Abstract

Possibilities of controlling the stability limit position in the spherical Couette flow are experimentally investigated. The rotational rate of the inner sphere periodically varies with respect to a nonzero average value, and the outer sphere remains motionless. The same as with steady-state rotation, the instability in the form of traveling azimuthal waves is caused by an increase in the average rotational rate. The flow velocity is measured by a laser Doppler anemometer. It is shown that the flow can be both destabilized and stabilized, depending on the modulation amplitude, when the modulation frequency approaches the eigenfrequency of the linear mode.

中文翻译：

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转速调制下流动稳定极限的位移

摘要

实验研究了控制球形Couette流中的稳定极限位置的可能性。内球的旋转速率相对于非零平均值定期变化，并且外球保持静止。与稳态旋转相同，传播的方位角波形式的不稳定性是由平均旋转速率的增加引起的。流速通过激光多普勒风速计测量。结果表明，当调制频率接近线性模式的本征频率时，取决于调制幅度，流量既可以不稳定也可以稳定。