
103-1, 103-2, 103-3, 103-4-fluidic chamber
104-mounting screw
105-positioning hexagonal boss
106-ignition cable mounting screw
201. 202, 203, 204, 205, 206-ignition electrode
301-plasma power supply
302-coupling capacitor
401-plasma jet
Detailed Description
The invention will now be further described with reference to figures 1, 2, 3 and 4.
The self-excited multipoint jet plasma igniter comprises a shell 101, an insulator 102, jet cavities (103-1-103-4) and discharge electrodes (201-206). The shell 101 is formed by processing high-temperature-resistant high-temperature alloy, and is of a hollow cylindrical structure as a whole, the inner cavity is used for mounting the insulator 102, and the outer part is provided with mounting threads 104, a positioning hexagonal boss 105 and ignition cable connecting threads 106. The insulator 102 is a cylinder with a hole inside, is formed by processing high-temperature-resistant ceramics, is embedded in the igniter shell 101 and is tightly connected with the igniter shell 101, and the front end of the insulator 102 (the head position of the igniter) is flush with the front end of the igniter shell 101. A plurality of circular shallow cavities are processed at the front end of the insulator 102 at intervals to form jet cavities (103-1, 103-2, 103-3 and 103-4), the jet cavities are generally uniformly distributed around the center of the insulator 102, the axis of the jet cavities is parallel to the axis of the insulator 102, the number of the jet cavities is multiple, and the specific number is determined according to actual needs. A plurality of circular deep cavities are processed at the rear end of the insulator 102 at intervals, the axes of the circular deep cavities are parallel to the axis of the insulator 102, and the circular deep cavities are used for inserting discharge electrodes (201-206) and named as electrode holes; and determining the number of the electrode holes according to the number of the jet flow cavities, wherein every two adjacent jet flow cavities are matched with three electrode holes. As shown in fig. 2, when viewed from the cross section of the cavity, near the corresponding distal end positions in two adjacent fluidic cavities, corresponding to the positions of two electrode holes, the outermost sides of the two electrode hole cavities are substantially identical to the outermost sides of the cavities corresponding to the fluidic cavities, that is, when viewed from the cross section, the two electrode holes are contained in the fluidic cavities and arranged close to the inner walls of the outermost sides of the fluidic cavities. And between the two adjacent jet cavities, corresponding to the position of the third electrode hole, the electrode hole is positioned right in the middle of the two adjacent jet cavities, but the electrode hole respectively protrudes from the side walls of the two adjacent jet cavities by a part, so that the electrode in the electrode hole and the electrodes in the other two electrode holes can generate plasma discharge. Thus, the cross-sectional area of the jet chamber must be greater than the cross-sectional area of the electrode bore. The discharge electrodes (201-206) are processed into a cylinder shape by high-temperature resistant materials, are inserted from the rear part of the igniter along the electrode holes and protrude out of the bottom of the discharge cavity.
In one embodiment of the invention, the number of jet chambers is 4 and the number of electrode holes is 6. Wherein the first and second fluidic chambers 103-1, 103-2 are a set, and the mating electrodes are the first, second and third electrodes 201, 202, 203, wherein the first and third electrodes 201, 203 are two distal electrodes, and the second electrode 202 is a middle electrode. In order to reasonably utilize space and reduce the number of discharge electrodes, the second electrode 202 is shared by two jet cavities, namely the second electrode 202 is used as a cathode of a discharge electrode pair of the first jet cavity 103-1 and also used as an anode of a discharge electrode pair of the second jet cavity 103-2; the anode of the first fluidic chamber 103-1 discharge electrode pair is the first electrode 201 and the cathode of the second fluidic chamber 103-2 discharge electrode pair is the third electrode 203. Similarly, the third and fourth fluidic chambers 103-3 and 103-4 are a set, and the mating electrodes are the fourth, fifth and sixth electrodes 204, 205 and 206, wherein the fourth and sixth electrodes 204 and 206 are two distal electrodes, and the fifth electrode 205 is a middle electrode; the cathode of the third fluidic chamber 103-3 discharge electrode pair is the sixth electrode 206 and the anode of the fourth fluidic chamber 103-4 discharge electrode pair is the fourth electrode 204. When four jet flow cavities are adopted for design, the relationship between the jet flow cavities and the electrodes is as follows: the first jet cavity 103-1 is provided with a first discharge electrode 201 and a second discharge electrode 202; second and third discharge electrodes 202 and 203 are arranged in the second jet cavity 103-2; fifth and sixth discharge electrodes 205 and 206 are installed in the third fluidic chamber 103-3; fourth and fifth discharge electrodes 204 and 205 are installed in the fourth fluidic chamber 103-4. The threads 104 are sized to receive the igniter in the combustion chamber to which it is mounted for securing the igniter; the positioning hexagonal boss 105 is used to accurately position the distance of the igniter head from the combustion chamber wall. Threads 106 are located at the bottom most portion of the igniter for connection to a high voltage ignition cable.
As shown in fig. 3, the first discharge electrode 201 is connected to the anode of the plasma power supply, the sixth electrode 206 is connected to the cathode of the power supply, the third and fourth electrodes 203 and 204 are directly connected to the coupling capacitor and then connected to the cathode of the power supply, and the second and fifth electrodes 202 and 205 are connected to the coupling capacitor and then connected to the cathode of the power supply.
In one embodiment of the invention, the self-excited multipoint jet plasma igniter is composed of a shell 101, an insulator 102, jet cavities (103-1-103-4), mounting threads 104, a positioning hexagonal boss 105, ignition cable connecting threads 106 and discharge electrodes (201-206). Casing 101 is formed by high temperature resistant nickel base superalloy processing, wholly is hollow cylinder structure, and outside diameter is 16 ~ 22mm, preferred 18mm, and inside processing through-hole is in order to install insulator 102, and the hole diameter is 8 ~ 15mm, preferred 14mm, outside processing installation screw thread 104, location hexagonal boss 105 and ignition cable connecting thread 106. The insulator 102 is made of high temperature resistant ceramics, is embedded in the igniter housing 101, has a cylindrical shape, and has the same diameter as the diameter of the through hole of the housing 101. A plurality of circular shallow cavities are machined on the front end face of the insulator at intervals to form first to fourth jet cavities (103-1, 103-2, 103-3 and 103-4), the interval of the jet cavities (namely the shortest distance between the jet cavities) is 0.5-2 mm, preferably 1mm, the diameter of the jet cavity is 2-5 mm, preferably 3mm, and the depth of the cavity is 5-15 mm, preferably 7 mm. A plurality of circular deep cavities are processed at the rear end of the insulator 102 at intervals to serve as electrode holes for mounting first to sixth discharge electrodes (201-206). The discharge electrodes (201-206) are made of high-temperature-resistant alloy materials, preferably nickel-based high-temperature alloy, the diameter of each electrode is 1-3 mm, preferably 1.5mm, the diameter of each electrode hole is the same as that of each electrode, the electrode holes and the electrodes are tightly matched, and the diameter of each electrode is smaller than that of the jet cavity. For a reasonable space utilization, the second and fifth electrodes 202, 205 belong to a common electrode and can be shared by the two fluidic chambers. The distance between the two electrodes in the same jet cavity is 1-5 mm, and preferably 1.5 mm. In order to ensure stable discharge, the electrode protrudes out of the electrode hole and extends into the current cavity, and the protruding height is 1-5 mm, preferably 3 mm. The threads 104 are sized to receive the igniter in the combustion chamber to which it is mounted for securing the igniter; the positioning hexagonal boss 105 is used to accurately position the distance of the igniter head from the combustion chamber wall. The threads 106 are located at the bottom most portion of the igniter for connection to a high voltage ignition cable, typically of size M18 x 1.0. The output waveform of the plasma power supply 301 is pulse high voltage, the output voltage is 5-20 KV, the frequency is not less than 5Hz, and the unit output energy is not less than 12J. The capacitance value of the coupling capacitor 302 needs to be matched with the power of a power supply, the range is 100-1000 PF, and the withstand voltage value is 5-30 KV.
The working process of the self-excited multipoint jet plasma igniter is as follows: the plasma power supply 301 outputs a pulse high-voltage signal, and under the action of the coupling capacitor 302, the multi-gap structures formed between the discharge electrodes (201-206) are sequentially broken down to form a plurality of discharge channels 401. When the discharge channel 401 is formed, the plasma power supply rapidly discharges energy through the discharge channel. One discharge gap provided in each fluidic chamber releases energy to heat the gas in the corresponding fluidic chamber. The gas is sprayed out of the flow cavity after being heated and pressurized, thereby forming a plurality of strands of plasma jet. Because the jet flow quantity is large, the formed fire core is large, the coverage area is wide, the problem of poor environmental application caused by small jet flow quantity and fixed direction of the existing single jet flow igniter can be effectively solved, and the ignition reliability is effectively improved.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In one embodiment of the invention, the self-excited multipoint jet plasma igniter is composed of a shell 101, an insulator 102, jet cavities (103-1-103-4), mounting threads 104, a positioning hexagonal boss 105, ignition cable connecting threads 106 and discharge electrodes (201-206). The shell 101 is formed by processing high-temperature-resistant nickel-based high-temperature alloy, is of a hollow cylindrical structure as a whole, has a diameter of 18mm, is provided with an internal processing through hole for mounting the insulator 102, has a hole diameter of 14mm, and is provided with an external processing mounting thread 104, a positioning hexagonal boss 105 and an ignition cable connecting thread 106. The insulator 102 is made of high temperature resistant ceramics, is embedded in the igniter housing 101, has a cylindrical shape, and has the same diameter as the diameter of the through hole of the housing 101. A plurality of circular cavities are processed at intervals on the end face of the insulator to form first to fourth jet cavities (103-1, 103-2, 103-3 and 103-4), the interval of the circular cavities is 1mm, the diameter is 3mm, and the depth of the cavities is 7 mm. And holes are punched on two sides of the jet flow cavity and used for mounting first to sixth discharge electrodes (201-206). The discharge electrode is made of high-temperature-resistant alloy material, preferably nickel-based high-temperature alloy, and the diameter of the electrode is 1.5 mm. For a reasonable use of space, the second and fifth electrodes 202, 205 are shared by the two fluidic chambers. The electrode spacing in the same jet cavity is 1.5 mm. In order to ensure the stable discharge, the electrode protrudes out of the current cavity, and the protruding height is 3 mm. The threads 104 are sized to receive the igniter in the combustion chamber to which it is mounted for securing the igniter; the positioning hexagonal boss 105 is used to accurately position the distance of the igniter head from the combustion chamber wall. The threads 106 are located at the bottom most portion of the igniter for connection to a high voltage ignition cable, typically of size M18 x 1.0. The output waveform of the plasma power supply 301 is pulse high voltage, the output voltage is 5KV, the frequency is 8Hz, and the unit output energy is 20J. The capacitance value of the coupling capacitor 302 is 100PF, and the withstand voltage value is 10 KV.
Claims (8)
1. A self-excited multipoint jet plasma igniter is composed of a shell (101), an insulator (102), jet cavities (103-1-103-4) and discharge electrodes (201-206); it is characterized in that
The shell (101) is processed by high-temperature-resistant high-temperature alloy, the whole shell is of a hollow cylindrical structure, and an inner cavity is used for installing the insulator (102);
the insulator (102) is a cylinder with a hole formed in the inner part, is processed by a high-temperature-resistant insulator, is embedded in the igniter shell (101) and is tightly connected with the igniter shell (101), and the front end of the insulator (102) is flush with the front end of the igniter shell (101); a plurality of circular shallow cavities are processed at the front end of the insulator (102) at intervals to form jet cavities (103-1, 103-2, 103-3 and 103-4), the jet cavities are uniformly distributed around the center of a circle of the insulator (102), the axis of the jet cavities is parallel to the axis of the insulator (102), the number of the jet cavities is multiple, and the specific number is determined according to actual needs; a plurality of circular deep cavities are processed at the rear end of the insulator (102) at intervals, the axes of the circular deep cavities are parallel to the axis of the insulator (102), and the circular deep cavities are used for inserting discharge electrodes (201-206) and named as electrode holes; determining the number of the electrode holes according to the number of the jet flow cavities, wherein every two adjacent jet flow cavities are used as a group and are matched with three electrode holes; in a group of jet cavities, seen from the cross section of the cavity, the positions of two corresponding far ends in two adjacent jet cavities correspond to the positions of two electrode holes, and the relative outermost sides of the two electrode hole cavities are basically consistent with the outermost sides of the cavities corresponding to the jet cavities, namely, seen from the cross section, the two electrode holes are contained in the jet cavities and are arranged close to the inner walls of the relative outermost sides of the jet cavities; between the two adjacent jet cavities, corresponding to the position of the third electrode hole, the electrode hole is just positioned in the middle of the two adjacent jet cavities, but the electrode hole respectively protrudes from the side walls of the two adjacent jet cavities, so that plasma discharge can be generated between the electrode in the electrode hole and the electrodes in the other two electrode holes; whereby the cross-sectional area of the fluidic chamber is greater than the cross-sectional area of the electrode aperture;
the discharge electrodes (201-206) are processed into a cylinder shape by high-temperature resistant materials, are inserted from the rear part of the igniter along the electrode holes and protrude out of the bottom of the discharge cavity.
2. The self-exciting multi-spot jet plasma igniter as claimed in claim 1, wherein the shell (101) has an outer diameter of 16 to 22mm and an inner through hole diameter of 8 to 15 mm; the insulator (102) is made of high-temperature-resistant ceramic, and the outer diameter of the insulator (102) is the same as that of the through hole in the shell (101); the interval of the jet flow cavities is 0.5-2 mm, the diameter of the jet flow cavity is 2-5 mm, and the depth of the cavity is 5-15 mm; the diameter of the electrode is 1-3 mm, the diameter of the electrode hole is the same as that of the electrode, and the electrode hole and the electrode are tightly matched; the distance between two electrodes in the same jet cavity is 1-5 mm; the discharge electrodes (201-206) protrude out of the bottom of the current-emitting cavity by 1-5 mm.
3. The self-exciting multi-spot jet plasma igniter as claimed in claim 2, wherein the outer diameter of the housing (101) is 18 mm; the diameter of the inner through hole is 14 mm; the interval of the jet flow cavities is 1mm, the diameter of the jet flow cavity is 3mm, and the depth of the cavity is 7 mm; the diameter of the electrode is 1.5 mm; the distance between two electrodes in the same jet cavity is 1.5 mm; the bottom of the discharge electrode (201-206) is 3mm of the convex emergent flow cavity.
4. A self-exciting multi-spot jet plasma igniter as claimed in claim 1, wherein the number of the jet chamber is 4, and the number of the electrode holes is 6; wherein the first and second fluidic chambers (103-1, 103-2) are a group, the mating electrodes are first, second and third electrodes (201, 202, 203), wherein the first and third electrodes (201, 203) are two distal electrodes, and the second electrode (202) is a middle electrode; the second electrode (202) is shared by the two jet cavities, namely the second electrode (202) is used as a cathode of a discharge electrode pair of the first jet cavity (103-1) and also used as an anode of the discharge electrode pair of the second jet cavity (103-2); the anode of the discharge electrode pair in the first fluidic cavity (103-1) is a first electrode (201), and the cathode of the discharge electrode pair in the second fluidic cavity (103-2) is a third electrode (203); similarly, the third and fourth fluidic cavities (103-3, 103-4) are a group, and the mating electrodes are fourth, fifth and sixth electrodes (204, 205, 206), wherein the fourth and sixth electrodes (204, 206) are two distal electrodes, and the fifth electrode (205) is a middle electrode; the cathode of the discharge electrode pair in the third fluidic cavity (103-3) is a sixth electrode (206), and the anode of the discharge electrode pair in the fourth fluidic cavity (103-4) is a fourth electrode (204); when four jet flow cavities are adopted for design, the relationship between the jet flow cavities and the electrodes is as follows: the first jet cavity (103-1) is internally provided with a first discharge electrode (201) and a second discharge electrode (202); a second discharge electrode (202) and a third discharge electrode (203) are arranged in the second jet cavity (103-2); fifth and sixth discharge electrodes (205, 206) are arranged in the third jet cavity (103-3); the fourth jet cavity (103-4) is provided with a fourth discharge electrode (204) and a fifth discharge electrode (205).
5. The self-exciting multi-spot jet plasma igniter as claimed in claim 1, wherein the housing (101) is externally provided with mounting threads (104), a positioning hexagonal boss (105) and ignition cable connecting threads (106);
the mounting thread (104) is dimensioned to receive the igniter in a combustion chamber for holding the igniter; the positioning hexagonal boss (105) is used for accurately positioning the distance between the head of the igniter and the wall surface of the combustion chamber; the connecting thread (106) is located at the bottommost portion of the igniter and is used for connecting with a high-voltage ignition cable.
6. Ignition circuit comprising a self-exciting multi-jet plasma igniter according to claim 4, characterized in that the first discharge electrode (201) is connected to the anode of the plasma power supply, the sixth electrode (206) is connected to the cathode of the power supply, the third and fourth electrodes (203, 204) are directly connected and then connected to one end of a first coupling capacitor, the other end of which is connected to the cathode of the power supply, the second and fifth electrodes (202, 205) are connected to one end of a second coupling capacitor, the other end of which is connected to the cathode of the power supply.
7. The ignition circuit according to claim 6, wherein the output waveform of the plasma power supply (301) is a pulse high voltage, the output voltage is 5-20 KV, the frequency is not less than 5Hz, and the unit output energy is not less than 12J; the capacitance value of the coupling capacitor (302) needs to be matched with the power of a power supply, the range is 100-1000 PF, and the withstand voltage value is 5-30 KV.
8. A method of operating a self-exciting multi-spot jet plasma igniter, as defined in claim 4, wherein: the plasma power supply (301) outputs a pulse high-voltage signal, and under the action of the coupling capacitor (302), multi-gap structures formed among the discharge electrodes (201-206) are sequentially broken down to form a plurality of discharge channels 401; after the discharge channel (401) is formed, the plasma power supply rapidly releases energy through the discharge channel; one discharge gap arranged in each jet flow cavity can release energy to heat gas in the corresponding jet flow cavity; the gas is sprayed out of the flow cavity after being heated and pressurized, thereby forming a plurality of strands of plasma jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010089719.2A CN111734531B (en) | 2020-01-18 | 2020-01-18 | Self-excitation multipoint jet plasma igniter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010089719.2A CN111734531B (en) | 2020-01-18 | 2020-01-18 | Self-excitation multipoint jet plasma igniter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111734531A CN111734531A (en) | 2020-10-02 |
| CN111734531B true CN111734531B (en) | 2022-01-07 |
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| CN113464313B (en) * | 2021-08-05 | 2022-10-18 | 中国人民解放军国防科技大学 | Parallel type multipath sliding arc plasma igniter and scramjet engine |
| CN115614165B (en) * | 2022-11-02 | 2024-05-10 | 西安近代化学研究所 | Plasma flame stabilizing device for supersonic combustion of powder fuel |
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| US4555750A (en) * | 1981-09-22 | 1985-11-26 | Susumu Matsumura | Control apparatus for D.C. power transmission system |
| CN104879780A (en) * | 2014-02-28 | 2015-09-02 | 北京大学 | Multichannel plasma area igniting burner |
| CN109361154A (en) * | 2018-10-30 | 2019-02-19 | 中国人民解放军空军工程大学 | A kind of self-excitation type jet stream spark lighter |
| CN109611214A (en) * | 2018-11-07 | 2019-04-12 | 中国人民解放军空军工程大学 | Swipe plasma jet igniter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20190186369A1 (en) * | 2017-12-20 | 2019-06-20 | Plasma Igniter, LLC | Jet Engine with Plasma-assisted Combustion |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4555750A (en) * | 1981-09-22 | 1985-11-26 | Susumu Matsumura | Control apparatus for D.C. power transmission system |
| CN104879780A (en) * | 2014-02-28 | 2015-09-02 | 北京大学 | Multichannel plasma area igniting burner |
| CN109361154A (en) * | 2018-10-30 | 2019-02-19 | 中国人民解放军空军工程大学 | A kind of self-excitation type jet stream spark lighter |
| CN109611214A (en) * | 2018-11-07 | 2019-04-12 | 中国人民解放军空军工程大学 | Swipe plasma jet igniter |
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