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首页> 外文期刊>Journal of Fluids and Structures >Effects of an axial flow component on the Honji instability
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Effects of an axial flow component on the Honji instability

机译：轴流分量对本机不稳定性的影响

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This paper is concerned with a numerical study of the three-dimensional Honji instability that can arise in an oscillatory flow impinging on a circular cylinder. It is well known that when the fluid motion far from the cylinder is perpendicular to its axis then the flow is liable to a three-dimensional breakdown via this instability which initially appears as an axially periodic mushroom-like structure attached to the surface of the cylinder. Here the focus is on examining the Honji instability under an oblique inflow. The obliqueness of the free stream is represented by an angle of attack through introducing an axial flow component. It is found that the Honji mode is suppressed by increasing the axial flow component, and when this component is sufficiently large the instability mechanism is no longer operative so that all that remains is a featureless two-dimensional columnar flow. At smaller values of angle of attack, though the Honji structure remains, it is deformed by the axial flow component. The developed two-layer near-cylinder vortical structures can be related to the energy and momentum transfer between the two layers.
机译：本文涉及对撞击圆柱体的振荡流中可能产生的三维本机不稳定性的数值研究。众所周知，当远离圆柱体的流体运动垂直于圆柱体的轴线时，由于这种不稳定性，流体容易发生三维分解，这种不稳定性最初表现为附着在圆柱体表面的轴向周期性蘑菇状结构。 。这里的重点是检查斜流下的本机不稳定性。通过引入轴向流分量，自由流的倾斜度由迎角表示。可以发现，通过增加轴向流量分量可以抑制Honji模式，并且当该分量足够大时，不稳定机制将不再起作用，因此剩下的只是二维柱状流。在较小的迎角值下，尽管保留了本机结构，但由于轴向流动分量而变形。发达的两层近圆柱涡结构可能与两层之间的能量和动量传递有关。

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