Measurement of pressure distribution in internal surface of turbo machinery by using pressure sensitive paint

Abstract

We have developed the method to apply fast-response pressure sensitive paint (PSP) to measurement of internal flows to analyze anomalous flow phenomena of internal flows of turbomachinery, and we have applied the method to measurement of pressure distribution of a casing wall surface of an axial compressor, to investigate the validity and feasibility of this method. We have clarified that the luminescence intensity is enhanced by applying the white opaque, oxygen-permeable coating composed of boron nitride (BN) nanoparticle on the PSP layer, and the qualitative pressure distribution showing pressure rises caused by rotor blades was obtained. Because uncompensated temperature influence is one of the other error sources, proper temperature compensation of PSP is needed to improve the accuracy of the pressure measurement.