Toward the Development of Unsteady PSP Measurement

Abstract

This paper describes the latest research trends in unsteady PSP measurement using fast-response PSP at Tohoku University, Asai and Nonomura laboratory. Measurement techniques for the low-pressure environment and the supersonic flow have been studied in an effort to expand the application limit of fast-response PSP of unsteady pressure measurement. It was clarified that the pressure sensitivity and frequency response of PSP generally decrease at low pressure. Furthermore, an example of unsteady pressure measurement on the surface of a cylinder at a low pressure of 1-22 kPa using AA-PSP is shown. In the application of unsteady PSP measurement under supersonic airflow conditions, PSP with low-temperature sensitivity, low photodegradation, and high-emission intensity is required in addition to fast response of a PSP. The pressure fluctuation of the supersonic unsteady phenomenon of approximately 18 kHz is successfully obtained by combining H₂TCPP-based AA-PSP with low-temperature sensitivity and fast response with a high-power laser.