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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Induced parallel vortex shedding from a circular cylinder at Re of O(10(4)) by using the cylinder end suction technique
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Induced parallel vortex shedding from a circular cylinder at Re of O(10(4)) by using the cylinder end suction technique

机译：通过使用圆柱端吸力技术在Re为O（10（4））时从圆柱体诱发平行涡旋脱落

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摘要

In the present work, the objective is to attempt to induce parallel vortex shedding at a moderately high Reynolds number (=1.578 x 10(4)) by using the cylinder end suction method, and measure the associated aerodynamic parameters. We first measured the aerodynamic parameters of a single circular cylinder without end suction, and showed that the quantities measured are in good agreement with equivalent data in the published literature. Next, by using different amount of end suction which resulted in increasing the cylinder end velocity by 1%, 2% and 2.5%, we were able to show that the above corresponded to the situation of under suction, optimal suction and over suction, respectively. With optimal suction, we demonstrated that the end suction method works at Re = 1.578 x 10(4). The shape of the primary vortex shed became straighter than when there is no end suction, and parameters like cylinder surface pressure distribution, drag force per unit span, as well as vortex shedding frequency all showed negligible spanwise variation. Further careful analyses showed that when compared to the naturally existing curved vortex shedding, with parallel vortex shedding the mid-span drag per unit span became slightly smaller, but the drag averaged over the cylinder span became slightly larger. For cylinder surface pressure, it was found that cylinder end effects mainly influenced the surface pressure in the angular ranges -180 degrees <= beta < -60 degrees and 60 degrees < beta <= 180 degrees. Without end suction, the cylinder surface pressure in the above ranges was found to increase (become less negative) slightly with vertical bar z/d vertical bar, but such increase disappeared when optimal end suction was applied, and the cylinder surface pressure distribution became spanwise location independent. As for the vortex shedding frequency (Strouhal number), although the Strouhal number showed spanwise variation when there is no end suction and negligible spanwise variation when optimal suction was applied, the difference between the spanwise averaged Strouhal number was quite negligible. With under suction, the spanwise dependence of various aerodynamic parameters existed, but was found to be not as significant as when no end suction was applied at all. With over suction, the flow situation was found to be practically no change from the optimal suction situation.
机译：在目前的工作中，目标是尝试通过使用气缸端部吸气法以中等较高的雷诺数（= 1.578 x 10（4））诱导平行涡旋脱落，并测量相关的空气动力学参数。我们首先测量了没有末端吸力的单个圆柱的空气动力学参数，结果表明测量的量与已发表文献中的等效数据高度吻合。接下来，通过使用不同的端部吸力量导致气缸端部速度分别提高1％，2％和2.5％，我们可以证明上述情况分别对应于吸力不足，最佳吸力和过度吸力的情况。 。通过最佳吸力，我们证明了末端吸力方法在Re = 1.578 x 10（4）时有效。初级涡流出口的形状变得比没有端部吸力时更直，并且圆柱表面压力分布，每单位跨度的拖曳力以及涡流脱落频率等参数在跨度方向的变化都可以忽略不计。进一步的仔细分析表明，与自然存在的弯曲涡旋脱落相比，与平行涡旋脱落相比，每跨度的中跨阻力稍小，但在圆柱跨度上平均的阻力略大。对于气缸表面压力，发现气缸端部作用主要在-180度<= beta <-60度和60度

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