Technical Physics Letters
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- 2022
Suppression of the flow instability by random fluctuations of the rotational velocity
Zhilenko D. Yu.
1, Krivonosova O. E.
1
1Institute of Mechanics, Lomonosov Moscow State University, Moscow, Russia
Email: jilenko@imec.msu.ru, olga@imec.msu.ru
The possibilities of suppression of the flow instability in a spherical gap by the noise - random fluctuations of the internal sphere rotation velocity in time - have been investigated experimentally. Fluctuations with zero mean value were added to the constant mean rotation velocity. It is found that noise can suppress instability in the form of running azimuthal waves, with a transition to a long-lasting stationary flow after the noise is turned off. Significant differences were found in the interaction of azimuthal modes in suppressing instability by periodic and random in time fluctuations of rotation speed. Keywords: noise, instability control, spherical Couette flow.
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