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Journal of Applied Mechanics and Technical Physics

2014 year, number 5

Mechanism of Self-Oscillations in a Supersonic Jet Impact onto an Obstacle. 2. Obstacle with no Spike

S. P. Kiselev, V. P. Kiselev, and V. N. Zaikovskii
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: overexpanded supersonic jet, obstacle, self-oscillations, shock wave


Results of the numerical solution of the problem of impingement of an overexpanded supersonic jet onto an obstacle are reported. The mass-flow-rate mechanism of self-oscillations is revealed. This mechanism consists of periodic changes in the regimes of gas inflow and outflow from the separation region to the jet around this region. It is shown that the shock-wave structure of the impinging supersonic jet exerts a significant effect on the amplitude of self-oscillations.