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Measurement techniques like pressure sensitive paint (PSP) have shown their uniqueness in the capability of larger coverage of model surface area and higher spatial resolution in the results as compared with conventional ways. The mechanism of PSP technique requires the excitation light illuminates the entire test surface, and the camera records luminescent emission from the surface. Application of PSP technique may fail on internal flows like turbine and compressor cascades when these requirements are not met, where optical access may be heavily limited due to the closely adjacent components with curvature. Such problems could only be overcome through trial and error, which could be time-consuming and requires accumulated experience. Therefore, a pre-positioning method is proposed in this work, which is based on ray-tracing simulations, to determine the arrangement of the optical components for PSP measurement system in advance. To verify the effectiveness of this method, it is used on a linear compressor cascade with large solidity. This method enables researchers to estimate the optical conditions and determine the optical devices’ setup before the real test. The results show that with arrangement determined using this method proposed, the full-field pressure on a cascade blade surface with large solidity can be acquired for PSP technique. And results obtained have better uniformity of illumination with the same devices, which is beneficial for image quality and subsequent analyses of flow phenomena.

Pre-positioning of Optical Components for Pressure Sensitive Paint Measurement Using Prior Ray-tracing Method