Device for large high-speed wind tunnel PIV tracer particle generation and remote flow control

Abstract

The invention discloses a device for large high-speed wind tunnel PIV tracer particle generation and remote flow control. The device comprises a control instruction input and feedback system, an air source pipeline and pressure regulating system, a particle generator flow regulating system and a particle generator; the control instruction input and feedback system issues remote control instructions to the air source pipeline and pressure regulating system and the particle generator flow regulating system, and receives feedback signals of the air source pipeline and pressure regulating system and the particle generator flow regulating system; the air source pipeline and the pressure regulating system is used for regulating the working pressure of the particle generator; the particle generator flow regulating system is used for regulating the working flow of the particle generator. The device meets the requirements of large high-speed wind tunnel tracer particle flow field following performance, light scattering characteristics and concentration; remote, efficient and precise tracer particle concentration control and adjustment in the PIV test process are realized, the test data quality is improved, and the test energy consumption and the labor cost are greatly reduced.

Description

Technical field[0001]The invention belongs to the technical field of high-speed wind tunnel tests, and specifically relates to a device for PIV tracer particle generation and remote flow control in large-scale high-speed wind tunnels.Background technique[0002]The PIV technology uses double-pulse lasers to irradiate the measured object (such as the airflow in a wind tunnel), broadcast tracer particles in the measured object to obtain two continuous particle images, and use the cross-correlation algorithm to obtain the same tracer particle displacement. Divide by the interval time of the two particle images, and finally get the velocity vector of the tracer particle. Calculate all the velocity vectors of the tracer particle in the particle image to obtain the velocity field. Since the tracer particles follow the motion of the measured object, on the premise that the tracer particles can truly follow the measured object, the obtained tracer particle velocity vector can also be regarded...

AI Technical Summary

Problems solved by technology

[0008] Large-scale high-speed wind tunnels are mainly temporary wind tunnels, and the single running time is usually only tens of seconds. The test Mach number change during a single running process can often be completed within a few seconds. The tracer particle concentration can be adjusted manually on site. The main problems are as follows: (1) The flow field tracer particle concentration monitoring site and the particle generator work site need to send an operator each, and the efficiency of password communication is low

(2) The operators at the working site of the particle generator lack perceptual knowledge of the particle concentration changes in the flow field, and it is difficult to quantify and adjust the parameters accurately. It may be necessary to carry out a communication between the data collector and the operator at the working site of the particle generator. Multiple iterative operations result in a large waste of air sources in large-scale high-speed wind tunnels

(3) The manual method requires on-site operation of a large number of valve systems, the operation efficiency is low, and the adjustment accuracy cannot be guaranteed

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