Measuring system for pressure response time of pressure-sensitive paint and temperature response time of temperature-sensitive paint

Abstract

The invention discloses a measuring system for pressure response time of a pressure-sensitive paint and temperature response time of a temperature-sensitive paint. The measuring device comprises a shock tube, a shock tube test wall plate, a dynamic pressure sensor, an LED (light-emitting diode) light source, a photomultiplier and an optic quartz glass window. The measuring method comprises the following steps: adjusting the LED light source and the photomultiplier, pressurizing the high-pressure section of the shock tube by the photomultiplier to the default pressure; analyzing the time that shock wave S arrives at the test location, which is recorded by the dynamic pressure sensor; analyzing the tested paint fluorescence intensity data curve recorded by the photomultiplier; determining the time that the shock wave S sweeps through the paint fluorescence intensity and achieves 90% of the standing state, and obtaining the pressure / temperature response time of the tested paint. The measuring device is simple and reliable, and can be used for determining the pressure / temperature-sensitive paint response time which is smaller than ms magnitude.

Description

technical field [0001] The invention relates to a wind tunnel test pressure-sensitive coating / temperature-sensitive coating performance measurement technology, in particular to a shock wave method pressure-sensitive coating pressure response time / temperature-sensitive coating temperature response time measuring device and method. Background technique [0002] Wind tunnel pressure-sensitive paint test technology is a new type of wind tunnel test technology developed in the 1980s. It uses the fluorescence quenching effect of oxygen molecules on probe molecules (active components in pressure-sensitive paints) The lifetime or intensity of the fluorescence emitted by the excited probe molecules is used to obtain the local environmental pressure. Because it is a "non-intrusive" wind tunnel test technology, it has little disturbance to the flow field, short test period, significant economic benefits and wide application, so it has received extensive attention. [0003] The tempera...

AI Technical Summary

Problems solved by technology

Pressure-sensitive coatings that respond slowly to pressure changes can only be applied to pressure measurement tests in a steady state, and temperature-sensitive coatings that respond slowly to temperature changes can only be used in temperature measurement tests in a steady state. Under unsteady conditions, there are rapid and even high-frequency pressure / temperature fluctuations or changes on the surface of the test model, and unsteady pressure / temperature measurement tests must use fast pressure / temperature response coatings that can respond quickly to pressure / temperature changes

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