Application of PSP technique to pressure measurement on cascade surface

Pressure Sensitive Paint measurement technique is well known for its advantage by more and more attraction: global surface static pressure measurement without changing aerodynamics configuration on the model surface. Due to the limited space and complex flow field, it is very difficult to apply PSP to the turbomachinery blade. In the present paper, lots of PSP calibrations are performed to grasp the characteristic of the measurement system, which is produced from ISSI, and static pressure measurements using both PSP and pressure scanner are carried out on the NWPU cascade wind tunnel in order to obtain the pressure distribution on the blade suction and compare the difference between two pressure measurement techniques quantitively. We conclude from the results that: (1) there is the influence on the calibrating curve of the characteristic of the measurement system, (2) the size of the measurement system is critical to the PSP measurement on the turbomachinery: the smaller the size of the measurement system, the more convenient the arrangement of the light path, (3) images of pressure distributions on three Mach number are smooth with little noise and the difference between both results using PSP and pressure scanner measurement technique is less than 4.4%.