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Position-locking shooting method and device for carrying out particle image velocemetry (PIV) measurement under model dynamic pitching

A model and dynamic technology, applied in the field of aerospace, can solve problems such as inaccurate position of film light, difficulty in realization, increase of shooting error, etc.

Inactive Publication Date: 2011-03-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of PIV shooting in the case of dynamic pitching, one solution is to let the camera and the sheet light move together with the model. This solution is very difficult to implement, and after the movement of the laser light guide arm changes, the position of the sheet light will change. Inaccurate, increase the shooting error

Method used

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  • Position-locking shooting method and device for carrying out particle image velocemetry (PIV) measurement under model dynamic pitching
  • Position-locking shooting method and device for carrying out particle image velocemetry (PIV) measurement under model dynamic pitching
  • Position-locking shooting method and device for carrying out particle image velocemetry (PIV) measurement under model dynamic pitching

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example 1

[0017] For the method and device described in this method, during the experimental calibration, the system can be adjusted so that the optical axis of the camera is perpendicular to the ground of the wind tunnel, and the calibration plate is placed horizontally, and calibration is performed in this state. After the calibration is completed, if the field of view remains the same under different angles of attack, no re-calibration is required, which solves the problem of re-calibration when changing the cross-section in the traditional way.

[0018] After the above steps are completed, the sheet light has been fixed at the preset section, the camera has been adjusted in place, and the PIV system is ready. At this point, the PIV control system can be set to the external trigger state. After the model pitch control system makes the model reach the specified position, a pulse signal is sent to trigger the PIV system to collect. Therefore, the model pitch control system must be equi...

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Abstract

The invention provides a position-locking shooting method and device for carrying out particle image velocimetry (PIV) measurement under model dynamic pitching. In the method, a PIV is used to fix a PIV camera and a laser sheet at an angle to be shot, and when a model moves to a specific location, the PIV is triggered to measure. A mechanism for fixing the camera and the head of the laser sheet is a mobile support system, the system uses the transitions of horizontal degree of freedom and vertical degree of freedom and the rotation of a degree of freedom to stimulate the circular motion around the center of rotation of the model, and can change the radius of the circle in a stepless mode, and the relative position of the camera and the sheet remains unchanged by using a follow-up method of the camera and the sheet, thereby avoiding repeated demarcation and improving the experimental efficiency; and the motions of the three degrees of freedom can be controlled by a stepping motor which is controlled by a computer program, thus realizing full automation of position adjustment of the camera and the sheet.

Description

technical field [0001] The invention relates to a wind tunnel experiment method in the field of aerospace, in particular to a method and a device for performing PIV measurement in the dynamic pitching process of a model. Background technique [0002] High maneuverability is one of the main technical indicators that the new generation of fighters must meet, and the high maneuverability of fighters is usually achieved by quickly pulling up or dipping down at a large angle of attack. Therefore, in wind tunnel experiments, it is of great significance to study the flow characteristics of aircraft models under dynamic pitch. [0003] PIV technology is an important experimental measurement method for aerodynamic flow field research. PIV is the abbreviation of Particle Image Velocimetry. PIV technology breaks through the limitation of traditional single-point measurement, and can instantaneously measure the velocity distribution on a section in the flow field without contact, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/22G01M9/00
Inventor 马宝峰邓学蓥张杰王延奎李岩
Owner BEIHANG UNIV
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