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Experimental demonstration of bow-shock instability and its numerical analysis

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Abstract

An experimental demonstration was carried out in a ballistic range at high Mach numbers with the low specific heat ratio gas hydrofluorocarbon HFC-134a to observe the unstable bow-shock wave generated in front of supersonic blunt objects. The shadowgraph images obtained from the experiments showed instability characteristics, in which the disturbances grow and flow downstream and the wake flow appears wavy because of the shock oscillation. Moreover, the influence of the body shape and specific heat ratio on the instability was investigated for various experimental conditions. Furthermore, the observed features, such as wave structure and disturbance amplitude, were captured by numerical simulations, and it was demonstrated that computational fluid dynamics could effectively simulate the physical instability. In addition, it was deduced that the shock instability is induced by sound emissions from the edge of the object. This inference supports the dependence of the instability on the specific heat ratio and Mach number because the shock stand-off distance is affected by these parameters and limits the sound wave propagation.

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Acknowledgments

We would like to acknowledge T. Ogawa and T. Ukai for their assistance in conducting the experiments. The computations were performed on a Silicon Graphics International (SGI) Altix UV1000 at the Advanced Fluid Information Research Center, Institute of Fluid Science, Tohoku University. This work was partially supported by a Grant-in-Aid for Scientific Research under Contract No. (C) 26420099 from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Tohoku University, 6-6-01 Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8579, Japan

    Y. Kikuchi & N. Ohnishi

  2. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    K. Ohtani

Authors
  1. Y. Kikuchi
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  2. N. Ohnishi
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  3. K. Ohtani
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Corresponding author

Correspondence to N. Ohnishi.

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Communicated by A. Podlaskin.

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Kikuchi, Y., Ohnishi, N. & Ohtani, K. Experimental demonstration of bow-shock instability and its numerical analysis. Shock Waves 27, 423–430 (2017). https://doi.org/10.1007/s00193-016-0669-5

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  • DOI: https://doi.org/10.1007/s00193-016-0669-5

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