Abstract
This study investigated unsteady pressure measurements on a pitching OA309 airfoil at a Mach number of 0.1 using a fast-responding pressure-sensitive paint (fast PSP). Two commonly used data acquisition methods applicable to fast PSPs, namely the real-time intensity-based method and the single-shot lifetime-based method, were separately used to obtain the pressure distributions on the upper surface at a reduced pitching frequency (k = πfc/U∞) of 0.074. The signal-to-noise ratio, influences of model motion, and temperature-induced errors associated with the two methods were compared to explore the advantages and disadvantages of the methods. The real-time intensity-based method outperformed the single-shot lifetime-based method in pressure measurements on moving models with very low speeds. Flow separation and reattachment were identified according to the temporal- and spatial-resolved pressure fields obtained through the real-time intensity-based method; finally, the effects of the pitching amplitude and the leading-edge vortex generators were studied. The results showed that flow separation was postponed as the pitching amplitude increased, while flow reattachment occurred earlier on the airfoil equipped with leading-edge vortex generators.
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Acknowledgements
This work is supported by funding from the National Natural Science Foundation of China (NSFC No. 12102260 & No. 12202476) and the Gas Turbine Research Institute of Shanghai Jiao Tong University.
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Jiao, L., Shi, Z., Wei, C. et al. Fast pressure-sensitive paint measurements of dynamic stall on a pitching airfoil via intensity- and lifetime-based methods. J Vis 27, 333–352 (2024). https://doi.org/10.1007/s12650-024-00973-3
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DOI: https://doi.org/10.1007/s12650-024-00973-3