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Time resolved flow field measurements of orifice entrainment during a hydrodynamic ram event

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Abstract

The gaseous cavity resulting from a hydrodynamic ram (HRAM) event in a fluid-filled tank is composed of entrained ambient gases and vaporized local fluid. However, the relative composition during initial cavity formation requires additional research. By measuring and studying the entrained flow through the projectile penetration orifice, calculations to aide in determining the relative composition of entrained gases and vaporized fluid are achieved. Additionally, qualitative assessments on how orifice mass flow correlates with internal cavity dynamics are possible. To complete the measurement, a technique to capture the time-resolved flow field at projectile impact velocities ranging from 100 to 180 m/s is needed. The developed technique utilizes non-invasive diagnostics to include high-speed digital imagery and a continuous wave laser in conjunction with particle image streak analysis to visualize and measure the entrained flow field.

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Acknowledgments

The authors would like to thank Dr. Goss from Innovative Scientific Solutions Inc. for the assistance in learning and utilizing the image processing tools. Additionally, we would like to thank Mr. Dennis Lindel of the Joint Aircraft Survivability Program and Mr. Josh Dewitt, Mr. Jamie Smith, and Mr. Keith Long for their assistance in experimental setup and execution.

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Authors and Affiliations

  1. Air Force Institute of Technology, WPAFB, 2950 Hobson Way, Dayton, OH, 45433, USA

    Andrew J. Lingenfelter & Mark F. Reeder

  2. Air Force Life Cycle Management Center, Eglin AFB, 207 West D Ave, Valparaiso, FL, 32542, USA

    David Liu

Authors
  1. Andrew J. Lingenfelter
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  2. David Liu
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  3. Mark F. Reeder
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Correspondence to Andrew J. Lingenfelter.

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Lingenfelter, A.J., Liu, D. & Reeder, M.F. Time resolved flow field measurements of orifice entrainment during a hydrodynamic ram event. J Vis 20, 63–74 (2017). https://doi.org/10.1007/s12650-016-0378-2

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  • DOI: https://doi.org/10.1007/s12650-016-0378-2

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