荧光油膜技术及其在流动控制中的应用

摘要

研究了运用荧光油膜技术测量全局表面摩擦应力的方法，引入金字塔迭代技术和模拟演化技术提出了该方法的优化求解算法，并通过平板绊线实验对以上方法进行了验证。以此为基础，通过两个典型的流动控制实验进一步探讨了荧光油膜技术在流动控制中的应用，其中包括采用不同参数锯齿形转捩带控制平板流动转捩的被动流动控制实验和不同激励频率下的后台阶零质量射流主动流动控制实验。以上实验测量结果表明，荧光油膜方法能够有效帮助理解流动机理并可用于评估流动控制策略。%The paper describes the fluorescence oil-film technique for global skin friction measurement and its application in flow control.The theory of the fluorescence oil-film technique is introduced,and the pyramid iterative evolution method is proposed in order to accelerate convergence and improve the accuracy of solution.Two flow control experiments are carried out,including a passive control for boundary layer transition and an active control of flow over a backward-facing step (BFS).In boundary layer transition experiment,three types of the zigzag top angle (namely:30°,60°and 90°)are done in order to achieving optimum artificial boundary layer transition.In BFS experiment,three actuation frequency (namely:0Hz,35Hz and 50Hz)are done in order to comparing the control effect of different actuation frequencies The results are useful for better understanding of the flow physics and assessing the flow control strategies.