CN114321976B - Bidirectional staggered injection double-channel torsion cyclone - Google Patents
Bidirectional staggered injection double-channel torsion cyclone Download PDFInfo
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- CN114321976B CN114321976B CN202111518247.9A CN202111518247A CN114321976B CN 114321976 B CN114321976 B CN 114321976B CN 202111518247 A CN202111518247 A CN 202111518247A CN 114321976 B CN114321976 B CN 114321976B
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Abstract
The invention belongs to the technical field of swirlers, and particularly relates to a bidirectional staggered-injection double-channel torsion swirler. According to the invention, the fuel holes are uniformly distributed on two sides of the swirler vane, so that the fuel in the swirl groove can be injected in two directions, and the fuel holes are distributed in a staggered manner, so that the mixing area of the fuel and air is increased. The invention adopts double-channel double-torsion, the two swirl grooves are respectively designed to be circumferentially widened and circumferentially narrowed, so that the cross flow between mixed gas flowing out of the adjacent swirl grooves is realized, the turbulence pulsation is enhanced, and the secondary mixing between the mixed gas and the mixed gas is formed. The swirler has compact structure, can enhance the mixing of air and fuel and increase the mixing of mixed gas, thereby forming fully and uniformly mixed combustible mixed gas, realizing the beneficial technical effects of stable combustion and inhibiting combustion oscillation, obtaining ultralow emission and having large-scale popularization and application values.
Description
Technical Field
The invention belongs to the technical field of cyclones, and particularly relates to a bidirectional staggered-injection double-channel torsion cyclone.
Background
In recent years, the problem of environmental pollution in the world is becoming more severe, and governments of various countries make increasingly strict pollutant emission standards, so that the requirement of the market on the emission of gas turbines is further improved. The main means for reducing the NOx emission of the gas turbine is to form stable combustion by uniformly mixing fuel and air and reduce combustion oscillation, so that the emission of pollutants of the gas turbine is limited. Gas turbine NO x The generation situation is extremely sensitive to the blending uniformity of fuel and air, so the research on the blending uniformity of fuel and air has important application value
Swirlers may be provided to promote mixing between fuel and air, an integral component of a gas turbine combustor, and the design of swirlers plays an extremely important role for gas turbine emissions. However, the current swirlers are all designed into swirling grooves with a single structure, and the injection direction of fuel in each swirling groove is a single direction, under the current swirler structure, fuel and air only impact the fuel in a single direction by virtue of air so as to achieve the purpose of promoting mixing, and the propagation directions of the fuel and air mixtures propagating through adjacent swirling grooves are the same, so that the mixtures cannot be mixed again in a combustion chamber, and the mixing effect of the fuel and the air cannot meet the requirement of a low-emission gas turbine. And the times of collision and mixing of fuel and air in the swirler can be increased by adopting a flow field organization technology of changing a fuel injection mode and changing the propagation direction of mixed gas flowing out of adjacent swirl grooves of the swirler, so that the aim of mixing enhancement is fulfilled, and finally ultralow emission is realized. In view of the above, a need exists for a swirler structure with more reasonable fuel injection and mixture propagation.
Disclosure of Invention
The invention aims to provide a bidirectional staggered injection double-channel torsion swirler which can enhance the mixing effect of fuel and air and realize the full and uniform mixing and ultralow emission of the fuel and the air.
A bidirectional staggered-injection double-channel torsion cyclone comprises a cyclone outer ring and a cyclone inner ring, wherein two cyclone blades are arranged between the cyclone outer ring and the cyclone inner ring, and are arranged alternately, and the space between the cyclone outer ring and the cyclone inner ring is divided into two structures of cyclone grooves which are respectively an arch-shaped cyclone groove and a T-shaped cyclone groove; two sides of the two types of cyclone vanes are both provided with a plurality of fuel holes, and the fuel holes in the same cyclone groove are arranged in a staggered manner.
Furthermore, the arch-shaped swirl groove and the T-shaped swirl groove are both designed in a twisting mode, and the mixed gas of fuel and air is guaranteed to have large rotation angular momentum after passing through any one swirl groove.
Furthermore, the outer ring of the cyclone adopts a tapered design, namely the area of an outlet is smaller than that of an inlet; the inner ring of the cyclone adopts a gradually expanding design; the arch-shaped swirl groove and the T-shaped swirl groove are both in a tapered shape.
Furthermore, the outlet areas of the arch-shaped swirl slots and the T-shaped swirl slots are smaller than the inlet areas; the circumferential distance of the outlet of the arch-shaped rotational flow groove is designed to be narrower than the circumferential distance of the inlet of the arch-shaped rotational flow groove; the circumferential distance of the outlet of the T-shaped rotational flow groove is designed to be wider than the circumferential distance of the inlet of the T-shaped rotational flow groove.
The invention has the beneficial effects that:
according to the invention, the fuel holes are uniformly distributed on two sides of the swirler vane, so that the fuel in the swirl groove can be injected in two directions, and the fuel holes are distributed in a staggered manner, so that the mixing area of the fuel and air is increased. The invention adopts double-channel double-torsion, the two swirl grooves are respectively designed to be circumferentially widened and circumferentially narrowed, so that the cross flow between mixed gas flowing out of the adjacent swirl grooves is realized, the turbulence pulsation is enhanced, and the secondary mixing between the mixed gas and the mixed gas is formed. The swirler has compact structure, can enhance the mixing of air and fuel and increase the mixing of mixed gas, thereby forming fully and uniformly mixed combustible mixed gas, realizing the beneficial technical effects of stable combustion and inhibiting combustion oscillation, obtaining ultralow emission and having large-scale popularization and application values.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Figure 2 is a schematic view of the inlet of a cyclone according to the invention.
Figure 3 is a schematic view of the outlet of a cyclone according to the invention.
Fig. 4 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 2.
Fig. 5 is a sectional view B-B of fig. 4.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a swirler, in particular to a bidirectional staggered-injection double-channel torsion swirler, belonging to the field of heat energy and power engineering.
The invention aims to realize full and uniform mixing of fuel and air so as to obtain ultralow emission, and provides a bidirectional staggered injection double-channel torsional swirler which adopts fuel opposite-jet and different adjacent swirl groove structures. The swirler can enhance the mixing effect of fuel and air, realize the full and uniform mixing and ultralow emission of the fuel and the air, and has large-scale popularization and application values.
Example 1:
referring to fig. 1-5, the present invention mainly comprises a swirler outer ring 1, swirler vanes 2, a swirler inner ring 3, an arch-shaped swirl groove 4, a T-shaped swirl groove 5, arch-shaped swirl groove left side fuel holes 6, arch-shaped swirl groove right side fuel holes 7, T-shaped swirl groove left side fuel holes 8, T-shaped swirl groove right side fuel holes 9, a fuel inlet 10, etc.; two kinds of swirler vanes 2 are arranged between a swirler outer ring 1 and a swirler inner ring 3, the two kinds of swirler vanes 2 are arranged alternately and divide the space between the swirler outer ring 1 and the swirler inner ring 3 into two kinds of swirl slots with two structures, namely an arch-shaped swirl slot 4 and a T-shaped swirl slot 5; two sides of the two types of swirler vanes 2 are both provided with a plurality of fuel holes, and the fuel holes in the same swirler groove are arranged in a staggered manner.
The two sides of each swirler vane are provided with a plurality of fuel holes, so that the bidirectional injection of fuel in the swirl grooves formed between adjacent swirler vanes is realized, the turbulence pulsation in the swirl grooves is enhanced, and the aim of promoting the mixing of the fuel and air is fulfilled; and the fuel holes at the two sides of the swirl flow groove are arranged in a staggered manner, so that a sufficient contact area is reserved for fuel and air, and the mixing effect of the fuel and the air can be enhanced.
Example 2:
furthermore, the arch-shaped swirl grooves 4 and the T-shaped swirl grooves 5 are designed in a twisting mode, so that the mixed gas of fuel and air has large rotational angular momentum after passing through any one swirl groove.
Because the swirler is designed into double channels and double twists, the mixed gas of fuel and air has larger rotation angular momentum after passing through any swirl groove, thereby promoting the generation of swirl flow, forming a heat reflux area and ensuring the stability of flame.
Example 3:
furthermore, the outer ring 1 of the cyclone adopts a tapered design, namely the area of an outlet is smaller than that of an inlet; the inner ring 3 of the cyclone adopts a divergent design; the arch-shaped swirl groove 4 and the T-shaped swirl groove 5 are both in a gradually-reduced type.
Because the outer ring 1 of the cyclone adopts a tapered design, the jet speed of the mixed gas at the outlet of the cyclone is accelerated, the rotary jet with longer span is formed, a larger swirl number is obtained, the swirl flow is strengthened, and a low-pressure area is formed. After the flame passes through the central through hole of the swirler, because the inner ring 3 of the swirler adopts the gradually-expanding design, the flame is diffused and spread to the periphery, and under the combined action of double channels, double torsion and the reduction of the outer diameter of the swirler, the aim of generating strong swirl flow at the outlet of the swirler is achieved, and finally a hot reflux area is formed, so that the stability of the flame is ensured.
Example 4:
furthermore, the outlet areas of the arch-shaped swirl slots 4 and the T-shaped swirl slots 5 are smaller than the inlet areas; the circumferential distance of the outlet 4-2 of the arch-shaped swirl groove is designed to be narrower than the circumferential distance of the inlet 4-1 of the arch-shaped swirl groove; the circumferential distance of the T-shaped cyclone groove outlet 5-2 is designed to be wider than the circumferential distance of the T-shaped cyclone groove inlet 5-1.
Referring to fig. 2 and 3, air enters the swirler through the inlet 4-1 of the arch-shaped swirl groove and the inlet 5-1 of the T-shaped swirl groove, is mixed with fuel in the swirl groove, and finally mixed gas of the fuel and the air enters the combustion chamber through the outlet 4-2 of the arch-shaped swirl groove and the outlet 5-2 of the T-shaped swirl groove. The exit area in two whirl grooves all is less than the entry area, can accelerate the efflux speed of air, forms high-speed efflux air, has strengthened the relative motion between air current and fuel to promote the rotation angular momentum and the axial momentum of mixing the gas after through the swirler, increase the whirl number, promote air and fuel mixing effect. Further, the circumferential distance of the outlet 4-2 of the arcuate swirl groove is designed to be narrower than the circumferential distance of the inlet 4-1 of the arcuate swirl groove. In contrast, the circumferential distance of the T-shaped swirling flow groove outlet 5-2 is designed to be wider than the circumferential distance of the T-shaped swirling flow groove inlet 5-1. The mixed gas is propagated into the combustion chamber after passing through the two swirl grooves and meets at the outlet of the swirler, and because the swirl numbers of the mixed gas flowing out of the adjacent swirl grooves are different, the mixed gas propagated by the adjacent swirl grooves has larger speed difference, so that the cross flow between the mixed gas is obtained, the turbulence pulsation is enhanced, the secondary mixing between the mixed gas and the mixed gas is formed, and the mixing effect of the air and the fuel is strengthened again. Finally, the beneficial technical effects of fully and uniformly mixing air and fuel, maintaining flame stability, keeping lower flame temperature, improving the combustion efficiency of the fuel and inhibiting combustion oscillation are realized, so that NO is reduced x And (5) discharging.
As can be seen from fig. 5, the left side and the right side of the arch-shaped swirl groove 4 are respectively provided with a plurality of fuel outlet holes, an arch-shaped swirl groove left side fuel hole 6 and an arch-shaped swirl groove right side fuel hole 7, and the arch-shaped swirl groove left side fuel hole 6 and the arch-shaped swirl groove right side fuel hole 7 are arranged in a staggered manner; similarly, the left side and the right side of the T-shaped swirl slot 5 are provided with a plurality of fuel outlet holes, and the left fuel hole 8 of the T-shaped swirl slot, the right fuel hole 9,T of the T-shaped swirl slot, the left fuel hole 8 of the T-shaped swirl slot and the right fuel hole 9 of the T-shaped swirl slot are also arranged in a staggered manner. Fuel enters through a fuel inlet 10, as in conventional swirlers, where fuel through slots are formed in the swirler vanes through which fuel flows to a fuel outlet on the swirler vanes. However, the invention has the advantages that the swirler realizes the fuel bidirectional injection in any swirl groove, and the fuel injection depth is ensured by the staggered arrangement of the fuel holes. The fuel which is injected in any one swirl groove in a staggered mode collides with the air of the axial heat flow, and the fuel and the air spread in multiple directions, so that great turbulence pulsation is brought, and the air and the fuel can be fully mixed. In addition, the fuel jet depth is guaranteed by the fuel staggered injection mode, the contact area of the fuel and the air is increased, and the mixing effect can be enhanced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a two-way staggered jet binary channels twists reverse swirler which characterized in that: the cyclone comprises a cyclone outer ring (1) and a cyclone inner ring (3), wherein two kinds of cyclone blades (2) are arranged between the cyclone outer ring (1) and the cyclone inner ring (3), the two kinds of cyclone blades (2) are arranged at intervals and divide the space between the cyclone outer ring (1) and the cyclone inner ring (3) into cyclone grooves with two structures, namely an arch-shaped cyclone groove (4) and a T-shaped cyclone groove (5); both sides of the two swirler vanes (2) are provided with a plurality of fuel holes, and the fuel holes in the same swirler groove are arranged in a staggered manner; the outer ring (1) of the cyclone adopts a tapered design, namely the area of an outlet is smaller than that of an inlet; the cyclone inner ring (3) adopts a gradually expanding design; the arch-shaped swirl groove (4) and the T-shaped swirl groove (5) are both in a tapered shape; the outlet areas of the arch-shaped swirl groove (4) and the T-shaped swirl groove (5) are smaller than the inlet areas; the circumferential distance of the outlet (4-2) of the arch-shaped rotational flow groove is designed to be narrower than the circumferential distance of the inlet (4-1) of the arch-shaped rotational flow groove; the circumferential distance of the T-shaped cyclone groove outlet (5-2) is designed to be wider than that of the T-shaped cyclone groove inlet (5-1).
2. The dual staggered jet dual passage torsional swirler of claim 1, wherein: the arch-shaped swirl groove (4) and the T-shaped swirl groove (5) both adopt a twisting design, and the mixed gas of fuel and air is ensured to have larger rotary angular momentum after passing through any swirl groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518247.9A CN114321976B (en) | 2021-12-13 | 2021-12-13 | Bidirectional staggered injection double-channel torsion cyclone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518247.9A CN114321976B (en) | 2021-12-13 | 2021-12-13 | Bidirectional staggered injection double-channel torsion cyclone |
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| CN114321976A CN114321976A (en) | 2022-04-12 |
| CN114321976B true CN114321976B (en) | 2023-03-21 |
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| CN115288851A (en) * | 2022-07-20 | 2022-11-04 | 西安航天动力研究所 | Precooling engine combustion chamber gas/gas mixing combustion cyclone device and method |
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| US8528337B2 (en) * | 2008-01-22 | 2013-09-10 | General Electric Company | Lobe nozzles for fuel and air injection |
| CN106016358B (en) * | 2016-05-30 | 2019-04-30 | 中国科学院工程热物理研究所 | A kind of cyclone having both eddy flow, injection and blending effect |
| CN108716694A (en) * | 2018-06-06 | 2018-10-30 | 西北工业大学 | A kind of poor premixed swirl nozzle of low pollution combustor and loopful combustion chamber |
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