Effect of Temperature Compensation on Measurement of Pressure Distribution for Inner Flow Fields using Pressure Sensitive Paint

Abstract

Nowadays, fast-response pressure sensitive paints (PSP) with high pressure sensitivity and application methods for internal flows are developed, and it is expected that the development enables application of PSP to EFD analysis of internal flows of turbomachinery. However, temperature sensitivity of PSP is still a serious source of measurement error. In this study, we apply PSP and TSP to inner surface of a turbofan casing, to examine the non-uniformity of temperature distribution on the surface when the turbofan is operated, and its effect on pressure measurement by PSP. As a result, temperature distribution on the inner surface of the turbofan casing in operation showed non-uniformity as large as 4K, causing serious error of 26kPa in the result of PSP. By applying temperature compensation, the error has decreased drastically as small as 0.29kPa.