Boundary-layer transition on a rotating cone in axial flow
Boundary-layer transition on a rotating cone in axial flow
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DOI：
10.1017/s002211208300275x
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发表时间：
1983-02
影响因子：
3.7
通讯作者：
R. Kobayashi;Y. Kohama;M. Kurosawa
中科院分区：
文献类型：
--
作者：
R. Kobayashi;Y. Kohama;M. Kurosawa
本文研究了轴向外流中沿着30°旋转锥的三维边界层层流-湍流过渡区的结构。螺旋涡，这是假定为小扰动在本稳定性分析，实验观察到的过渡区。过渡到湍流边界层的过程是可视化的细节。当转速与外部轴向流的比值增大时，临界雷诺数和过渡雷诺数显著减小。随着转速比的增大，螺旋角减小，锥上出现的旋涡数量减少。
The purpose of the present paper is to investigate the structure of the laminar–turbulent transition region for the three-dimensional boundary layer along a 30° cone rotating in external axial flow. Spiral vortices, which were assumed as small disturbances in the present stability analysis, are observed experimentally in the transition region. The process of transition to a turbulent boundary layer is visualized in detail. When the ratio of rotational speed to external axial flow is increased, the critical and transition Reynolds numbers decrease remarkably. The spiral angle and the number of vortices appearing on the cone decrease as the rotational speed ratio is increased.