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首页> 外文期刊>Journal of Heat Transfer >Influence of Thermal Buoyancy on Vortex Shedding Behind a Rotating Circular Cylinder in Cross Flow at Subcritical Reynolds Numbers
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Influence of Thermal Buoyancy on Vortex Shedding Behind a Rotating Circular Cylinder in Cross Flow at Subcritical Reynolds Numbers

机译：热浮力对亚临界雷诺数下横流中旋转圆柱体后涡旋脱落的影响

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摘要

The vortex shedding (VS) behind stationary bluff obstacles in cross-flow can be initiated by imposing thermal instability at subcritical Reynolds numbers (Re). We demonstrate here that additional thermal instability is required to be imparted in the form of heating for destabilizing the flow around a rotating bluff obstacle. A two-dimensional numerical simulation is performed in this regard to investigate the influences of cross buoyancy on the VS process behind a heated and rotating circular cylinder at subcritical Re. The flow is considered in an unbounded medium. The range of Re is chosen to be 5-45 with a dimensionless rotational speed (Ω) ranging between 0 and 4. At this subcritical range of Reynolds number the flow and thermal fields are found to be steady without the superimposed thermal buoyancy (i.e., for pure forced flow). However, as the buoyancy parameter (Richardson number, Ri) increases flow becomes unstable and subsequently, at some critical value of Ri, periodic VS is observed to characterize the flow and thermal fields. The rotation of the cylinder is found to have a stabilizing effect and as Ω increases more heating is observed to be required to destabilize the flow.
机译：可以通过在亚临界雷诺数（Re）处施加热不稳定性来引发横流中固定钝角障碍物后面的涡旋脱落（VS）。我们在这里证明，需要以加热的形式赋予额外的热不稳定性，以使旋转的钝壁障碍物周围的流动不稳定。在这方面进行了二维数值模拟，以研究交叉浮力对亚临界温度Re加热和旋转的圆柱体后的VS过程的影响。在无限制的介质中考虑流。 Re的范围选择为5-45，无因次转速（Ω）在0到4之间。在此雷诺数的亚临界范围内，发现流场和热场稳定，没有叠加的热浮力（即，纯强制流动）。但是，随着浮力参数（理查森数，Ri）增加，流量变得不稳定，随后，在Ri的某个临界值处，观察到周期性VS来表征流场和热场。发现圆柱体的旋转具有稳定作用，并且随着Ω的增加，观察到需要更多的热量来使流量不稳定。

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