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首页> 外文期刊>Journal of aerospace engineering >Passive Jet Flow Control Method for Suppressing Unsteady Vortex Shedding from a Circular Cylinder
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Passive Jet Flow Control Method for Suppressing Unsteady Vortex Shedding from a Circular Cylinder

机译：抑制圆柱体不稳定涡旋脱落的被动射流控制方法

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A numerical simulation is performed to investigate a passive jet flow control method for suppressing the alternating vortex shedding from the circular cylinder. A hollow pipe is tightly set on the circular cylinder, and two arrangement cases for the holes are employed: one is a five-hole case, which means that five suction holes are set near the front stagnation point and five jet holes set near the rear stagnation point of the cylinder. The other is the full-hole case, which means the holes are equidistantly arranged on the hollow pipe. The incoming flow enters the suction holes and jets into the near wake from the outlet holes. Consequently, the wake vortex shedding alternately is manipulated or destroyed. The numerical simulations of baseline cases (without control) are first conducted to verify the reliability of the numerical model. Next, the two controlled cases (five hole-case and full-hole case) are investigated at the Reynolds number R = 10(3)-10(5). It is found that a remarkable mitigation for the aerodynamic forces of the cylinder is revealed at the high Reynolds number: the in-line drag coefficient can be reduced by approximately 40.00%. At the same time, the cross-flow lift fluctuation has been completely suppressed with a control effectiveness of more than 98.00%. The swirling strength distributions and corresponding streamline results around the circular cylinder are then described, which are employed to present the essential physics regarding why the unsteady vortex shedding is suppressed by the passive control method. Finally, the stability of the flow field is discussed based on the linear stability theory. The absolute instability region near the cylinder shrinks substantially at the high Reynolds number, even changing into a convective instability region completely for the five-hole cases. (C) 2016 American Society of Civil Engineers.
机译：进行了数值模拟，以研究用于抑制交替涡流从圆柱体脱落的被动射流控制方法。将空心管紧紧地固定在圆柱体上，并使用两个孔的布置盒：一个是五孔盒，这意味着在前停滞点附近设置五个吸入孔，在后滞点附近设置五个喷射孔。圆柱的停滞点。另一个是全孔外壳，这意味着孔等距排列在空心管上。进入的水流进入吸入孔，并从出口孔喷入近尾。因此，交替操纵或破坏尾流涡流脱落。首先进行基线案例的数值模拟（无控制）以验证数值模型的可靠性。接下来，以雷诺数R = 10（3）-10（5）研究两个受控情况（五个孔情况和全孔情况）。发现在高雷诺数下，气缸的空气动力显着减轻：轴向阻力系数可降低约40.00％。同时，横流升程波动已被完全抑制，控制效率超过98.00％。然后描述了绕圆柱体的回旋强度分布和相应的流线结果，这些结果被用来介绍关于为什么通过被动控制方法抑制不稳定涡旋脱落的基本物理原理。最后，基于线性稳定性理论讨论了流场的稳定性。圆柱附近的绝对不稳定区域在高雷诺数时会大幅收缩，甚至对于五孔情况完全变为对流不稳定区域。 （C）2016年美国土木工程师学会。

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