Development of Bi-Luminophore Pressure-Sensitive Paint Systems

Bi-luminophore pressure-sensitive paint (bi-PSP) has been developed in order to correct the error due to temperature dependence of PSP and increase PSP measurement accuracy. The bi-PSP was composed of pressure-and temperature-sensitive dye. Tetranuclear europium (III) complexes and PdTFPP were used as temperature-and pressure-sensitive dye, respectively. The luminescence intensity of the Eu complex was highly sensitive to temperature and insensitive to pressure. The bi-PSP was examined using a painted coupon and its characteristics were clarified. As a verification test, pressure distributions on a supersonic transport (SST) model at low-speed flow were acquired by the bi-PSP measurement system. The root mean square of Cp at 50m/s was approximately 0.1 (150 Pa) at flow speed of 50m/s, indicating that this bi-PSP system can measure more accurately pressure than conventional pressure conversion technique using reference PSP images immediately after stop of wind tunnel free stream. Furthermore, pressure images at angles of side-slip were clearly visualized, although PSP/temperature-sensitive paint (TSP) combined system can not acquire the overall pressure images of the whole model surface.