On the generation of helical waves in circular pipe flow
On the generation of helical waves in circular pipe flow
复制标题
圆管流中螺旋波的产生
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
M. Landman
中科院分区：
文献类型：
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作者：
M. Landman
讨论了流体在圆管内流动时存在螺旋波的问题。在仅受轴向压力梯度强迫的管道流动的情况下，直接模拟没有发现任何自维持的螺旋波。通过线性稳定性计算和强制基本流的直接模拟，研究了残余旋流对进口流的影响。结果在性质上与旋转管道中的流动相似，其中已知存在稳定的螺旋波。这些结果表明，残余旋转可能是引发圆管流动层流-湍流转变的重要机制。
The question of the existence of helical waves in fluid flow through a circular pipe is discussed. In the case of pipe flow forced only by an axial pressure gradient, direct simulations have failed to find any self‐sustaining helical waves. The effect of residual swirl in the inlet flow is investigated, by performing linear stability calculations and direct simulations of a forced basic flow. The results are qualitatively similar to that of flow in a rotating pipe, in which stable helical waves are known to exist. These results suggest that residual rotation may be an important mechanism in triggering laminar‐turbulent transition in circular pipe flow.