Method for testing water surface fine-speed flow field

A test method and flow field technology, which is applied in the direction of fluid velocity measurement, velocity/acceleration/shock measurement, and measurement devices, can solve problems such as non-existent measurement methods, and achieve the effect of simple and effective methods and high application flexibility

Active Publication Date: 2013-10-02
中国船舶重工集团公司第七〇二研究所
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Problems solved by technology

[0002] The measurement technology of the water surface flow field is a key test technology for the research on the wake of underwater vehicles. At present, the conventional flow field test instruments include LDV (laser Doppler velocimetry), ADV (acoustic Doppler velocimetry), PIV (Particle image velocimetry), hot film instrument, Pitot tube, etc., but these testing techniques can only be used to measure the flow field in water, and there is no effective measurement method for the water surface flow field at the free surface.

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  • Method for testing water surface fine-speed flow field
  • Method for testing water surface fine-speed flow field
  • Method for testing water surface fine-speed flow field

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Embodiment Construction

[0024] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0025] A method for testing a water surface micro-velocity flow field, characterized in that it comprises the following steps:

[0026] The first step: if figure 1 As shown, the shooting tool 1 is arranged above the laminar flow test pool 3, and the shooting tool 1 is a CCD camera, which is used to shoot the motion loss image of the tracer particles on the water surface. The resolution of the CCD camera is 1600pixels×1200pixels, and the focal length is 24mm , the shooting frequency is 1hz~34hz, the distance between the CCD camera and the water surface of the stratified flow test pool is 3m, adjust the height of the CCD camera from the water surface so that the shooting area covers one side of the stratified flow test pool wall to the entire tow model, and the shooting range is 1057mm×792mm.

[0027] The second step: evenly spray the trac...

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Abstract

The invention relates to a method for testing a water surface fine-speed flow field. A light source is used for illuminating tracer particles, and with the cooperation of a CCD aperture, a V-shaped convergence and divergence flow field formed by tracer particles transmitted to the water surface by internal waves excited by a dragging model is photographed. The measurement of flow field speed is realized by following the speed of the tracer particles which move together with the flow field by using the above principle. The method is simple and effective, is high in application flexibility, and realizes non-contact and non-interference 'surface type' measurement of an mm / s order water surface flow field.

Description

technical field [0001] The invention relates to a method for testing the velocity of a water surface flow field, in particular to a method for testing a water surface microvelocity flow field based on an optical particle image cross-correlation analysis method applied in a fluid mechanics laboratory. Background technique [0002] The measurement technology of the water surface flow field is a key test technology for the research on the wake of underwater vehicles. At present, the conventional flow field test instruments include LDV (laser Doppler velocimetry), ADV (acoustic Doppler velocimetry), PIV (Particle image velocimetry), hot film instrument, Pitot tube, etc., but these testing techniques can only be used to measure the flow field in water, and there is no effective measurement method for the water surface flow field at the free surface. Contents of the invention [0003] Aiming at the above-mentioned existing problems, the applicant has carried out testing and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/22
Inventor 姚志崇洪方文张军祁江涛梁川瞿树成
Owner 中国船舶重工集团公司第七〇二研究所
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