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Jet formation in shock-heavy gas bubble interaction

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Abstract

The influences of the acoustic impedance and shock strength on the jet formation in shock-heavy gas bubble interaction are numerically studied in this work. The process of a shock interacting with a krypton or a SF6 bubble is studied by the numerical method VAS2D. As a validation, the experiments of a SF6 bubble accelerated by a planar shock were performed. The results indicate that, due to the mismatch of acoustic impedance, the way of jet formation in heavy gas bubble with different species is diversified under the same initial condition. With respect to the same bubble, the manner of jet formation is also distinctly different under different shock strengths. The disparities of the acoustic impedance result in different effects of shock focusing in the bubble, and different behaviors of shock wave inside and outside the bubble. The analyses of the wave pattern and the pressure variation indicate that the jet formation is closely associated with the pressure perturbation. Moreover, the analysis of the vorticity deposition, and comparisons of circulation and baroclinic torque show that the baroclinic vorticity also contributes to the jet formation. It is concluded that the pressure perturbation and baroclinic vorticity deposition are the two dominant factors for the jet formation in shock-heavy gas bubble interaction.

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Authors and Affiliations

  1. Department of Modern Mechanics, University of Science and Technology of China, 230026, Hefei, China

    Zhi-Gang Zhai, Ting Si & **-Sheng Luo

  2. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, 621900, Mianyang, China

    Li-Yong Zou

Authors
  1. Zhi-Gang Zhai
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  2. Ting Si
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  3. Li-Yong Zou
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  4. **-Sheng Luo
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Corresponding author

Correspondence to **-Sheng Luo.

Additional information

The project was supported by the National Natural Science Foundation of China (10972214 and 11172278) and the Fundamental Research Funds for the Central Universities (WK2090050014).

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Zhai, ZG., Si, T., Zou, LY. et al. Jet formation in shock-heavy gas bubble interaction. Acta Mech Sin 29, 24–35 (2013). https://doi.org/10.1007/s10409-013-0003-8

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  • DOI: https://doi.org/10.1007/s10409-013-0003-8

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