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Flow around a rotating semi-infinite cylinder in an axial stream

机译:在轴向流中围绕旋转的半无限圆柱体流动

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摘要

This paper concerns steady, high-Reynolds-number flow around a semi-infinite, rotating cylinder placed in an axial stream and uses boundary-layer type of equations which apply even when the boundary-layer thickness is comparable to the cylinder radius, as indeed it is at large enough downstream distances. At large rotation rates, it is found that a wall jet appears over a certain range of downstream locations. This jet strengthens with increasing rotation, but first strengthens then weakens as downstream distance increases, eventually disappearing, so the flow recovers a profile qualitatively similar to a classical boundary layer. The asymptotic solution at large streamwise distances is obtained as an expansion in inverse powers of the logarithm of the distance. It is found that the asymptotic radial and axial velocity components are the same as for a non-rotating cylinder, to all orders in this expansion.
机译:本文涉及绕在轴向流中的半无限旋转圆柱体周围的稳定,高雷诺数流,并使用边界层类型的方程式,即使边界层厚度与圆柱体半径相当,该方程式也适用下游距离足够大。在大的旋转速率下,发现壁射流出现在下游位置的一定范围内。该射流随着旋转的增加而增强,但随着下游距离的增加而先增强然后减弱,最终消失,因此流量在质量上恢复了与经典边界层相似的轮廓。作为距离的对数的倒数幂的扩展,获得了在较大的流向距离处的渐近解。发现在此扩展中,渐进径向和轴向速度分量与非旋转圆柱体的渐进分量相同。

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