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Shock Standoff Distance over Spheres in Unsteady Flows

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30th International Symposium on Shock Waves 1

Abstract

The current paper discusses the shock standoff distance over spheres in unsteady flows. In a ballistic range, spherical projectiles were launched into atmospheric air for wide transonic ranges of projectile Mach numbers. We visualized shock standoff distances of 40 mm diameter spheres with double-exposure holographic interferometry and those of 10 mm diameter spheres with direct shadowgraph by using a high-speed video camera. It was confirmed that shock standoff distances tend to increase with reducing the projectile Mach number. We also confirmed that the bow shocks exist even in front of the subsonic spheres, and their detachment distances increase with decreasing the projectile speeds to low subsonic ones.

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References

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Author information

Authors and Affiliations

  1. Nihon University, Tokyo, Japan

    T. Kikuchi

  2. Emeritus Tohoku University, Sendai, Japan

    Kazuyoshi Takayama

  3. RAFAEL, Aerodynamics Group, P.O.B. 2250, Haifa, 31021, Israel

    Dan Igra

  4. Institute of Mathematics, The Hebrew University of Jerusalem, Jerusalem, Israel

    J. Falcovitz

Authors
  1. T. Kikuchi
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  2. Kazuyoshi Takayama
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  3. Dan Igra
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  4. J. Falcovitz
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Corresponding author

Correspondence to Dan Igra .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel

    Gabi Ben-Dor

  2. Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel

    Oren Sadot

  3. Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel

    Ozer Igra

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Kikuchi, T., Takayama, K., Igra, D., Falcovitz, J. (2017). Shock Standoff Distance over Spheres in Unsteady Flows. In: Ben-Dor, G., Sadot, O., Igra, O. (eds) 30th International Symposium on Shock Waves 1. Springer, Cham. https://doi.org/10.1007/978-3-319-46213-4_45

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  • DOI: https://doi.org/10.1007/978-3-319-46213-4_45

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-46211-0

  • Online ISBN: 978-3-319-46213-4

  • eBook Packages: EngineeringEngineering (R0)

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