Abstract
Because a fluctuating incoming flow can affect with the unstable shock train movement, a numerical study was performed to analyze the effects. For the base flow with constant incoming and downstream flow conditions, the fundamental frequency and dominant role of the first separation shock are confirmed. The oscillations of the first separation shock are not always strengthened with an increase of the excitation amplitude at the resonant frequency. It is found that with a specific amplitude, the pressure peak in the shock wave/boundary layer interaction is enhanced, which can effectively suppress the upstream movement of the separation shock. However, a further increased excitation results in a wider oscillation region and greater pressure fluctuation. The non-negligible effects of the core flow enhance the oscillation of the separation shock.
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