CN110441021A - A kind of Flat Plate Turbulent Boundary Layer flow field structure measuring device and method based on PIV - Google Patents
A kind of Flat Plate Turbulent Boundary Layer flow field structure measuring device and method based on PIV Download PDFInfo
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- CN110441021A CN110441021A CN201910808182.8A CN201910808182A CN110441021A CN 110441021 A CN110441021 A CN 110441021A CN 201910808182 A CN201910808182 A CN 201910808182A CN 110441021 A CN110441021 A CN 110441021A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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Abstract
The present invention provides a kind of Flat Plate Turbulent Boundary Layer flow field structure measuring device and method based on PIV, belongs to aerodynamics the field of test technology.The experimental provision includes wind-tunnel, test plate, the high speed camera for receiving and recording KPT Scatter light, smoke tank, laser, piece photosystem.Wind-tunnel is sequentially connected to by air inlet section section, stable section, contraction section, experimental section, expansion segment, round corner section, power section, outlet section and is constituted, and test plate is fixed on experimental section center, and smoke tank is placed in bracket front end.Laser is transformed into piece light emission and entered in wind-tunnel by laser exhibition light device.The configuration of the present invention is simple, it is easy to operate, a period of time flow field instantaneous picture is obtained by high speed camera, then processing is carried out by PIVLAB program and obtains corresponding instantaneous velocity field and vorticity cloud atlas.The present invention has the features such as precision is high, lower to equipment requirement, the testing time is fast.
Description
Technical field
The Flat Plate Turbulent Boundary Layer flow field structure measuring device based on PIV method that the present invention relates to a kind of is used for lower stream
The measurement of the lower flat plate wall turbulent boundary layer flow field structure of speed, belongs to aerodynamics the field of test technology.
Background technique
Turbulent flow belongs to a kind of UNSTEADY FLOW, how effectively to describe turbulent flow property, is a problem.As people are constantly deep
It studies with entering, discovery turbulent flow can be understood as the vortex structure of multiple different scale and its random motion is constituted.Therefore pass through acquisition
Turbulent Flow Field resolves into different scale in turn, facilitates us for the understanding of turbulence characteristic.This method is applied to by we
In the flow field of Boundary Layer on Flat Plate, convenient for deeper into its property of understanding.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to the present invention provides a kind of plate turbulent flow based on PIV
Boundary layer flow field structure measurement device, main feature are as follows:
Flat Plate Turbulent Boundary Layer flow field structure measuring device based on PIV of the invention, including wind-tunnel, test plate, height
Fast camera, smoke tank, laser, Zhan Guangqi, reflecting piece；
The air duct is by air inlet section, stable section, contraction section, experimental section, expansion segment, round corner section, power section, outlet section
Sequentially connection is constituted, and air is flowed from air inlet section to outlet section；It is successively provided with pressure sensor in experimental section and test is flat
Plate is internally provided with variable-frequency motor, power blade and rectification stator blade in power section；
The test plate includes support frame, transparent plate, barometric gradient adjustable plate, electric putter, auxiliary stand, coarse
Band turns to twist to mix line；Transparent plate is placed on support frame and is horizontally fixed on the air duct experimental section center；Auxiliary stand
Leading edge and support frame rear are hinged, and auxiliary stand rear is connect with support frame by electric putter, and barometric gradient adjustable plate is fixed on
On auxiliary stand, rough zone and turn to twist to mix line and be sequentially arranged in transparent plate leading edge；
The laser is fixed on wind tunnel experiment section upper outer wall face, keeps laser flat perpendicular to test by reflecting piece
Plate.Laser is injected in wind-tunnel after exhibition light device forms piece light, and piece light is vertical with test plate and is parallel to incoming flow.Test is flat
Plate is replaced by piece light coverage area using black smooth plates, and reflective influence is reduced.Outside the high speed camera arrangement and wind-tunnel, from
Side is vertical with piece light, focuses on piece optical plane.
Using the method for the experimental provision of the measurement plate turbulent skn friction resistance, include the following steps: to test preceding tune
After whole laser is perpendicular to test platform, laser is opened up as piece light using exhibition light device and piece optical plane is parallel to incoming flow.Laser focuses
Above test platform nearby.Be bonded and put with lasing area using the plate for posting grid, to high speed camera focus with
And the determination of the parameters such as picture.By controlling the variable-frequency motor and power blade of power section, so that generating command speed in wind-tunnel
Flow field, while starting smoke generator, so that forming flowing velocity in experimental section full of slowly overflowing from outlet after smog in smoke tank
After the steady flow smog for the abutting test platform that uniformity is good, turbulivity is low.Start high speed camera record a period of time
Image.
Wherein high speed camera working resolution is 1150 × 710Pixels, sample frequency 4500Hz, soft using PIVLAB
Part carries out image procossing, and 16 × 16Pixels is selected as in the domain of interrogating of cross-correlation calculation, and the spatial resolution of each velocity vector is
1.12mm.The movement of particle in single frames is obtained by the variation that corresponding neighbour interrogates between the consecutive frame of domain, two frames are obtained by reconstruct
Between instantaneous velocity field and vorticity cloud atlas.Change by comparing instantaneous velocity field and vorticity cloud atlas, the intuitive flow field that obtains becomes
Change.
In whole process, the gas flow rate in experimental section is obtained by the data that pressure sensor measures, is become by control
The flow velocity of gas in the entire air duct of the rotational speed regulation of frequency motor adjusts the angle of barometric gradient adjustable plate by control electric putter
Degree reaches zero pressure gradient distribution to adjust the barometric gradient distribution of measurement plate upper surface flowing.
The present invention realizes that air is logical using the control system of pressure sensor, variable frequency motor controller, variable-frequency motor composition
The overall-in-one control schema of gas flow rates in road；The gas flow rate in experimental section is obtained by the data that pressure sensor measures,
Then by the flow velocity of gas in the entire air duct of rotational speed regulation of variable-frequency motor, all control is all controlled by computer,
It can may be implemented to automatically control with the flow velocity of air, temperature in the entire air duct of real-time display, design principle is reliable, operation
It is easy, test is accurate.
The present invention measures the experimental provision and method of plate turbulent skn friction resistance, directly can accurately measure plate turbulence edge
VELOCITY DISTRIBUTION in interlayer, wind tunnel device operation and control of the present invention are easy, and the revolving speed of frequency conversion fan, pressure are controlled by computer
Sensors measure pressure difference is simultaneously converted to flow velocity, it can be achieved that flow velocity is continuously adjusted and monitored in real time within the scope of 5~30m/s, obtains
The low experimental wind flow of even velocity of flow, turbulivity, realizes stable experimental wind flow.
Detailed description of the invention
Fig. 1 is the experimental provision principle schematic diagram for the measurement plate turbulent skn friction resistance implemented according to the present invention.
Fig. 2 is the structural schematic diagram of test plate in the experimental provision of present invention measurement plate turbulent skn friction resistance.
In attached drawing 1 and attached drawing 2, mark as follows:
1- air inlet section, 2- screens, 3- stable section, 4- contraction section, 5- experimental section, 6- expansion segment, the round corner section 7-, 8- power
Section, 9- outlet section, 10- rough zone turn to twist to mix line, 11- laser, 12- reflector, and 13- opens up light device, 14- piece light, 15- pressure
Adjustable plate, 16- smoke tank, 17- bracket, 18- high speed camera.
Specific embodiment
1 and Fig. 2 and embodiment are described in more detail the present invention with reference to the accompanying drawing.
The experimental provision of the measurement plate turbulent skn friction resistance provided according to the present invention, as shown in Figure 1 and Figure 2, including air inlet
Section 1, screens 2, stable section 3, contraction section 4, experimental section 5, expansion segment 6, round corner section 7, power section 8, outlet section 9 are sequentially connected with shape
At wind-tunnel, constitute the air circulation system of complete set, air-flow direction is to be flowed to export through entire wind-tunnel by air inlet section
Section.
Experimental section is rectangular section, and measurement plate includes transparent plate, is horizontally fixed on air duct by support frame 17
Pressure sensor 7 is arranged in the center of experimental section 8 before testing plate inside experimental section 5.Measuring plate further includes barometric gradient
Adjustable plate 15, rough zone 10 turn to twist to mix line 10；Auxiliary stand leading edge and 17 tail portion of support frame are hinged, auxiliary stand rear and branch
Support 17 connects, and barometric gradient adjustable plate 15 is fixed on auxiliary stand, rough zone 10 and turns to twist and mixes line 10 and be sequentially arranged in saturating
The leading edge of bright plate makes to flow sufficiently development on plate to be turbulent flow.
The smoke tank 16 is located at test platform leading portion, turns after twisting and stumbling line, and the smoke generator passed through outside pipeline and wind-tunnel connects
It connects.Smoke tank outlet is 20mm for a length of 400mm wide together and is in 15 ° of fine crack with test platform.
Laser is fixed on wind tunnel experiment section upper outer wall face, makes laser perpendicular to test plate by reflecting piece.Laser
It after exhibition light device forms piece light, injects in wind-tunnel, piece light 14 is vertical with test plate and is parallel to incoming flow.Plate is tested by piece
14 coverage area of light is replaced using black smooth plates, reduces reflective influence.Outside the high speed camera arrangement and wind-tunnel, from side
It is vertical with piece light, focus on piece optical plane.
Before experiment starts, after adjusting laser perpendicular to test platform, laser is opened up as piece light 14 and piece light using exhibition light device
14 planes are parallel to incoming flow.Laser 11 focuses on above test platform nearby.Use the plate and laser face paste for posting grid
Conjunction is put, and the determination of the parameters such as focusing and picture is carried out to high speed camera 18.By controlling the variable-frequency motor of power section 8 and moving
Power blade so that generating command speed flow field in wind-tunnel, while starting smoke generator, so that full of after smoke particle in smoke tank 16
It is slowly overflowed from outlet, forms the steady flow for the abutting test platform that flowing velocity uniformity is good, turbulivity is low in experimental section
After smog.Start the image that high speed camera 18 records a period of time.
Wherein 18 working resolution of high speed camera is 1150 × 710Pixels, and sample frequency 4500Hz uses PIVLAB
Software carries out image procossing, and 16 × 16Pixels, the spatial resolution of each velocity vector are selected as in the domain of interrogating of cross-correlation calculation
For 1.12mm.The movement of adjacent two interframe particle is obtained by the variation that corresponding neighbour interrogates between the consecutive frame of domain, is obtained by reconstruct
Obtain the instantaneous velocity field between two frames and vorticity cloud atlas.Change by comparing instantaneous velocity field and vorticity cloud atlas, it is intuitive to obtain
Flow field change.
In whole process, the gas flow rate in experimental section is obtained by the data that pressure sensor measures, is become by control
The flow velocity of gas in the entire air duct of the rotational speed regulation of frequency motor adjusts barometric gradient adjustable plate 15 by control electric putter
Angle reaches zero pressure gradient distribution to adjust the barometric gradient distribution of measurement plate upper surface flowing.
Claims (3)
1. a kind of Flat Plate Turbulent Boundary Layer flow field structure measuring device based on PIV, which is characterized in that the experimental provision includes
Wind-tunnel, test plate, high speed camera, smoke tank, laser, piece photosystem；
The air duct is by gas collection section, stable section, contraction section, experimental section, diffuser, round corner section, power section, outlet section
Sequentially connection is constituted, and air is flowed from gas collection section to outlet section；Pressure is successively provided with by airflow direction in experimental section
Sensor and test plate are internally provided with variable-frequency motor, power blade and rectification stator blade in power section；
The test plate includes support frame, transparent plate, barometric gradient adjustable plate, electric putter, auxiliary stand, rough zone, turns
It twists and mixes line；Transparent plate is placed on support frame and is horizontally fixed on the wind tunnel experiment section center；Auxiliary stand leading edge and branch
Support rear is hinged, and auxiliary stand rear is connect with support frame by electric putter, and barometric gradient adjustable plate is fixed on auxiliary stand
On, rough zone and turn to twist to mix line and be sequentially arranged in transparent plate leading edge；
The smoke tank is located at test platform leading portion, turns after twisting and stumbling line, is connect by pipeline with the smoke generator outside wind-tunnel；
The laser is fixed on wind tunnel experiment section upper outer wall face, by the reflecting piece in piece photosystem make laser perpendicular to
Test plate, laser by piece photosystem exhibition light device formed piece light after, inject wind-tunnel in, piece light with test plate it is vertical and
It is parallel to incoming flow, test plate is replaced by piece light coverage area using black plate, and reflective influence, the high speed camera cloth are reduced
Set with outside wind-tunnel, it is vertical with piece light from side, focus on piece optical plane.
2. the Flat Plate Turbulent Boundary Layer flow field structure measuring device according to claim 1 based on PIV, which is characterized in that
The outlet of the smoke tank is one of exit facet and test platform is in 15 ° of fine crack.
3. the method for application device as described in claim 1 measurement Flat Plate Turbulent Boundary Layer flow field structure, which is characterized in that packet
Include following steps:
After adjustment laser is perpendicular to test platform before test, laser is opened up as piece light using exhibition light device and piece optical plane is parallel to and
Stream, laser are focused on above test platform nearby, are bonded and are put with lasing area using the plate for posting grid, to high speed camera
Carry out the determination of the parameters such as focusing and picture；
By controlling the variable-frequency motor and power blade of power section, so that generating command speed flow field in wind-tunnel, while starting hair
Cigarette device forms that flowing velocity uniformity is good, turbulivity in experimental section so that full of slowly overflowing from outlet after smog in smoke tank
After the steady flow smog of low abutting test platform, the image of starting high speed camera record a period of time；
Wherein high speed camera working resolution be 1150 × 710Pixels, sample frequency 4500Hz, using PIVLAB software into
16 × 16Pixels is selected as in the domain of interrogating of row image procossing, cross-correlation calculation, and the spatial resolution of each velocity vector is
1.12mm obtains the movement of particle in single frames by the variation that corresponding neighbour interrogates between the consecutive frame of domain, obtains two frames by reconstruct
Between instantaneous velocity field and vorticity cloud atlas, change by comparing instantaneous velocity field and vorticity cloud atlas, intuitively obtain flow field change；
In whole process, the gas flow rate in experimental section is obtained by the data that pressure sensor measures, by controlling variable-frequency electric
The flow velocity of gas in the entire air duct of the rotational speed regulation of machine adjusts the angle of barometric gradient adjustable plate by control electric putter,
To adjust the barometric gradient distribution of measurement plate upper surface flowing, reach zero pressure gradient distribution.
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| CN201910808182.8A CN110441021A (en) | 2019-08-29 | 2019-08-29 | A kind of Flat Plate Turbulent Boundary Layer flow field structure measuring device and method based on PIV |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067842A (en) * | 2020-09-04 | 2020-12-11 | 天津大学 | Turbulent boundary layer processing method based on non-uniform query window particle image velocimetry technology |
| CN113188753A (en) * | 2021-03-16 | 2021-07-30 | 云南大学 | Test platform for real-time analysis of internal flow field of wet dust collector |
| CN113390603A (en) * | 2021-06-17 | 2021-09-14 | 哈尔滨工业大学 | Wind speed measuring device for low-pressure high-speed Mars wind tunnel and precision improving method thereof |
| CN114264573A (en) * | 2021-12-22 | 2022-04-01 | 西安交通大学 | Visual controllable atmospheric boundary layer smoke cloud diffusion simulation device and method |
| CN114295859A (en) * | 2021-12-31 | 2022-04-08 | 中国科学技术大学 | Multi-angle measuring device and method |
| CN117804733A (en) * | 2024-03-01 | 2024-04-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Wall turbulence boundary layer test device for generating space-time evolution |
| CN118090124A (en) * | 2024-04-24 | 2024-05-28 | 中国航空工业集团公司沈阳空气动力研究所 | Wall surface step resistance evaluation test device and simulation method |
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| CN107505117A (en) * | 2017-09-08 | 2017-12-22 | 浙江大学 | A kind of experimental provision and method for measuring flat board turbulent skn friction resistance |
| CN207036386U (en) * | 2017-07-20 | 2018-02-23 | 大连海事大学 | A kind of low-speed wind tunnel experimental bench based on Particle Image Velocimetry |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067842A (en) * | 2020-09-04 | 2020-12-11 | 天津大学 | Turbulent boundary layer processing method based on non-uniform query window particle image velocimetry technology |
| CN113188753A (en) * | 2021-03-16 | 2021-07-30 | 云南大学 | Test platform for real-time analysis of internal flow field of wet dust collector |
| CN113390603A (en) * | 2021-06-17 | 2021-09-14 | 哈尔滨工业大学 | Wind speed measuring device for low-pressure high-speed Mars wind tunnel and precision improving method thereof |
| CN113390603B (en) * | 2021-06-17 | 2022-09-13 | 哈尔滨工业大学 | Wind speed measuring device for low-pressure high-speed Mars wind tunnel and precision improving method thereof |
| CN114264573A (en) * | 2021-12-22 | 2022-04-01 | 西安交通大学 | Visual controllable atmospheric boundary layer smoke cloud diffusion simulation device and method |
| CN114264573B (en) * | 2021-12-22 | 2023-11-17 | 西安交通大学 | Visual controllable atmospheric boundary layer smoke and cloud diffusion simulation device and method |
| CN114295859A (en) * | 2021-12-31 | 2022-04-08 | 中国科学技术大学 | Multi-angle measuring device and method |
| CN114295859B (en) * | 2021-12-31 | 2023-03-10 | 中国科学技术大学 | Multi-angle measuring device and method |
| CN117804733A (en) * | 2024-03-01 | 2024-04-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Wall turbulence boundary layer test device for generating space-time evolution |
| CN118090124A (en) * | 2024-04-24 | 2024-05-28 | 中国航空工业集团公司沈阳空气动力研究所 | Wall surface step resistance evaluation test device and simulation method |
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Application publication date: 20191112 |
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