Study of pressure distribution of a fixed wall under low-speed jet impingement using pressure sensitive paint

Pressure sensitive paint (PSP) is a pressure measurement technology based on oxygen quenching mechanism of luminescence. Compared with conventional techniques, PSP technique has lower cost and higher spatial resolution. In this work, the PSP technique platform is constructed. It consists of the hardware for measurement and the software for data processing. A novel calibration method for PSP is developed and validated, which is based on the relation between intensity and pressure at the stagnation point of the impinging wall. The influences of Reynolds numbers and impingement heights between the orifice and the wall on the pressure distribution are analyzed. When the ratio value of impingement heights h/d is smaller than 6, the pressure distribution remains the same at different heights. When the value of h/d is greater than 6, the peak pressure decreases while the half width increases linearly with the increase of the impingement height. Pressure distribution curves are self-similar at different impingement heights when they are normalized by the peak pressure and half width. Further study shows that the pressure distributions are rarely influenced by the Reynolds number at the same impingement height.