摘要
风洞试验中的模型振动易导致表面油流速度发生耦合,而传统光流法无法对振动进行识别或消除。为此,提出了基于后方交会的光流解耦算法。将插值后的图像相关法解算的低分辨率光流值作为光流法的迭代初值,然后基于后方交会推导了振动情况下振动角和振动位移的计算模型,进而消除振动位移实现速度解耦。仿真试验显示:在0°、5°、10°和15°的模拟振动角下,传统光流法和光流解耦算法的AEE(average endpoint error)分别为0.20、0.98、1.44、1.63像素/s和0.19、0.20、0.22、0.27像素/s,同时振动角测量误差小于0.1°。荧光油流试验进一步表明:基于后方交会的光流解耦算法获取的速度场流线更为准确、清晰和流畅,能够有效解决速度耦合问题,该方法具有一定的实际工程应用价值。
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.
作者
王超
董秀成
古世甫
张征宇
WANG Chao;DONG Xiucheng;GU Shifu;ZHANG Zhengyu(School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 610039,China;Sichuan University Jinjiang College,Meishan Sichuan 620860,China;High Speed Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China)
出处
《航空动力学报》
北大核心
2025年第3期228-236,共9页
Journal of Aerospace Power
基金
国家自然科学基金(11872069)
四川省中央引导地方科技发展专项(2021ZYD0034)
四威高科-西华大学产学研联合实验室(2016-YF04-00044-JH)。
关键词
振动
速度解耦
后方交会
光流法
荧光油膜
vibration
speed decoupling
resection
optical flow method
fluorescent oil film
