| Citation: | WANG Chao, DONG Xiucheng, GU Shifu, et al. Velocity decoupling of fluorescent oil film based on resection[J]. Journal of Aerospace Power, 2025, 40（3）：20230332 doi: 10.13224/j.cnki.jasp.20230332
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The model vibration in wind tunnel test may easily lead to the coupling of oil flow velocity, while the traditional optical flow method cannot identify or eliminate the vibration. Therefore, an optical flow decoupling algorithm based on resection was proposed. The low resolution optical flow value solved by the interpolated image correlation method was taken as the iterative initial value of the optical flow. Then, based on the resection, a calculation model for vibration angle and displacement under vibration conditions was derived, and then the vibration displacement was eliminated to achieve speed decoupling. The simulation test showed that the AEEs （average endpoint errors） of the traditional optical flow method and the optical flow decoupling algorithm were 0.20, 0.98, 1.44, 1.63 pixel/s and 0.19, 0.20, 0.22, 0.27 pixel/s, respectively, at the simulated vibration angles of 0°, 5°, 10° and 15°, and the measurement error of vibration angle was less than 0.1°; the fluorescence oil flow test further indicated that the velocity field streamline obtained by the optical flow decoupling algorithm based on rear intersection was more accurate, smooth and clearer, which can effectively solve the velocity coupling problem. This method has certain practical engineering application value.
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