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Device for measuring flow of flap gap based on PIV method

A technology of slots and flaps, applied in measuring devices, testing of machines/structural components, aerodynamic tests, etc., can solve problems such as difficulties, errors in measurement results, and increased workload in the secondary arrangement of optical paths, and achieve convenient measurement and calculation Fast, accurate results

Active Publication Date: 2018-03-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] The above-mentioned traditional method of shooting flap slit flow field based on PIV has the following defects: first, it is difficult to find the largest possible shooting area itself; second, the secondary arrangement of the optical path greatly increases the workload, and the efficiency very low; thirdly, splicing the results of the two measurements has a large error in the measurement results, not the experimental results of the same train, and there are many uncertainties

Method used

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  • Device for measuring flow of flap gap based on PIV method
  • Device for measuring flow of flap gap based on PIV method
  • Device for measuring flow of flap gap based on PIV method

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Embodiment Construction

[0033] Particle image velocimetry (PIV) is a two-dimensional velocity field test technology for transient flow plane, its basic principle is as follows: image 3 As shown, the micro tracer particles with good flow followability and light scattering are selected to be spread in the flow field, and then a laser sheet light source (thickness is about 1mm) is used to illuminate a test plane of the measured flow field. system (such as CDD camera (11)) etc.), respectively record the particle images of the flow field at t1 and t2 moments, and through the digital image processing of the PIV system (12), calculate the displacement of the particles in the two shooting time intervals. Calculate the velocity field. However, although the PIV technology has become a relatively mature particle velocity measurement method, there is still no progress in the fine measurement of small slots such as flap slots. The key lies in how to completely illuminate the entire seam channel with the laser o...

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Abstract

The invention belongs to the technical field of wind tunnel tests, and in particular relates to a device and method for measuring the flow of a flap gap based on a PIV method. The method comprises thesteps of emitting a laser sheet from an emitting end of a laser, and dividing the laser sheet into two laser sheets through a light path device; coarsely tuning reflectors in the light path device and making the two laser sheets radiating respectively from two directions into a flap gap; and finely tuning the reflectors and making the two laser sheets overlap, that is, completing the constructionof a light path. The device includes a beam splitting cube, reflectors, and an optical clamping member. The device also includes a PIV unit. The device is simple and practical in structural principle, well solves the problem of light path limitation on the PIV shooting of a flow field like a flap gap environment, and greatly improves the efficiency of PIV shooting.

Description

technical field [0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a device for measuring flap slot flow based on a PIV velocity measurement method. Background technique [0002] In the wind tunnel test, the PIV measurement of fine flow fields such as flap slots will make it difficult for the laser to illuminate the entire flow field area to be photographed due to the limitation of the gap space. The usual solution to this problem is to directly use the knowledge of geometric optics , as far as possible to find the largest area that can be photographed and shoot first, and for the remaining part of the area, it is necessary to rearrange the optical path and shoot again. Through the calculation of the PIV system, the two parts of the experimental results are spliced ​​to obtain the flow field of the entire shooting area result. [0003] The above-mentioned traditional method of shooting flap slit flow field based on PIV has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/02
CPCG01M9/02
Inventor 董昊夏天宇耿玺刘松刘是成张亚晓
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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