CN105114337A - Device and method for synchronous accurate measurement of transient flow field of vane pump - Google Patents
Device and method for synchronous accurate measurement of transient flow field of vane pump Download PDFInfo
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- CN105114337A CN105114337A CN201510577513.3A CN201510577513A CN105114337A CN 105114337 A CN105114337 A CN 105114337A CN 201510577513 A CN201510577513 A CN 201510577513A CN 105114337 A CN105114337 A CN 105114337A
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Abstract
The invention provides a device and a method for the synchronous accurate measurement of the transient flow field of a vane pump. The device comprises a test device system, a variable rotating speed work condition rotating shaft phase locking device and a PIV measurement system, wherein the test device system comprises a motor, a model pump, a pipeline system and a pressure stabilizing tank; the rear end of a motor shaft of the motor is connected with the model pump; the model pump is connected with the pressure stabilizing tank through the pipeline system; the variable rotating speed work condition rotating shaft phase locking device comprises a point light source laser, a moving disc and a point laser receiver; a plurality of round holes are formed in the circumferential outer edge of the moving disc; the moving disc is perpendicular to the motor shaft and fixed to the front end of the motor shaft; the point light source laser is positioned on the outer side of the moving disc, the laser receiver is positioned on the inner side of the moving disc, and the point light source laser and the laser receiver are positioned on the same horizontal line; and the PIV measurement system is connected with the variable rotating speed work condition rotating shaft phase locking device. The device can accurately measure and output the rotating speed parameters of the vane pump in the starting and stopping process of the vane pump and realize the data collection of the same phase transient flow field at different rotating speeds.
Description
Technical field
The invention belongs to the inner transient flow characteristics field of fluid machinery (pump), especially relate to the synchronous device for accurately measuring of a kind of vane pump transient flow field and method.
Background technique
Vane pump starts, stopping process as the special transient process of a class, can be special application and instance fluid power be provided, such as the occasion such as arm discharge, naval vessel hydraulic jet propulsion.Because transient state startup, stopping process make the rotating speed of vane pump that very large change occurs in a short period of time; flowing between impeller channel presents rotational acceleration complex state jumpy; characteristic Reynold's number rapidly increases to up to a million from zero; pump internal flow changes rapidly complicated three-dimensional unsteady flow turbulent flowing into from laminar condition; not only along with the physical phenomenon that water attack, Secondary Flow, cavitation, stator-rotor interaction etc. are complicated; and along with strong noise and vibration, time serious, even cause the failure of start.Therefore, grasp that vane pump starts, the physical arrangement of stopping process transient flow field and evolutionary process destroy the harm of pump-unit and pipe-line system significant to suppressing waterpower exciting, impact load and the cavitation started, stopping process transient effect expedites the emergence of.At present, PIV (ParticleImageVelocity) i.e. Particle Image Velocimetry has been widely used in the internal flow measurement of vane pump, and the PIV surveying of steady-state speed lower blade pump interior flow field is quite ripe, application number be 201220175767.4 utility model patent " centrifugal pump PIV trial position phase-locking device " solve location, cophasing flow field and shooting when rotating speed reaches the steady-state speed of setting, the precondition realizing the method is the rotating speed of vane pump is known, constant, but vane pump is started, the transient flow field PIV of stopping process measures exists some problems, first initial flow-field phase place is bad determines, shaft encoder initial phase and laser triggering can not be solved and take phase difference problem between phase place, make to start initial flow-field (less than a week) measurement to be difficult to control, rotation 350 ° of circumference shaft encoder initial phases may be needed after startup could to take phase coincidence with laser triggering, also after may rotating 10 ° of circumference, shaft encoder initial phase takes phase coincidence with laser triggering, this will cause larger measurement error, secondly can not export vane pump rotary speed parameter in real time, time, rotating speed can not be shut away mutually with transient flow field data.Therefore, being cophasing flow field data and obtaining rotary speed data to be in real time the key that transient flow field is accurately successfully tested from starting to accelerating process test data under different rotating speeds how is guaranteed.Though have the function of flow field real-time data acquisition in current a part of prior art, do not realize the data acquisition function of cophasing transient flow field under different rotating speeds.
Summary of the invention
For Shortcomings in prior art; the invention provides the synchronous device for accurately measuring of a kind of vane pump transient flow field and method; catch the evolution Feature of vane pump startup, stopping process transient flow field; solve shutdown process initial phase flow field to be difficult to Measurement accuracy, the problems such as vane pump rotary speed parameter can not to be exported in real time, realize the parameter acquisition in cophasing flow field under different rotating speeds.
The present invention realizes above-mentioned technical purpose by following technological means.
The synchronous device for accurately measuring of a kind of vane pump transient flow field, comprises test equipment system, variable rotate speed rotating shaft phase locking system and PIV measuring system;
Described test equipment system comprises motor, model pump, pipe-line system and surge tank; The motor shaft rear end link model pump of described motor; Described model pump connects surge tank by pipe-line system and jointly forms circulation waterway;
Described variable rotate speed rotating shaft phase locking system comprises point source of light laser, dynamic disk and laser pickoff; The circumferential outer edge of described dynamic disk is distributed with multiple circular hole; Described dynamic disk is perpendicular to motor shaft and be fixed on the front end of motor shaft; Described point source of light laser is positioned at the outside of dynamic disk, for launching the laser beam being parallel to motor shaft; Described laser pickoff is positioned at the inner side of dynamic disk, synchronously triggers and rotating speed output unit to transient flow field for the laser beam received being converted to output of pulse signal; Described point source of light laser and laser pickoff are in the same horizontal line;
Described PIV measuring system comprises computer, CCD camera, surface light source laser and transient flow field and synchronously triggers and rotating speed output unit; Described computer, CCD camera and transient flow field synchronously trigger and rotating speed output unit three is connected to each other; Described point source of light laser, laser pickoff and surface light source laser all synchronously trigger with transient flow field and rotating speed output unit is connected; Described transient flow field synchronously trigger and rotating speed output unit for trigger point light source laser and surface light source laser Emission Lasers, the pulse signal sent by laser pickoff is passed to computer; Described computer, for calculating pulse signal, the transient rotative speed exporting vane pump and time, controls CCD camera synchronous acquisition transient flow field information simultaneously, and is exported by information of flow.
Preferably, the circumferential outer edge of described dynamic disk is evenly distributed with multiple circular hole.
Preferably, described dynamic disk is connected with motor shaft by flat key.
The synchronous accurate measurement method of a kind of vane pump transient flow field, comprises following steps:
S1: described dynamic disk is vertically fixed on motor shaft one end and rotates with motor shaft; Computer control transient flow field synchronously triggers and rotating speed output unit trigger point light source laser launches the laser beam being parallel to motor shaft, and laser beam is received by laser pickoff through optical signal after the circular hole of dynamic disk outer rim;
S2: the optical signal received is converted to pulse signal and is synchronously triggered by transient flow field and this pulse signal is passed to computer by rotating speed output unit by laser pickoff; Computer calculate also exports transient rotative speed and the time of vane pump;
S3: when the number of pulses that computer receives reaches setting value D, computer control transient flow field synchronously triggers and rotating speed output unit triggers surface light source laser Emission Lasers; Meanwhile, computer control CCD camera synchronous acquisition transient flow field information;
S4:CCD collected by camera to information of flow exported by computer display, realize cophasing instantaneous flow field under different rotating speeds and measure.
Preferably, the transient rotative speed formula of the vane pump of computer calculate described in step S2 is: transient speed n
t=60 × z/ (N × T), wherein, z is the number of pulses comprised in a time of day, gets 1≤z≤3; T is time of day, and unit is s; N is the circular hole number of disk circumference outer rim.
Preferably, setting value D described in step S3 is: D=i+j × N, i < N, j=0,1,2,3...n; Wherein i is the number that initial phase computer-chronograph receives pulse signal; N is the circular hole number of disk circumference outer rim, and n is natural number.
Beneficial effect of the present invention:
The synchronous device for accurately measuring of a kind of vane pump transient flow field of the present invention and method, by the dynamic disk both sides layout points light source laser that is vertically fixedly installed in motor shaft front end and laser pickoff, form variable rotate speed rotating shaft phase locking system thus, and this device is connected PIV measuring system, achieve the Measurement accuracy in the transient state cophasing flow field at arbitrary phase angle under the accurate location of flow field initial phase and startup or outage state, thus the parameter acquisition in cophasing flow field under obtaining different rotating speeds; In addition, measuring accuracy is higher more at most to move circular hole quantity on disk.
Accompanying drawing explanation
Fig. 1 is the structural representation of the synchronous device for accurately measuring of vane pump transient flow field of the present invention.
Fig. 2 is the structural representation of variable rotate speed rotating shaft phase locking system of the present invention.
Fig. 3 is dynamic disc structure schematic diagram of the present invention.
Description of reference numerals is as follows:
1-motor shaft, 2-point source of light laser, 3-moves disk, 4-laser pickoff, 5-motor, 6-model pump, 7-pipe-line system, 8-surge tank, 9-computer, 10-CCD camera, 11-surface light source laser, and 12-transient flow field synchronously triggers and rotating speed output unit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
As shown in Figure 1, the synchronous device for accurately measuring of a kind of vane pump transient flow field, comprises test equipment system, variable rotate speed rotating shaft phase locking system and PIV measuring system; Described variable rotate speed rotating shaft phase locking system is connected with test equipment system, is connected respectively again, realizes transient flow field data capture by PIV measuring system with PIV measuring system.
Described test equipment system comprises motor 5, model pump 6, pipe-line system 7 and surge tank 8; The motor shaft 1 rear end link model pump 6 of described motor 5; Described model pump 6 connects surge tank 8 by pipe-line system 7 and jointly forms circulation waterway; Motor 5 has frequency control of motor speed function and works for driving model pump 6.
As shown in Figure 2, described variable rotate speed rotating shaft phase locking system comprises point source of light laser 2, dynamic disk 3 and laser pickoff 4; As shown in Figure 3, the circumferential outer edge of described dynamic disk 3 is evenly distributed with N number of circular hole; Described dynamic disk 3 is perpendicular to motor shaft 1 and be fixed on the front end of motor shaft 1 by flat key; Described point source of light laser 2 is positioned at the outside of dynamic disk 3, for launching the laser beam being parallel to motor shaft 1; Described laser pickoff 4 is positioned at the inner side of dynamic disk 3, for the laser through circular hole that acceptance point light source laser 2 is launched; Described point source of light laser 2 and laser pickoff 4 are in the same horizontal line.
Described PIV measuring system comprises computer 9, CCD camera 10, surface light source laser 11 and transient flow field and synchronously triggers and rotating speed output unit 12; Described computer 9, CCD camera 10 and transient flow field synchronously trigger and rotating speed output unit 12 three is connected to each other; Described point source of light laser 2, laser pickoff 4 and surface light source laser 11 all synchronously trigger with transient flow field and rotating speed output unit 12 is connected; Described transient flow field synchronously triggers and rotating speed output unit 12 respectively trigger point light source laser 2 and surface light source laser 11 Emission Lasers, and laser pickoff 4 is received pulse signal be passed to computer 9; Described computer 9, for calculating pulse signal, the transient rotative speed exporting vane pump and time, controls CCD camera 10 synchronous acquisition transient flow field information simultaneously, and is exported by information of flow; Described CCD camera 10 is for being passed to computer 9 by the information of flow of collection.
The synchronous accurate measurement method of a kind of vane pump transient flow field, comprises following steps:
S1: described dynamic disk 3 is vertically fixed on motor shaft 1 one end and rotates with motor shaft 1; Computer 9 controls transient flow field and synchronously to trigger and rotating speed output unit 12 trigger point light source laser 2 is launched and is parallel to the laser beam of motor shaft 1, and laser beam is received by laser pickoff 4 through optical signal after the circular hole of dynamic disk 3 outer rim;
S2: the optical signal received is converted to output of pulse signal and synchronously triggers and rotating speed output unit 12 to transient flow field by laser pickoff 4, computer 9 receives the pulse signal that transient flow field synchronously triggers and rotating speed output unit 12 transmits, and calculates and exports transient rotative speed and the time of vane pump;
Transient rotative speed is revolution speed when exporting synchronizable optical signal, and in order to Measurement accuracy, suppose that T is time of day, unit is s; Z is the number of pulses comprised in a time of day, gets 1≤z≤3; The circular hole number of dynamic disk 3 circumferential outer edge is N, then transient speed n
t=60 × z/ (N × T).About transient rotative speed, derivation formula is as follows: 1. every pulse used time t
m=T/z, t when 2. often converting
z=t
m× N, 3. transient speed n
t=60/t
z=60 × z/ (N × T).To should time of transient rotative speed be relative time, for exporting the time lag (being accurate to millisecond) between first synchronization pulse to current sync pulse.
S3: when the number of pulses that computer 9 receives reaches setting value D, computer 9 controls transient flow field and synchronously to trigger and rotating speed output unit 12 triggers surface light source laser 11 Emission Lasers; Meanwhile, computer 9 controls CCD camera 10 synchronous acquisition transient flow field information;
Wherein said setting value D is: D=i+j × N, i < N, j=0,1,2,3...n; Wherein i is the number that initial phase computer-chronograph 9 receives pulse signal; N is the circular hole number of disk 3 circumferential outer edge, and n is natural number.
The information of flow that S4:CCD camera 10 collects is exported by computer 9 display screen, obtains the prompting message in cophasing flow field under different rotating speeds thus; On dynamic disk 3, that to survey the less then measuring accuracy in unit of phase angle higher is more for circular hole quantity.
Described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned mode of execution; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (6)
1. the synchronous device for accurately measuring of vane pump transient flow field, is characterized in that, comprises test equipment system, variable rotate speed rotating shaft phase locking system and PIV measuring system;
Described test equipment system comprises motor (5), model pump (6), pipe-line system (7) and surge tank (8); Motor shaft (1) rear end link model pump (6) of described motor (5); Described model pump (6) connects surge tank (8) by pipe-line system (7) and jointly forms circulation waterway;
Described variable rotate speed rotating shaft phase locking system comprises point source of light laser (2), dynamic disk (3) and laser pickoff (4); The circumferential outer edge of described dynamic disk (3) is distributed with multiple circular hole; Described dynamic disk (3) is perpendicular to motor shaft (1) and be fixed on the front end of motor shaft (1); Described point source of light laser (2) is positioned at the outside of dynamic disk (3), for launching the laser beam being parallel to motor shaft (1); Described laser pickoff (4) is positioned at the inner side of dynamic disk (3), synchronously triggers and rotating speed output unit (12) to transient flow field for the laser beam received being converted to output of pulse signal; Described point source of light laser (2) and laser pickoff (4) are in the same horizontal line;
Described PIV measuring system comprises computer (9), CCD camera (10), surface light source laser (11) and transient flow field synchronously triggers and rotating speed output unit (12); Described computer (9), CCD camera (10) and transient flow field synchronously triggers and rotating speed output unit (12) three is connected to each other; Described point source of light laser (2), laser pickoff (4) and surface light source laser (11) all synchronously trigger with transient flow field and rotating speed output unit (12) is connected; Described transient flow field synchronously trigger and rotating speed output unit (12) for trigger point light source laser (2) and surface light source laser (11) Emission Lasers, the pulse signal that laser pickoff (4) sends is passed to computer (9); Described computer (9), for calculating pulse signal, the transient rotative speed exporting vane pump and time, controls CCD camera (10) synchronous acquisition transient flow field information simultaneously, and is exported by information of flow.
2. the synchronous device for accurately measuring of a kind of vane pump transient flow field according to claim 1, is characterized in that, the circumferential outer edge of described dynamic disk (3) is evenly distributed with multiple circular hole.
3. the synchronous device for accurately measuring of a kind of vane pump transient flow field according to claim 1, is characterized in that, described dynamic disk (3) is connected with motor shaft (1) by flat key.
4. the synchronous accurate measurement method of vane pump transient flow field, is characterized in that, comprise following steps:
S1: described dynamic disk (3) is vertically fixed on motor shaft (1) one end and rotates with motor shaft (1); Computer (9) control transient flow field synchronously triggers and the laser beam being parallel to motor shaft (1) is launched in rotating speed output unit (12) trigger point light source laser (2), and laser beam is received by laser pickoff (4) through optical signal after the circular hole of dynamic disk (3) outer rim;
S2: the optical signal received is converted to pulse signal and is synchronously triggered by transient flow field and this pulse signal is passed to computer (9) by rotating speed output unit (12) by laser pickoff (4); Computer (9) calculates and exports transient rotative speed and the time of vane pump;
S3: when the number of pulses that computer (9) receives reaches setting value D, computer (9) controls transient flow field and synchronously triggers and rotating speed output unit (12) triggering surface light source laser (11) Emission Lasers; Meanwhile, computer (9) controls CCD camera (10) synchronous acquisition transient flow field information;
The information of flow that S4:CCD camera (10) collects is exported by computer (9) display screen, and under realizing different rotating speeds, cophasing instantaneous flow field is measured.
5. the synchronous accurate measurement method of a kind of vane pump transient flow field according to claim 4, it is characterized in that, the transient rotative speed formula that computer described in step S2 (9) calculates vane pump is: transient speed nt=60 × z/ (N × T), wherein, z is the number of pulses comprised in a time of day, gets 1≤z≤3; T is time of day, and unit is s; N is the circular hole number of dynamic disk (3) circumferential outer edge.
6. the synchronous accurate measurement method of a kind of vane pump transient flow field according to claim 4, it is characterized in that, setting value D described in step S3 is: D=i+j × N, i < N, j=0,1,2,3...n; Wherein i is the number that initial phase computer-chronograph (9) receives pulse signal; N is the circular hole number of dynamic disk (3) circumferential outer edge, and n is natural number.
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