CN113325195A - Endoscopic PIV (particle image velocimetry) testing device for measuring axial flow velocity field of water pump - Google Patents
Endoscopic PIV (particle image velocimetry) testing device for measuring axial flow velocity field of water pump Download PDFInfo
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- CN113325195A CN113325195A CN202110761456.XA CN202110761456A CN113325195A CN 113325195 A CN113325195 A CN 113325195A CN 202110761456 A CN202110761456 A CN 202110761456A CN 113325195 A CN113325195 A CN 113325195A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/001—Full-field flow measurement, e.g. determining flow velocity and direction in a whole region at the same time, flow visualisation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to an endoscopic PIV testing device for a water pump axial flow velocity field test, which is characterized by comprising a testing shell module and an endoscope system, wherein the testing shell module comprises a pump impeller sleeve, a base and a sealing mechanism, and the endoscope system comprises a camera module and a sheet light source module. On the basis of a water pump opaque impeller sleeve, an endoscope system is guided into the impeller sleeve by welding a phi 38 base, drilling a phi 10 through hole and assembling a sealing mechanism, and is combined with a camera and a sheet light source for PIV test to directly measure the axial speed field of the pump. After the invention is applied, the PIV axial flow velocity field test of the water pump does not need to reprocess the full transparent impeller sleeve, additionally arrange an optical distortion prevention auxiliary device and carry out optical distortion correction on the shot image, thereby reducing the test cost, simplifying the test process, improving the PIV test precision and realizing the non-contact direct measurement of the pump axial flow velocity field.
Description
Technical Field
The invention relates to an endoscopic PIV test device for measuring an axial flow velocity field, and belongs to the technical field of tests of water pumps.
Background
Particle Image Velocimetry (PIV) method is widely used in fluid mechanical internal flow field test as a non-contact global instantaneous flow field measurement technology. The impeller sleeve of the water pump is an opaque circular thin-wall shell, a PIV internal flow field test needs to be carried out by reworking the impeller sleeve by using a fully transparent material, in addition, in order to avoid optical distortion existing in an actual view field, an auxiliary device for preventing the optical distortion needs to be additionally arranged outside a perspective surface, and the same optical physical medium is filled in the auxiliary device.
In order to simplify the testing device, researchers adopt a full-transparent organic glass structure with an inner circle and an outer square as an impeller sleeve for the PIV test, but the impeller sleeve is increased in thickness, improved in weight, special in inlet and outlet connection mode, high in processing cost and still has certain optical distortion, and only can be used for carrying out later-stage correction and optimization on an image through software and a corresponding algorithm. Researchers have also proposed using computer technology to directly correct optical distortion in the field of view of the impeller sleeve itself, which is made of any transparent material and curved surface shape, but the process is complicated and the effect is not ideal.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the traditional testing device for the PIV internal flow field test is complicated in structure and high in cost.
In order to solve the technical problem, the technical scheme of the invention is to provide an endoscopic PIV testing device for a water pump axial flow velocity field test, which is characterized by comprising a testing shell module and an endoscope system, wherein the testing shell module comprises a pump impeller sleeve, a base and a sealing mechanism, and the endoscope system comprises a camera module and a sheet light source module;
the method comprises the following steps of (1) arranging N vertical through holes communicated with an inner cavity of a pump impeller sleeve on the pump impeller sleeve along a horizontal position, arranging N horizontal through holes communicated with the inner cavity of the pump impeller sleeve on the pump impeller sleeve along a central normal position of a flow velocity field to be measured, wherein N is more than or equal to 2, the nth vertical through hole is adjacent to the nth horizontal through hole in the circumferential direction, and N is 1, … and N; the base comprises N horizontal bases and N vertical bases, and the sealing mechanism comprises a horizontal sealing mechanism and a vertical sealing mechanism; the N horizontal sealing mechanisms are respectively installed at the N horizontal through holes through the N horizontal bases, and the N vertical sealing mechanisms are respectively installed at the N vertical through holes through the N vertical bases; the state of the horizontal sealing mechanism is switched between an opening state and a sealing state: a sheet light source module of the endoscope system penetrates into a pump impeller sleeve through a horizontal sealing mechanism in an open state, so that an emitting end of the sheet light source module is positioned in an inner cavity of the pump impeller sleeve, and light is emitted into a detected area in parallel; the horizontal sealing mechanism in a sealing state seals the corresponding horizontal through hole, or the horizontal sealing mechanism in a sealing state seals the corresponding horizontal through hole, so that the sheet light source module penetrating through the horizontal through hole is in sealing fit with the horizontal sealing mechanism; the state of the vertical sealing mechanism is switched between an opening state and a sealing state: a camera module of the endoscope system penetrates into the pump impeller sleeve through the vertical sealing mechanism in an open state, so that an objective lens end of the camera module is positioned in an inner cavity of the pump impeller sleeve, and an image of a measured area is obtained; the vertical sealing mechanism in the sealing state seals the corresponding vertical through hole, or the vertical sealing mechanism in the sealing state seals the corresponding vertical through hole, so that the camera module penetrating through the vertical sealing mechanism is in sealing fit with the vertical sealing mechanism.
Preferably, if N is 3, the water pump guide vane inlet axial flow velocity field measurement is completed by using the sheet light source module guided through the 1 st horizontal base and the horizontal sealing mechanism thereon and matching with the camera module guided through the 1 st vertical base and the vertical sealing mechanism thereon; and the static and dynamic distance and impeller outlet axial flow velocity field measurement is completed by utilizing the sheet light source module led in through the 2 nd to 3 rd horizontal bases and the horizontal sealing mechanisms on the horizontal bases to match with the camera module led in through the 2 nd to 3 rd vertical bases and the vertical sealing mechanisms on the vertical bases.
Preferably, the objective end of the camera module and the emitting end of the sheet light source module are flush with the inner diameter of the pump impeller sleeve after being guided into the pump impeller sleeve.
Preferably, the sealing mechanism includes a sealing end cover and a plug, wherein: the end cover middle part is formed with the trompil, end cover with horizontal base or the sealed cooperation of vertical base, end cover's trompil department is equipped with, and the state of end cap can open the state with switch between the encapsulated situation, the top and the end cover of end cap sealed cooperation, the bottom surface of end cap is the cambered surface that the radius is 150mm, the chamber wall of pump impeller sleeve pipe inner chamber is the diameter and is 300 mm's disc, the bottom surface of end cap with the chamber wall of pump impeller sleeve pipe inner chamber links up the fairing.
Preferably, the test device further comprises a mounting module separated from the test housing module, and the camera module and the sheet light source module are fixed on the mounting module.
Preferably, the installation module comprises a camera guide rail truss, a light source guide rail truss, a fixed frame and an installation sliding block, the camera guide rail truss and the light source guide rail truss are arranged on the fixed frame, the camera guide rail truss and the light source guide rail truss are respectively provided with a movable installation sliding block, the camera module is fixedly connected with the installation sliding block arranged on the camera guide rail truss, the light source module is fixedly connected with the installation sliding block arranged on the light source guide rail truss, and the camera module and the light source module move to an appointed measurement position through the installation sliding block.
Preferably, the positions of the camera rail truss and the sheet light source rail truss on the fixed frame are adjustable to adapt to the pump impeller sleeves with different sizes.
Preferably, the pump impeller sleeve is made of a non-transparent material.
Preferably, the camera module comprises an industrial rigid pipeline endoscope, a port C connector and a camera, the camera is connected with the industrial rigid pipeline endoscope through the port C connector, and the objective end of the industrial rigid pipeline endoscope is guided into the pump impeller sleeve.
Preferably, the sheet light source module comprises a sheet light source endoscope and an adapter, the sheet light source endoscope is connected with the laser light guide arm through the adapter, and the transmitting end of the sheet light source endoscope is guided into the pump impeller sleeve.
On the basis of a water pump opaque impeller sleeve, an endoscope system is guided into the impeller sleeve by welding a phi 38 base, drilling a phi 10 through hole and assembling a sealing mechanism, and is combined with a camera and a sheet light source for PIV test to directly measure the axial speed field of the pump. After the invention is applied, the PIV axial flow velocity field test of the water pump does not need to reprocess the full transparent impeller sleeve, additionally arrange an optical distortion prevention auxiliary device and carry out optical distortion correction on the shot image, thereby reducing the test cost, simplifying the test process, improving the PIV test precision and realizing the non-contact direct measurement of the pump axial flow velocity field.
Drawings
FIG. 1 is a schematic view of the installation of modules of the present invention;
FIG. 2 is a schematic view of a test housing module;
FIG. 3 is a schematic view of the distribution of the pedestals;
FIG. 4 is a schematic view of a horizontal and vertical base plug;
FIG. 5 is a schematic view of an installation module;
FIG. 6 is a schematic view of a camera module;
FIG. 7 is a schematic view of a sheet light source module.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in fig. 1, the present invention discloses an endoscopic PIV testing apparatus for an axial flow velocity field test of a water pump, which comprises: the device comprises a test shell module 1, a mounting module 2, a camera module 3 and a sheet light source module 4.
With reference to fig. 2, the test housing module 1 comprises: a body 11, a base 12 and a sealing mechanism 13. The body 11 is a pump impeller sleeve. Referring to fig. 3, the base 12 is composed of a first horizontal base 121, a second horizontal base 122, a third horizontal base 123, and a first vertical base 124, a second vertical base 125, a third vertical base 126, which are axially arranged along the body 11. The first horizontal base 121, the second horizontal base 122 and the third horizontal base 123 are located on the same straight line, and horizontal through holes communicated with the inner cavity of the body 11 are respectively formed in the first horizontal base 121, the second horizontal base 122 and the third horizontal base 123. The first vertical base 124, the second vertical base 125 and the third vertical base 126 are located on another straight line, and vertical through holes communicated with the inner cavity of the body 11 are respectively formed in the first vertical base 124, the second vertical base 125 and the third vertical base 126. The first horizontal base 121 is circumferentially adjacent to the first vertical base 124, the second horizontal base 122 is circumferentially adjacent to the second vertical base 125, and the third horizontal base 123 is circumferentially adjacent to the third vertical base 126. The camera module 3 and the sheet light source module 4 are guided into the body 11 through the base 12 to designate a measurement position.
As shown in fig. 4, the sealing mechanism 13 is used for sealing the base 12 and is composed of a sealing end cap 131, a horizontal base plug 132 and a vertical base plug 133. Sealing end covers 131 with holes in the middle are arranged at openings of the first horizontal base 121, the second horizontal base 122, the third horizontal base 123, the first vertical base 124, the second vertical base 125 and the third vertical base 126, and the sealing end covers 131 are in sealing fit with the corresponding first horizontal base 121, the second horizontal base 122, the third horizontal base 123, the first vertical base 124, the second vertical base 125 or the third vertical base 126. The openings and vertical through holes of the end caps 131 disposed on the first vertical base 124, the second vertical base 125, and the third vertical base 126 are plugged by vertical base plugs 133. The openings and horizontal through holes of the sealing end covers 131 disposed on the first horizontal base 121, the second horizontal base 122, and the third horizontal base 123 are blocked by the horizontal base plugs 132.
The vertical base plug 133 and the horizontal base plug 132 are rubber structural members having a multi-flap structure in the middle. The vertical base plug 133 or the horizontal base plug 132 is rotatably engaged with the end cap 131. Screwing the vertical base plug 133 or the horizontal base plug 132 on the sealing end cover 131, wherein the multi-petal structure in the middle of the vertical base plug 133 or the horizontal base plug 132 is completely closed; after the vertical base plug 133 or the horizontal base plug 132 is unscrewed, the multi-petal structure in the middle of the vertical base plug 133 or the horizontal base plug 132 is in an open state.
A space for placing the test housing module 1 is formed in the installation module 2, and the camera module 3 and the sheet light source module 4 are installed on the installation module 2 and can move to a specified measurement position on the installation module 2. As shown in fig. 5, the mounting module 2 includes a camera rail truss 21, a sheet light source rail truss 22, a fixing frame 23, and a mounting slider 24. The fixed frame 23 is a door-shaped structure formed by aluminum alloy sections, and the test shell module 1 is positioned in the fixed frame 23. The camera truss 21 is arranged at the middle position of the top of the fixed frame 23, and the camera truss 21 crosses the fixed frame 23 along the front-back direction. The middle part of the left side or the right side of the fixed frame 23 is provided with a guide rail truss 22, and the guide rail truss 22 and the base 12 of the testing shell module 1 are positioned on the same side. The rail truss 22 is spanned on the fixed frame 23 in the front-rear direction. The camera truss 21 and the guide rail truss 22 are both provided with mounting sliders 24, and the mounting sliders 24 can move back and forth in the guide rails of the camera truss 21 or the guide rail truss 22. The mounting slider 24 mounted on the camera truss 21 is used to fix the camera module 3. The mounting sliders 24 mounted on the rail trusses 22 are used to fix the sheet light source module 4. The camera module 3 and the sheet light source module 4 are moved to a specified measurement position by the mounting slider 24.
As shown in fig. 6, the camera module 3 includes an industrial rigid borescope 31, a C-port connector 32 and a camera 33, and the camera 33 is connected to the industrial rigid borescope 31 through the C-port connector 32. The vertical base plug 133 is unscrewed and the industrial rigid borescope 31 is inserted into the body 11 via the multi-lobed configuration of the vertical base plug 133. Then, the vertical base plug 133 is screwed tightly, and the multi-flap structure of the vertical base plug 133 presses the industrial rigid borescope 31, so as to form a sealing fit with the industrial rigid borescope 31. The objective end of the industrial rigid borescope 31 is located within the internal cavity of the body 11, and an image of the observation area is transmitted by the industrial rigid borescope 31 to the camera 33.
As shown in fig. 7, the sheet light source module 4 includes a sheet light source endoscope 41 and an adapter 42, and the sheet light source endoscope 41 is connected to the laser light guide arm through the adapter 42. The horizontal base plug 132 is unscrewed, and the sheet light source endoscope 41 is inserted into the body 11 through the multi-petal structure of the horizontal base plug 132. The vertical base plug 133 is then tightened and the multi-lobed configuration of the horizontal base plug 132 compresses the sheet source endoscope 41 to form a sealing engagement with the sheet source endoscope 41. The emitting end of the sheet light source endoscope 41 is positioned in the inner cavity of the body 11, and the light source emitted by the laser is converted into a sheet light source with the thickness of 2mm through the sheet light source endoscope 41 and is emitted into the detected area in parallel.
In the preferred embodiment of the invention, in the pump axial flow velocity field test, the impeller sleeve does not need to be reworked by using a fully transparent material and an optical distortion prevention device is not needed.
Specifically, the body 11 is simply transformed into the testing shell module 1, the testing shell module 1 can ensure the normal operation of the water pump and is used for the hydraulic and cavitation performance tests of the water pump, and the testing shell module 1 can also be led into the camera module 3 and the sheet light source module 4 to complete the endoscopic PIV test of the water pump.
In a preferred embodiment of the present invention, the measurement of all axial flow velocity fields of the pump can be accomplished by introducing the camera module 3 and the sheet light source module 4 into the test housing module 1.
Specifically, the first horizontal base 121, the second horizontal base 122 and the third horizontal base 123 are welded to the horizontal position of the body 11. The first vertical base 124, the second vertical base 125 and the third vertical base 126 are welded to the center normal position of the flow velocity field to be measured. And C, machining a phi 10mm through hole in the center of the horizontal base and the vertical base. After the first horizontal base 121 and the first vertical base 124 are introduced into the camera module 3 and the sheet light source module 4, the axial flow velocity field measurement of the water pump guide vane inlet is completed. Similarly, the second horizontal base 122 and the second vertical base 125, and the third horizontal base 123 and the third vertical base 126 are used for completing the static-dynamic distance and the axial flow velocity field measurement at the outlet of the impeller.
In the embodiment of the present invention, in order to prevent the endoscope from generating turbulence in the internal flow field after penetrating into the body 11 and affecting the measurement of the axial flow velocity field, the industrial rigid borescope 31 and the sheet light source endoscope 41 are preferably used in the present invention.
Specifically, the industrial rigid borescope 31 has a 0 ° field of view direction, a 50 ° field of view range, and a 5mm minimum depth of field, and the sheet light source endoscope 41 has a 0 ° emission direction and a 60 ° emission range. In a certain axial flow velocity field measurement, when the objective lens end of the industrial rigid borescope 31 and the transmitting end of the sheet light source endoscope 41 are led into the body 11 and flush with the inner diameter, 90% of the flow velocity field measurement can be completed, no turbulent flow is generated on the flow field in the water pump, and the non-contact direct measurement of the axial flow velocity field of the pump is really realized.
In the embodiment of the present invention, the connecting surfaces between the horizontal base plug 132 and the vertical base plug 133 and the inner diameter of the body 11 are R150 arc surfaces, so that the base 12 is sealed and no disturbance is generated to the internal flow field of the pump.
Specifically, machining allowance is reserved on the inner diameter of the inner flow channel of the body 11 and the surfaces of the R150 of the horizontal base plug 132 and the vertical base plug 133, the inner diameter of the assembled test shell module 1 is machined to be phi 300, and the surfaces of the R150 of the horizontal base plug 132 and the vertical base plug 133 are smoothly connected with the inner diameter of the body 11.
In the specific embodiment of the invention, the camera module 3 and the film light source module 4 are sensitive to vibration, and in order to measure the axial flow velocity field of the pump more accurately, the mode that the camera module 3 and the film light source module 4 are directly erected on the body 11 is cancelled, and the installation module 2 is additionally arranged.
Specifically, camera module 3 and film light source module 4 are isolated from the water pump through installation module 2 for reduce the influence of pump vibration to camera module 3 and film light source module 4, and camera truss 21 and guide rail truss 22 height accessible fixed frame 23 are adjusted, are used for adapting to the water pump of different mounting heights.
Compared with the traditional testing device, the testing device has the advantages of low cost, simple structure, convenience in operation, no need of image post-processing, capability of completing the measurement of all axial flow velocity fields of the pump and no generation of any turbulent flow, statistical display after the application of the testing device shows that the cost of the testing device is reduced by 40%, the testing period is shortened by 50%, and the accurate and non-contact direct measurement of all the axial flow velocity fields of the water pump is realized while the testing efficiency is improved.
Claims (10)
1. An endoscopic PIV testing device for a water pump axial flow velocity field test is characterized by comprising a testing shell module and an endoscope system, wherein the testing shell module comprises a pump impeller sleeve, a base and a sealing mechanism, and the endoscope system comprises a camera module and a sheet light source module;
the method comprises the following steps of (1) arranging N vertical through holes communicated with an inner cavity of a pump impeller sleeve on the pump impeller sleeve along a horizontal position, arranging N horizontal through holes communicated with the inner cavity of the pump impeller sleeve on the pump impeller sleeve along a central normal position of a flow velocity field to be measured, wherein N is more than or equal to 2, the nth vertical through hole is adjacent to the nth horizontal through hole in the circumferential direction, and N is 1, … and N; the base comprises N horizontal bases and N vertical bases, and the sealing mechanism comprises a horizontal sealing mechanism and a vertical sealing mechanism; the N horizontal sealing mechanisms are respectively installed at the N horizontal through holes through the N horizontal bases, and the N vertical sealing mechanisms are respectively installed at the N vertical through holes through the N vertical bases; the state of the horizontal sealing mechanism is switched between an opening state and a sealing state: a sheet light source module of the endoscope system penetrates into a pump impeller sleeve through a horizontal sealing mechanism in an open state, so that an emitting end of the sheet light source module is positioned in an inner cavity of the pump impeller sleeve, and light is emitted into a detected area in parallel; the horizontal sealing mechanism in a sealing state seals the corresponding horizontal through hole, or the horizontal sealing mechanism in a sealing state seals the corresponding horizontal through hole, so that the sheet light source module penetrating through the horizontal through hole is in sealing fit with the horizontal sealing mechanism; the state of the vertical sealing mechanism is switched between an opening state and a sealing state: a camera module of the endoscope system penetrates into the pump impeller sleeve through the vertical sealing mechanism in an open state, so that an objective lens end of the camera module is positioned in an inner cavity of the pump impeller sleeve, and an image of a measured area is obtained; the vertical sealing mechanism in the sealing state seals the corresponding vertical through hole, or the vertical sealing mechanism in the sealing state seals the corresponding vertical through hole, so that the camera module penetrating through the vertical sealing mechanism is in sealing fit with the vertical sealing mechanism.
2. The endoscopic PIV testing apparatus for water pump axial flow velocity field test according to claim 1, wherein N is 3, then the water pump guide vane inlet axial flow velocity field measurement is completed by using the sheet light source module introduced through the 1 st horizontal base and the horizontal sealing mechanism thereon and the camera module introduced through the 1 st vertical base and the vertical sealing mechanism thereon; and the static and dynamic distance and impeller outlet axial flow velocity field measurement is completed by utilizing the sheet light source module led in through the 2 nd to 3 rd horizontal bases and the horizontal sealing mechanisms on the horizontal bases to match with the camera module led in through the 2 nd to 3 rd vertical bases and the vertical sealing mechanisms on the vertical bases.
3. The endoscopic PIV testing apparatus for testing the axial flow velocity field of a water pump according to claim 2, wherein the objective end of the camera module and the emitting end of the light source module are flush with the inner diameter of the pump impeller sleeve after being guided into the pump impeller sleeve.
4. The endoscopic PIV testing apparatus of claim 1, wherein said sealing mechanism comprises a sealing end cap and a plug, wherein: the end cover middle part is formed with the trompil, end cover with horizontal base or the sealed cooperation of vertical base, end cover's trompil department is equipped with, and the state of end cap can open the state with switch between the encapsulated situation, the top and the end cover of end cap sealed cooperation, the bottom surface of end cap is the cambered surface that the radius is 150mm, the chamber wall of pump impeller sleeve pipe inner chamber is the diameter and is 300 mm's disc, the bottom surface of end cap with the chamber wall of pump impeller sleeve pipe inner chamber links up the fairing.
5. The endoscopic PIV testing apparatus for water pump axial flow velocity field testing according to claim 1, further comprising a mounting module separate from said test housing module, said camera module and said light sheet module being secured to said mounting module.
6. The apparatus according to claim 5, wherein the mounting module comprises a camera rail truss, a light source rail truss, a fixed frame, and a mounting slider, the camera rail truss and the light source rail truss are disposed on the fixed frame, the camera rail truss and the light source rail truss are respectively provided with a movable mounting slider, the camera module is fixedly connected with the mounting slider disposed on the camera rail truss, the light source module is fixedly connected with the mounting slider disposed on the light source rail truss, and the camera module and the light source module are moved to a specified measurement position by the mounting slider.
7. The endoscopic PIV testing apparatus for water pump axial flow velocity field testing according to claim 6, wherein the position of said camera rail truss and said light source rail truss on said fixed frame is adjustable to accommodate different sizes of said pump impeller sleeves.
8. The endoscopic PIV testing apparatus of claim 1, wherein said pump impeller sleeve is made of a non-transparent material.
9. The endoscopic PIV testing apparatus for water pump axial flow velocity field test according to claim 1, wherein said camera module comprises an industrial rigid borescope, a C-port connector and a camera, the camera is connected with the industrial rigid borescope through the C-port connector, and an objective end of the industrial rigid borescope is guided into said pump impeller sleeve.
10. The endoscopic PIV testing apparatus for testing the axial flow field of a water pump according to claim 1, wherein said light source module comprises a light source endoscope and an adapter, the light source endoscope is connected with a laser light guide arm through the adapter, and the emitting end of the light source endoscope is guided into the pump impeller sleeve.
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