Fast responding pressure-sensitive paint: Accuracy improvement, combination with another measurement, and application to unsteady aerodynamics

建立了一种测量物体非定常绕流压力场和速度场的新方法。改进了快速响应压敏漆（PSP）测量技术，使其能够检测频率和幅值均为5kHz、小于100Pa的压力波动。导出了考虑发光寿命影响的PSP信号频率响应的解析解。利用该PSP和时间分辨粒子图像测速技术（PIV）构建了一个耦合系统。风洞试验表明，该系统的PIV头滴几乎不干扰PSP的信号。PIV测量的涡量与PSP测量的压力脉动有较好的相关性。

A novel method for measuring the pressure and velocity fields of unsteady flow around bodies was constructed. The measurement technique using fast responding pressure-sensitive paint (PSP) was improved to detect the pressure fluctuation whose frequency and amplitude are 5 kHz and less than 100 Pa. An analytic solution of the frequency response of the PSP signal was derived in which the effect of luminescence lifetime was considered. A coupled system using this PSP and the time-resolved particle-image velocimetry (PIV) was constructed. Wind-tunnel test of this system indicated that the sheading droplets for PIV hardly disturbed the signal from the PSP. The vorticity obtained by PIV correlated well with the pressure fluctuation measured by PSP.