Method and device for spreading trace particles in supersonic PIV (Particle Image Velocimetry) flow field testing experiment

Abstract

The invention relates to a method and a device for spreading trace particles in a supersonic PIV (Particle Image Velocimetry) flow field testing experiment. The trace particles are charged by using vacuum suction in a supersonic wind tunnel high-pressure high-temperature large-flow flow field environment, the trace particles are stored in a particle generator before the experiment, after a gas flow is injected, the gas flow and the trace particles are sufficiently mixed, pass through a high-pressure pipeline, are spread by a particle spreader and then enter a wind tunnel pipeline, the trace particles are uniformly spread under the condition of a high-Mach-number flow, and the trace particles are tested through a particle image velocity-measuring system. Compared with the prior art, the method and the device provided by the invention realize that the PIV trace particles are charged and uniformly spread in a high-pressure high-temperature large-flow flow field ambient condition, the probable agglomeration phenomenon of the trace particles in the injection process is effectively avoided, precise sequence control between a PIV system and wind tunnel operation is guaranteed, and the testing scheme corresponding to the spreading concentration satisfying the PIV operation requirement is determined.

Description

technical field [0001] The invention relates to the wind tunnel experiment technology in the aerospace field, in particular to a method and a device for distributing tracer particles in a supersonic PIV flow field test experiment. Background technique [0002] With the rapid development of space technology and hypersonic weapon equipment technology, the research on super / hypersonic compressible flow and related experimental testing technology has been greatly valued and developed, especially the quantitative velocity field distribution with high precision and high resolution testing technology. [0003] In recent years, particle image velocimetry technology (PIV) has made great progress in the application of flow field velocimetry. It breaks through the traditional single-point measurement limit, and can measure the velocity distribution on a cross-section in the flow field instantaneously without contact, and has a high measurement accuracy. Accuracy, good measurement resu...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for distributing tracer particles in supersonic PIV experiments in order to overcome the above-mentioned defects in the prior art, so that the supersonic PIV tracer particle dispensing system can be controlled manually or remotely and respond in real time , it can avoid and reduce the tracer particle agglomeration phenomenon during the spreading process, and can obtain an image with good particle distribution effect. After the PIV operation, a relatively ideal flow field vector distribution map can be obtained

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