Full field measuring system and method of reynolds stress of compressible turbulent flow

A technology of Reynolds stress and measurement system, applied in aerospace and aerodynamic fields, can solve the problem that compressible turbulent Reynolds stress cannot be measured

Active Publication Date: 2012-05-02
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0015] The purpose of the present invention is to provide a full-field measurement system and method of compressible turb

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  • Full field measuring system and method of reynolds stress of compressible turbulent flow
  • Full field measuring system and method of reynolds stress of compressible turbulent flow
  • Full field measuring system and method of reynolds stress of compressible turbulent flow

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Embodiment Construction

[0032] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0033] see figure 1 , the full-field measurement system of compressible turbulent Reynolds stress of the present invention includes a wind tunnel 10 , a nanoparticle generator 20 , a dual-cavity laser 30 , a synchronization controller 40 , a CCD camera 50 and a computer 60 .

[0034] The launch port of the nano particle generator 20 is facing the entrance of the wind tunnel 10 . The nano particle generator 20 injects nano tracer particles into the wind tunnel test section 12 of the wind tunnel 10 to trace the flow field in the wind tunnel test section 12 .

[0035] The wind tunnel experiment section 12 is a light-transmitting part with optical windows around and inlaid with optical glass respectively, so that the CCD camera 50 can expose the flow fie...

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Abstract

The invention provides a full field measuring system and method of reynolds stress of a compressible turbulent flow. The method comprises the steps that: nano trace particles are put into an experimental section of a wind tunnel by a nano particle generator; a second control signal is sent out by a synchronous controller according to a first control signal of a computer; after the second control signal is received by a charge coupled device (CCD) camera, a flow field in the experimental section of the wind tunnel is exposed, and meanwhile, laser beams are successively emitted by a double-cavity laser within the time of exposure of the CCD camera; two nano particle images relevant to the time are obtained by the CCD camera; and the velocity field and the density field of the flow field are simultaneously obtained by the computer according to the two nano particle images relevant to the time, and then the reynolds stress of the compressible turbulent flow is obtained. Through the full field measuring system and method, the technical problem that the velocity field and the density field cannot be simultaneously obtained can be solved, and then the aims that the velocity field and the density field of the compressible turbulent flow are simultaneously measured and the reynolds stress of the compressible turbulent flow is obtained according to the velocity field and the density field which are simultaneously measured are achieved.

Description

technical field [0001] The invention relates to the fields of aerospace and aerodynamics, in particular to a full-field measurement system for compressible turbulent Reynolds stress. In addition, the present invention also relates to a method for measuring Reynolds stress using the above-mentioned full-field measuring system for compressible turbulent Reynolds stress. Background technique [0002] Reynolds stress is an important parameter in the study of turbulent flow. In theory, Reynolds stress is often used to analyze and explain turbulent flow laws and flow phenomena. In engineering, especially for aerospace vehicles, turbulence models are widely used for flow field numerical simulation, and Reynolds stress test data are the basis and premise for building engineering turbulence models. Therefore, the experimental measurement of Reynolds stress is extremely urgent and has far-reaching theoretical significance and engineering value. [0003] Compressible turbulent flow i...

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Application Information

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IPC IPC(8): G01M9/02
Inventor 易仕和何霖陈植赵玉新田立丰
Owner NAT UNIV OF DEFENSE TECH
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