Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Water-Entry Induced Cavity Pressure

  • Lee, Min-Hyung (School of Mechanical and Aerospace Engineering, Sejong University)
  • Published : 2000.05.01
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Abstract

The pressure in a water-entry induced cavity, is analyzed up to the closed cavity (bubble). Water-entry is a highly transient phenomenon, and the evolution of the water-entry cavity must be explained by considering the entry speed, shape of the solid body, atmosphere pressure, and cavity pressure as the primary variables. This work is an extension of the cavity dynamics model recently reported by Lee (l997a). To extend the model for a wide range of entry speeds the cavity pressure is calculated from a one-dimensional quasi-steady flow model. The estimation of the cavity pressure allows us to explain the experimentally observed surface closure phenomena at low entry speeds. Predictions for the time of surface closure are compared with the published experimental data.

Keywords

References

  1. Abelson, H. I., 1969, The Behavior of the Cavity formed by a Projectile Entering the Water Vertically, The University of Maryland, Ph. D. Thesis
  2. Abelson, H. I., 1970, 'Pressure Measurements in the Water- Entry Cavity,' J. Fluid. Mech., Vol. 44, No. 1, pp. 129-144 https://doi.org/10.1017/S0022112070001738
  3. Birkhoff, G. and Isaacs, R., 1951, 'Transient Cavities in Air-Water Entry,' NAVORD Report No. 1490
  4. Birkhoff, G. and Zarantonello, F. H., 1957, Jets, Wakes, and Cavities, Academic Press, New York
  5. Charters, A. C. and Thomas, R. N., 1945, 'The Aerodynamic Performance of Small Spheres from Subsonic to High Speed Supersonic Velocities,' J. of Aeronaut. Sci. Vol. 12, p. 468
  6. Gaudet, S., 1998, 'Numerical Simulation of Circular Disks Entering the Free Surface of a Fluid,' Physics of Fluids, Vol. 10, No. 10, pp. 2489-2499 https://doi.org/10.1063/1.869787
  7. Gilbarg, D. & Anderson, R. A., 1948, 'Influence of Atmospheric Pressure on the Phenomena Accompanying the Entry of Spheres into Water,' J. of Applied Physics, Vol. 19, No.2, pp. 127-139 https://doi.org/10.1063/1.1698377
  8. Lee, M., Longoria, R. G. and Wilson, D. E., 1997a, 'Cavity Dynamics in High-Speed Water Entry,' Physics of Fluids, Vol. 9, No. 3, pp. 540-550 https://doi.org/10.1063/1.869472
  9. Lee, M., Longoria, R. G. and Wilson, D. E., 1997b, 'Ballistic Waves in High-Speed Water Entry,' J. of Fluids and Structures, Vol. 11, pp. 819-844
  10. Lundstrom, E. A., 1971, 'Fluid Dynamic Analysis of Hydraulic Ram,' Naval Weapons Center, China Lake, CA, NWC TP 5227
  11. 'Violent Surface Motion, ' Philosophical Transactions: Mathematical, Physical and Engineering Sciences, Series A Vol. 355, (1724 15), 1997 https://doi.org/10.1098/rsta.1997.0031
  12. Waugh, G. & Stubstad, G. W., 1972, Hydroballistics Modeling, Naval Underwater Center, San Diego, CA., USA.
  13. Wolfe, W. P. and Gutierrez, 1988, 'Experimental Measurements of Pressure in Water-Entry Cavities,' Cavitation and Multiphase Flow Forum, FED-Vol. 135, ASME, pp. 104-107