Single-frame particle imaging tachymeter suitable for high-speed flow filed and speed measurement method

Abstract

The invention aims to provide a single-frame particle imaging tachymeter suitable for a high-speed flow field and a speed measurement method. The single-frame particle imaging tachymeter includes a laser, a high-speed CCD camera, a synchronous controller, a particle generator, a sheet light source system, a test window and an image acquisition and analysis system, the synchronous controller is connected with the laser and the high-speed CCD camera, a test flow field is inside the test window, pulse laser generated by the laser is irradiated on the test window through the sheet light source system, the particle generator is connected with the test window, the high-speed CCD camera faces the test window, and the image acquisition and analysis system is connected with the high-speed CCD camera. The single-frame particle imaging tachymeter suitable for the high-speed flow field can well solve the problem of influence on measurement brought by the fact that a synchronizer is difficult to accurately control a pulse interval of a laser and a photographing interval of a high-speed CCD camera when a traditional PIV speed measurement system is applied to a high-speed flow field, and avoids the problem that related particles are searched from two images to perform speed calculation.

Description

Technical field [0001] The invention relates to a particle image velocity measuring device and method. Background technique [0002] Flow field is the space occupied by fluid movement. Flow fields are widely used. With the advancement of science and technology, high-speed flow fields are gradually involved in many technical fields. For example, jet aircraft tail nozzles are high-speed flow fields. A clear and accurate understanding of the velocity distribution in each interval in the high-speed flow field is of great significance to research and solve problems. Therefore, there is an urgent need for a global velocity measurement instrument for high-speed flow fields. [0003] The initial flow field velocity test was mainly based on single-point testing, including hot-wire wind speed measurement method and laser Doppler speed measurement method. The hot-wire wind speed measurement method uses a thin metal wire that is heated by electricity as the probe and places it at the de...

AI Technical Summary

Problems solved by technology

However, when this method measures the high-speed flow field, it is necessary to shorten the time for taking pictures of the two images, which increases the requirements for the controller under certain circumstances. In addition, it is more complicated to find related particles in the two images for velocity calculation.

This limits the application of traditional particle image velocimetry techniques in high-speed flow fields.

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