曲面上非定常射流分离对外流变化的响应

 曲面上射流和外流的相互作用是一个十分有趣的流动现象。控制环量翼型是这种流动应用的一个实例。近年来由于控制环量翼型在新型直升机上的有效应用,人们对曲面上射流和外流的相互作用作了许多研究。在此基础上发展了这种翼型的气动力计算方法。但至今这些工作只限于定常流动。翼面上引出射流这一概念在实际应用中往往涉及非定常流动。例如应用于直升机旋翼时,翼型主要工作于非定常流中。

THE SEPARATION OF A WALL JET ON CURVED SURFACE AND ITS RESPONSE TO UNSTEADY OUTER FLOW

The paper studies the unsteady separation of a wall jet on a curved surface and the response of the separation to the oscillations of the outer flow and jet strength through numerically solving the boundary layer equations. Results show that the separation point of the wall jet appears to be stationary as the oscillation frequency increases, and that the separation movement of the wall jet on a circulation-control airfoil can be calculated under quasi-steady state approximation when frequency is not very high.