Wind Tunnel Technology Center, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA)
Wind Tunnel Technology Center, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA)
Wind Tunnel Technology Center, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA)
Wind Tunnel Technology Center, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (JAXA)
This report presents a detailed description for the development of a computer program to correct self-illumination effects in pressure-sensitive paint measurements for use in the JAXA wind-tunnel testing. It has been found that the effects of reflected light in luminescent paint measurements can be corrected reasonably by applying techniques developed in the fields of radiative transfer and computer graphics, provided that the painted surface may be treated as a diffuse reflector. The implementation of the calculation of form factors that can handle occlusions between two surface elements is described in detail. Emphasis is placed on specific treatments that are needed to improve accuracy and minimize storage requirements. We first applied the technique to a calibration test for a simple saw-teeth model, and it was shown that the present program can sufficiently remove the measurement errors induced by the reflected light. The program was also applied to test data obtained in JAXA 6.5 m x 5.5 m low-speed wind tunnel using a semispan model with high-lift devices, and the corrected results as well as problems for the application of the present technique in industrial wind-tunnel tests are presented and discussed.
感圧塗料計測法Self-Illumination補正プログラムの開発
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