Measurement of Surface Pressure Field of Turbocharger Impeller Using Pressure and Temperature Sensitive Paints

摘要: A pressure-sensitive paint (PSP) technique is developed for measuring the pressure profile of an automotive compressor impeller at various rotational speeds. Short-exposure images from a digital high-speed camera were used for pressure measurements to prevent image blurring due to high rotational speeds. The pressure was calculated by the two-gate lifetime method using the intensity ratio of two images during PSP dye excitation. Temperature correction of the PSP signal was performed using a temperature-sensitive paint (TSP). Polyurethane resin was used as a binder to improve the heat resistance of the PSP and TSP. Pressure and temperature distributions at the impeller surface were obtained at four speeds when the efficiency was maximum at each speed. Characterization of the paint confirms that this PSP technique provides sufficiently high sensitivity and large emission intensity in the …