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Mode transition and oscillation suppression in supersonic cavity flow

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Abstract

Supersonic flows past two-dimensional cavities with/without control are investigated by the direct numerical simulation (DNS). For an uncontrolled cavity, as the thickness of the boundary layer declines, transition of the dominant mode from the steady mode to the Rossiter II mode and then to the Rossiter III mode is observed due to the change of vortex-corner interactions. Meanwhile, a low frequency mode appears. However, the wake mode observed in a subsonic cavity flow is absent in the current simulation. The oscillation frequencies obtained from a global dynamic mode decomposition (DMD) approach are consistent with the local power spectral density (PSD) analysis. The dominant mode transition is clearly shown by the dynamic modes obtained from the DMD. A passive control technique of substituting the cavity trailing edge with a quarter-circle is studied. As the effective cavity length increases, the dominant mode transition from the Rossiter II mode to the Rossiter III mode occurs. With the control, the pressure oscillations are reduced significantly. The interaction of the shear layer and the recirculation zone is greatly weakened, combined with weaker shear layer instability, responsible for the suppression of pressure oscillations. Moreover, active control using steady subsonic mass injection upstream of a cavity leading edge can stabilize the flow.

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Correspondence to Dejun Sun.

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Project supported by the National Natural Science Foundation of China (Nos. 11232011 and 11402262), the 111 Project of China (No. B07033), the China Postdoctoral Science Foundation (No. 2014M561833), and the Fundamental Research Funds for the Central Universities

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Zhang, C., Wan, Z. & Sun, D. Mode transition and oscillation suppression in supersonic cavity flow. Appl. Math. Mech.-Engl. Ed. 37, 941–956 (2016). https://doi.org/10.1007/s10483-016-2095-9

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  • DOI: https://doi.org/10.1007/s10483-016-2095-9

Keywords

Chinese Library Classification

2010 Mathematics Subject Classification

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