Video Measurement Method of Fluid Density Projection Field Around Wind Tunnel Test Model
A technology of wind tunnel test and video measurement, which is applied in the direction of measuring device, aerodynamic test, machine/structural component test, etc. It can solve the problem of insufficient quantification, poor anti-interference ability of interferometry technology, and insufficient spatial resolution of wave surface sensors and other problems, to achieve the effect of solving the problem of quantitative insufficiency
Active Publication Date: 2018-10-02
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology
When using this method to measure the flow density projection field around the wind tunnel test model, it solves the problems of insufficient quantification of traditional schlieren and shadow technology, poor anti-interference ability of interferometry technology, insufficient spatial resolution of wave surface sensors and defects of existing BOS technology.
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[0037] A method for video measurement of a flow density projection field around a wind tunnel test model, comprising the following steps:
[0038] Step 1. At the test site of the wind tunnel test, set up such as figure 1 In the optical path shown, the optical axis of the camera is parallel to the z-axis of the wind tunnel coordinate system, the background plate is perpendicular to the z-axis of the wind tunnel coordinate system, and the circular marking points alternated in rows and columns are arranged on the background plate. Measure the distance Z between the background plate and the center plane of the wind tunnel test section D , measure the coordinate values of at least three circular marker points on the background plate in the wind tunnel coordinate system.
[0039] The distance Z from the background plate to the center of photography B Greater than the diagonal length D of the smallest circumscribed rectangle of the background plate.
[0040] Step 2. Use the know...
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The invention discloses a wind tunnel test model flow density projection field video measurement method. Through measuring deflection angles of non-parallel light passing through a disturbance flow field, quantitative relationships between disturbance flow field refractive indexes and deflection angles is established, an analytic expression is utilized to directly calculate density projection magnitudes of corresponding positions of the disturbance flow field, compared with a density projection field analysis method solving a partial differential equation, calculation complexity is quite lower, problems of error amplification and peak value loss possibly generated during discrete data differential operation can be further avoided, and a new approach is provided for quantitative analysis on the density projection field. The method is advantaged in that during wind tunnel test model flow density projection field measurement, problems of insufficient quantification of the traditional schlieren and shadow technology, poor anti-interference capability of the interference measurement technology, insufficient wave surface sensor spatial resolution and defects of the BOS technology in the prior art are solved.
Description
technical field [0001] The invention belongs to the field of flow display of wind tunnel test, in particular to a video measurement method of flow density projection field around a wind tunnel test model. Background technique [0002] Testing the flow field parameters of complex flows around high-speed / ultra-high-speed aircraft is an important means for flow theory research and development of flow control technology. Although computational fluid dynamics (Computational Fluid Dynamics, CFD) has developed rapidly, CFD cannot establish a more accurate model for highly nonlinear / unsteady complex flow phenomena such as flow separation / vortex, shock wave / boundary layer / shear layer, etc. , it is difficult to accurately simulate the complex flow field around high-speed / ultra-high-speed aircraft. [0003] At present, in the wind tunnel test, the flow field parameter testing technology of complex flow around mainly includes: schlieren and shadow technology, interferometry technology ...
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IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 周润张征宇黄叙辉李平唐亮范金磊
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT