Development of Temperature-Cancelled Motion-Capturing PSP System and Its Application to a Hypersonic Wind Tunnel

Abstract

A motion-capturing pressure-sensitive paint (PSP) system is applied to a hypersonic wind tunnel application. The 8 system consists of a two-color PSP and a fast-frame color camera. The supporting matrix of the PSP is anodized 9 aluminum, giving a fast time response as well as providing a temperature tolerance in the hypersonic flow. Our 10 developed PSP has a reference luminescence in green and a pressure-sensitive luminescence in red regions. 11 Generally, the temperature effect of a PSP measurement is a great issue. The developed system can reduce the 12 temperature effect of the PSP measurement by simply rationing the green and red images acquired from a high13 speed color camera. The system description and characterizations in terms of the pressure and temperature is 14 included in this paper. A hypersonic wind tunnel test is done at The Hypersonic and High Enthalpy Wind Tunnel at 15 The University of Tokyo, Kashiwa Campus. It provides Mach 7 flow for the test duration of 12 s. Our developed 16 system can capture the pressure distributions during the model insertion to the flow as well as the steady flow 17 conditions. 18