CN203146358U - Device for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump - Google Patents
Device for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump Download PDFInfo
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- CN203146358U CN203146358U CN 201220588864 CN201220588864U CN203146358U CN 203146358 U CN203146358 U CN 203146358U CN 201220588864 CN201220588864 CN 201220588864 CN 201220588864 U CN201220588864 U CN 201220588864U CN 203146358 U CN203146358 U CN 203146358U
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- demarcation
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Abstract
The utility model discloses a device for particle image velocimetry (PIV) error measurement and demarcation of a centrifugal pump. The device is used for PIV internal flow experiment error measurement and demarcation and relates to the field of fluid experiments. The device is composed of a volute, a demarcation disc, an impeller, a pump shaft, a coupler, a motor, a rotating speed sensor, a rotating speed display synchronizer, a damping base, a laser, a frame-cross charge coupled device (CCD) camera, an external triggering synchronizing device and a computer. The volute and the impeller are first disassembled, the demarcation disc is adjusted to the measurement section position, nuts at two ends are screwed to fix the demarcation disc on the pump shaft, errors of a PIV system are measured in the air, the volute is then assembled, errors of an experiment model are measured after the volute is full of working media, the demarcation disc is finally disassembled, the impeller is fixed on the pumps shaft and a flow field is measured through the PIV system to finish demarcation through two measured errors. The method is simple, easy to operate and high in generality and provides an effective research way for PIV measurement error analysis of the centrifugal pump.
Description
Technical field
The utility model relates to fluid mechanics experiment field, refers in particular to a kind of method and apparatus for centrifugal pump PIV error measure and demarcation.
Background technique
Particle image velocimetry technology (PIV) is a kind of contactless whole audience flow-speed measurement technology.PIV adds trace particle in fluid generally speaking, the bright flow field of sheet illumination with laser, taking the particle picture of fluid motion with camera with sheet light Vertical direction, again image is handled and analyzed, finally obtain a kind of method of measurement of each spot speed of two-dimensional/three-dimensional on the sheet optical cross-section of flow field.As a kind of whole audience, non-contact, noiseless, high-precision flow measurement method, PIV is applicable to the measurement of complex flowfields such as turbulent flow, UNSTEADY FLOW, has obtained using widely in complex rotation fluid machinery flow field surveys such as centrifugal pump.Liu Yingzheng proposition in " error analysis of LDV/PIV whole audience tachometric survey " (2002) will evenly be furnished with the blank sheet of paper of black lattice point " trace particle " towards a direction displacement distance s, start PIV system acquisition image simultaneously, utilize the result of correlation analysis to obtain PIV systematic error in the ideal case.Dong Mingzhe is on proposition in " experimental evaluation of PIV systematic measurement error and the application on diesel engine spraying is measured " (2005) is attached to sand paper at the uniform velocity the revolution disk, each spot speed of disk can be by calculating when known motor rotary speed, the particle that utilizes PIV to take on the disk obtains each spot speed, thereby has obtained the systematic error of PIV.Shao Chunlei has analyzed PIV and has measured the error of centrifugal pump flow field in " PIV measures with the design of model pump and the error analysis in measuring " (2007), but does not provide the method for error measure.Existing P IV error measurement method can only be measured the PIV systematic error, and can't measure other error.The development of decades has been passed through by the PIV system, and measurement error has more reduced much.And the geometric shape of centrifugal pump complexity has brought bigger centrifugal pump experimental model error to experiment.
The invention provides and a kind ofly not only can measure the PIV systematic error, and can measure the method and apparatus of centrifugal pump experimental model error, utilize the error that records to demarcate the PIV experiment.In addition, use demarcation dish of the present invention can also substitute scale stream field image and carry out the space scale demarcation.
Summary of the invention
The purpose of this utility model provides a kind of apparatus and method for centrifugal pump PIV error measure and demarcation, it not only can measure the PIV systematic error, and can measure centrifugal pump experimental model error, utilize the error that records to demarcate the PIV experiment.
The utility model substitutes impeller with the demarcation dish and is installed on the pump shaft, measures the PIV systematic error; The demarcation dish places spiral case, measures centrifugal pump experimental model error; The demarcation dish can move along the pump shaft direction, measures the error of different cross section.
The demarcation dish refers to the plexiglass disk of surperficial uniformly dispersing hemisphere shallow hole.
Centrifugal pump experimental model error refers to the refractive error between spiral case and working medium and the air.
Principle of the present utility model is: adjust the demarcation dish to measuring the sectional position, and screw two end nuts and be fixed on the pump shaft, in air, demarcate each spot speed of panel surface with the PIV systematic survey, demarcate each spot speed of panel surface with the known motor rotating speed and can obtain the PIV systematic error thus by calculating; Load onto spiral case, after treating to be full of working medium in the spiral case, in each spot speed of working medium internal surface, the speed of demarcating the panel surface each point with preceding planar survey compares, and obtains centrifugal pump experimental model error with PIV systematic survey demarcation dish; Unload the demarcation dish at last, load onto impeller and spiral case, with PIV systematic survey flow field, each measured spot speed is deducted the statistic of PIV systematic error and centrifugal pump experimental model error, can realize the demarcation to the PIV experiment.
Device of the present utility model comprises spiral case, demarcation dish, impeller, pump shaft, coupling, motor, speed probe, rotating speed demonstration and synchronizer, damping base, laser, strides frame CCD camera, external trigger synchronizer and computer; At pump shaft fixedly demarcation dish or impeller, demarcation dish or impeller are placed in the spiral case; Pump shaft links to each other with motor by coupling; Speed probe is fixed on motor shaft end, and spiral case, pump shaft, coupling, motor are placed on the damping base of horizontal positioned; Speed probe links to each other with the external trigger synchronizer with synchronizer by the rotating speed demonstration; Computer by external trigger synchronizer and laser with stride frame CCD camera and link to each other.Stride frame CCD camera and place over against demarcation dish or impeller, stride the axis normal of frame CCD camera camera plane and pump shaft.Laser is placed on the spiral case side, and the laser port of laser is towards parallel with the demarcation panel surface.The material of described demarcation dish is plexiglass.
In the said apparatus, demarcation dish diameter is identical with impeller; There is tapped hole demarcation dish centre, and its specification is identical with the tapped hole of impeller centre, and the demarcation dish utilizes two hexagon nuts to be fixedly mounted on the pump shaft, demarcates the rim pump shaft and moves axially; Demarcate panel surface uniformly dispersing diameter and be about 0.2mm to the hemisphere shallow hole of 0.3mm.Vertical interval is identical with level interval between the hemisphere shallow hole, is about for 1mm arrives 2mm, adopts laser beam machining or punch process.
Implementation process of the present utility model is as follows:
1. adjust the demarcation dish to measuring the sectional position, and screw two end nuts and be fixed on the pump shaft, the sheet illumination of laser is penetrated on the whole calibrating panel surface, adjustments motor speed is n, measures each spot speed of demarcation panel surface in air; With the true velocity that the known motor rotating speed is demarcated the panel surface each point, the speed that the panel surface each point is demarcated in contrast true velocity and measurement obtains the PIV systematic error.
2. load onto spiral case, after treating to be full of working medium in the spiral case, the sheet illumination of laser is penetrated on the whole calibrating panel surface, the adjustment motor speed is n, measure the demarcation dish in each spot speed of working medium internal surface, compare with measuring the speed of demarcating the panel surface each point, obtain centrifugal pump experimental model error.
3. unload the demarcation dish at last, load onto impeller and spiral case, the adjustment motor speed is n, and the sheet light of laser is radiated on the impeller, and each measured spot speed is deducted the statistic of PIV systematic error and centrifugal pump experimental model error, finishes the demarcation to the PIV experiment.
Use method of the present utility model can measure PIV systematic error and centrifugal pump experimental model error simultaneously, and general error measurement method can only obtain the PIV systematic error.Utilize the PIV system record same motor rotating speed subscript price fixing in air and experimental model in the surface each spot speed, can obtain centrifugal pump experimental model error; In the true velocity of known motor rotating speed markers disc setting surface each point, can obtain the PIV systematic error with aerial each the spot speed contrast of demarcation dish.For demarcating the tachometric survey of panel surface each point, general error measurement method need use cylinder-prism that the sheet light of laser is expanded to light beam.Use method of the present invention, by at demarcation dish processing hemisphere shallow hole, do not need the sheet light of laser is expanded to light beam.The hemisphere shallow hole that the uniformly dispersing diameter is very little on the demarcation dish uses the sheet light of laser just can finish measurement; The hemisphere shallow hole can guarantee " particle " image in a slice optical cross-section, has reduced because the error that method of measurement and device bring.
Use the utility model to measure the centrifugal pump experimental model error of different cross section.The demarcation dish can move along the pump shaft direction, and the demarcation dish utilizes two hexagon nuts to be fixed on the pump shaft.To different measurement cross sections, can measure the centrifugal pump experimental model error of different cross section by the mobile panel surface of demarcating.
Use the utility model can also utilize the error that measures that experiment is demarcated, reduce the uncertainty of centrifugal pump PIV experiment.
In addition, because radius and spacing between the hemisphere shallow hole are known, can use demarcation dish of the present utility model to substitute scale stream field image easily and carry out the size demarcation.
Description of drawings
Fig. 1 demarcation dish is directly installed on and installs schematic representation on the pump shaft.
Fig. 2 demarcation dish dress is placed in device schematic representation in the spiral case.
Fig. 2 PIV system experimental device figure.
Fig. 4 demarcation dish part sectioned view.
Fig. 5 demarcates panel surface hemisphere shallow hole distribution schematic diagram.
Fig. 6 is adjustable feast-brand mark price fixing device schematic representation.
Among the figure: 1. spiral case, 2. demarcation dish, 3. impeller, 4. pump shaft, 5. coupling, 6. motor, 7. speed probe, 8. rotating speed shows and synchronizer, 9. damping base, 10. laser, 11. stride frame CCD camera, 12. external trigger synchronizers, 13. computers.
Embodiment
Describe details and the working condition of the concrete device that the utility model proposes in detail below in conjunction with accompanying drawing.
This device comprises that spiral case 1, demarcation dish 2, impeller 3, pump shaft 4, coupling 5, motor 6, speed probe 7, rotating speed show with synchronizer 8, damping base 9, laser 10, stride frame CCD camera 11, external trigger synchronizer 12 and computer 13.
As shown in Figure 4, demarcation is coiled 2 surperficial uniformly dispersing diameters and is about 0.2mm to the hemisphere shallow hole of 0.3mm.Vertical interval is identical with level interval between the hemisphere shallow hole, is about for 1mm arrives 2mm, as shown in Figure 5.Because between the hemisphere shallow hole
Radius and spacing known, therefore can use demarcation dish 2 of the present utility model to substitute scale stream field images easily and carry out size and demarcate.It is exactly object or the scale that utilizes known actual size in the image that size is demarcated, the ratio of pixel and actual size in the computed image.
As shown in Figure 5, demarcation dish 2 can move along pump shaft 4 directions, and demarcation dish 2 utilizes two hexagon nuts to be fixed on the pump shaft 4.By mobile demarcation dish 2 surface to different measurement cross sections, can measure the centrifugal pump experimental model error of different cross section.
At first substitute impellers 3 with demarcation dish 2 and be fixed on the pump shaft 4, the sheet light of laser 10 is radiated on the whole surface of demarcation dish 2, as shown in Figure 1.Here sheet only utilizes the optical element cylindrical lens to the expansion character of light, and laser is radiated on the cylindrical lens, and lens are expanded in some directions laser, forms the laser of the elongated striation of wire.Adjusting motor 6 rotating speeds is n, measures demarcation dish 2 each spot speed of surface in air
When known motor 6 rotating speeds, can calculate demarcation dish 2 each spot speed of surface by following formula
:
Wherein V is the speed of point on the demarcation dish 2, and R is point coils 2 centers of circle to demarcation distance.Can calculate each point in air medium velocity absolute error by following formula
:
The PIV systematic error is exactly the speed absolute error of each point
Load onto spiral case 1 then, after treating to be full of working medium in the spiral case, the sheet illumination of laser 10 is penetrated on whole calibrating dish 2 surfaces, as shown in Figure 2.Adjusting motor 6 rotating speeds is n, measures demarcation dish 2 in each spot speed of working medium internal surface
, measuring the speed of demarcating the panel surface each point with demarcation dish 2
Compare, obtain each point in air with working medium medium velocity absolute error
:
Centrifugal pump experimental model error is exactly the speed absolute error of each point
At last demarcation dish 2 is unloaded, load onto impeller 3 and spiral case 1, as shown in Figure 3.After treating to be full of working medium in the spiral case 1, adjusting motor 6 rotating speeds is n, with PIV systematic survey flow field, obtains each spot speed
, will
Deduct the PIV systematic error
With centrifugal pump experimental model error
, obtain PIV speed cone definite value
:
Finish the demarcation to the PIV experiment.
Claims (4)
1. device that is used for centrifugal pump PIV error measure and demarcation, it is characterized in that, comprise that spiral case (1), demarcation dish (2), impeller (3), pump shaft (4), coupling (5), motor (6), speed probe (7), rotating speed show with synchronizer (8), damping base (9), laser (10), stride frame CCD camera (11), external trigger synchronizer (12) and computer (13); Described at pump shaft (4) fixedly demarcation dish (2) or impeller (3), demarcation dish (2) or impeller (3) are placed in the spiral case (1); Pump shaft (4) links to each other with motor (6) by coupling (5), and speed probe (7) is fixed on motor (6) axle head; Spiral case (1), pump shaft (4), coupling (5), motor (6) are placed on the damping base (9) of horizontal positioned; Speed probe (7) shows by rotating speed and links to each other with external trigger synchronizer (12) with synchronizer (8); Computer (13) by external trigger synchronizer (12) and laser (10) with stride frame CCD camera (11) and link to each other; Stride frame CCD camera (11) and place over against demarcation dish (2) or impeller (3), stride the axis normal of frame CCD camera (11) camera plane and pump shaft (4); Laser (10) is placed on spiral case (1) side, and the laser port of laser is towards parallel with demarcation dish (2) surface.
2. a kind of device for centrifugal pump PIV error measure and demarcation as claimed in claim 1 is characterized in that, described demarcation dish (2) diameter is identical with impeller (3); There is tapped hole demarcation dish (2) centre, and its specification is identical with the tapped hole of impeller (3) centre; Demarcation dish (2) utilizes two hexagon nuts to be fixedly mounted on the pump shaft (4), and demarcation dish (2) moves axially along pump shaft.
3. a kind of device for centrifugal pump PIV error measure and demarcation as claimed in claim 1, it is characterized in that, described demarcation dish (2) surface calibrate panel surface uniformly dispersing diameter is that 0.2mm is to the hemisphere shallow hole of 0.3mm, vertical interval is identical with level interval between the hemisphere shallow hole, for 1mm arrives 2mm.
4. a kind of device for centrifugal pump PIV error measure and demarcation as claimed in claim 1 is characterized in that, the material of described demarcation dish (2) is plexiglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220588864 CN203146358U (en) | 2012-11-09 | 2012-11-09 | Device for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220588864 CN203146358U (en) | 2012-11-09 | 2012-11-09 | Device for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump |
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| CN 201220588864 Withdrawn - After Issue CN203146358U (en) | 2012-11-09 | 2012-11-09 | Device for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062075A (en) * | 2012-11-09 | 2013-04-24 | 江苏大学 | Device and method for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump |
| CN104141618A (en) * | 2014-08-20 | 2014-11-12 | 中国船舶重工集团公司第七0四研究所 | Decoupling testing device for centrifugal pump |
| CN105114337A (en) * | 2015-09-11 | 2015-12-02 | 江苏大学 | Device and method for synchronous accurate measurement of transient flow field of vane pump |
| CN106768752A (en) * | 2016-11-11 | 2017-05-31 | 哈尔滨工程大学 | Stream excited vibration separator and test method in a kind of centrifugal pump |
-
2012
- 2012-11-09 CN CN 201220588864 patent/CN203146358U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103062075A (en) * | 2012-11-09 | 2013-04-24 | 江苏大学 | Device and method for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump |
| CN103062075B (en) * | 2012-11-09 | 2015-06-10 | 江苏大学 | Device and method for particle image velocimetry (PIV) error measurement and demarcation of centrifugal pump |
| CN104141618A (en) * | 2014-08-20 | 2014-11-12 | 中国船舶重工集团公司第七0四研究所 | Decoupling testing device for centrifugal pump |
| CN104141618B (en) * | 2014-08-20 | 2016-04-13 | 中国船舶重工集团公司第七0四研究所 | The decoupling zero testing apparatus of centrifugal pump |
| CN105114337A (en) * | 2015-09-11 | 2015-12-02 | 江苏大学 | Device and method for synchronous accurate measurement of transient flow field of vane pump |
| CN106768752A (en) * | 2016-11-11 | 2017-05-31 | 哈尔滨工程大学 | Stream excited vibration separator and test method in a kind of centrifugal pump |
| CN106768752B (en) * | 2016-11-11 | 2018-10-26 | 哈尔滨工程大学 | A kind of centrifugal pump is interior to flow excited vibration separator and test method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130821 Effective date of abandoning: 20150610 |
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| RGAV | Abandon patent right to avoid regrant |