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运用数值方法,研究了展向分布的倾斜微型射流列对平板湍流边界层的作用,验证了利用微型射流列产生流向涡列来进行边界层控制的可行性,并分析了射流列各主要参数对控制作用的影响。当各射流同向倾斜时,顺射流倾斜方向流向涡控制作用逐个减弱;当相邻射流反向倾斜时,流向涡列在较大流向区域内对边界层形成较均匀的控制。随射流间距减小,流向涡列初始控制作用增强,但流向控制区域减小。在射流速度较小情况下,随射流速度提高,流向涡列控制作用增强;但过高的射流速度会导致流向涡列穿透边界层,反而导致控制作用下降。采用俯仰角较小(一般小于30°)、倾斜角较大(一般大于60°)的微型射流列对流向涡列控制作用有利。
The numerical method is used to study the effect of the obliquely distributed micro jet series on the turbulent boundary layer. The feasibility of using the micro jet series to generate the flow direction vortex for the boundary layer control is verified. The main parameters of the jet series The effect of control. When the jets collide with each other in the same direction, the control of the direction of vortex along the direction of the jet decreases one by one. When the adjacent jet tilts in the opposite direction, the flow vortex forms a more uniform control over the boundary layer in the larger flow direction. As the jet spacing decreases, the initial control of the flow vortex enhances, but the flow control region decreases. When the jet velocity is small, the effect of the flow vortex control is enhanced with the increase of the jet velocity. However, the jet velocity is too high to cause the flow vortices to penetrate the boundary layer, but the control effect decreases. Micro jet arrays with smaller pitch angles (generally less than 30 °) and large tilt angles (generally greater than 60 °) are beneficial for the control of flow vortices.