Abstract
The effects of a forward facing cavity on the unsteady behaviors of the hypersonic type IV shock interaction on a circular cylinder are investigated both experimentally and numerically. The results show that the flow behaves to be either steady or unsteady depending on the supersonic jet impingement location. Under the conditions within the current work, two different oscillation modes, namely high frequency forward-backward oscillation and low frequency up-down oscillation modes are observed. The numerical results agree fairly well with that of the experiments, which helps to make further analysis for the mechanisms of the oscillation phenomena. The interference between the supersonic jet and the forward facing cavity plays a key role in the shock wave oscillations. Experimental results of cylinders with different length-to-diameter ratios of 4.3, 2.7 and 1.7 show that the three-dimensional effects are significant on the oscillation frequency.
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