Unsteady PSP Measurement of Transonic Unsteady Flow Field around a Rocket Fairing Model

Abstract

Unsteady Pressure-Sensitive Paint (PSP) measurement of a rocket faring model was conducted at the JAXA 2m×2m Transonic Wind Tunnel as a part of the campaign to investigate the steady and unsteady flow field and to obtain the CFD validation data. Unsteady PSP measurement results of M=0.8 and =0 and +4° were described in this paper. Anodized-aluminum PSP (AA-PSP) was coated on the model surface, and it was illuminated by a high-power blue laser diode. AA-PSP luminescence was measured by a high-speed camera, whose frame rate was 5k frame-per-sec. The high-speed camera images were reduced to the time-series Cp distribution images using in-situ method involving pressure transducer data. Several kinds of data analysis were applied to the time-series Cp images and discussed about steady pressure distribution, unsteady pressure variation, and the results of the spectral analysis of the flow field around a rocket faring configuration.