Acta Mechanica Sinica

, Volume 20, Issue 4, pp 374–382 | Cite as

Underwater acoustics and cavitating flow of water entry

  • Shi Honghui
  • Kume Makoto


The fluid mechanics of water entry is studied through investigating the underwater acoustics and the supercavitation. Underwater acoustic signals in water entry are extensively measured at about 30 different positions by using a PVDF needle hydrophone. From the measurements we obtain (1) the primary shock wave caused by the impact of the blunt body on free surface; (2) the vapor pressure inside the cavity; (3) the secondary shock wave caused by pulling away of the cavity from free surface; and so on. The supercavitation induced by the blunt body is observed by using a digital high-speed video camera as well as the single shot photography. The periodic and 3 dimensional motion of the supercavitation is revealed. The experiment is carried out at room temperature.

Key Words

water entry underwater acoustics supercavitation PVDF hydrophone high-speed photography 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Shi HH. Fast water entry of blunt solid projectile. In: Proc 74th JSME Spring Ann Meeting, Tokyo, 1997, 6: 1–4Google Scholar
  2. 2.
    Shi HH, Itoh M, Takami T. Optical observation of the supercavitation induced by high-speed water entry.Trans ASME, J Fluids Engng, 2000, 122(4): 806–810Google Scholar
  3. 3.
    Shi HH, Kume M. An experimental research on the flow field of water entry by pressure measurements.Phys Fluids, 2001, 13(1): 347–349CrossRefGoogle Scholar
  4. 4.
    Shi HH, Takami T. Hydrodynamic behavior of an underwater moving body after water entry.Acta Mechanica Sinica, 2001, 17(1): 35–44CrossRefGoogle Scholar
  5. 5.
    Shi HH, Takami T. Some progress in the study of the water entry phenomenon.Experiments in Fluids, 2001, 30(4): 475–477CrossRefGoogle Scholar
  6. 6.
    Shi HH, Takami T, Itoh M. Measurement of the under-water acoustic field in water entry of blunt body.Exp Meas Fluid Mech, 2001, 15(2): 78–84 (in Chinese)Google Scholar
  7. 7.
    Hrubes JD. High-speed imaging of supercavitating underwater projectile.Experiments in Fluids, 2001, 30(1): 57–64CrossRefGoogle Scholar
  8. 8.
    May A. Vertical entry of missiles into water.J Appl Phys, 1952, 23(12):1362–1372CrossRefGoogle Scholar
  9. 9.
    Knapp RT, Daily JW, Hammitt FG. Cavitation. New York: McGraw-Hill, 1970. 153–217Google Scholar
  10. 10.
    Leslie CB. Underwater noise produced by bullet entry.J Acoust Soc Am, 1964, 36(6):1138–1144MathSciNetCrossRefGoogle Scholar
  11. 11.
    Korobkin A. Blunt-body impact on compressible liquid.J Fluid Mech, 1994, 263: 319–342MathSciNetCrossRefGoogle Scholar

Copyright information

© Chinese Society of Theoretical and Applied Mechanics 2004

Authors and Affiliations

  • Shi Honghui
    • 1
    • 2
  • Kume Makoto
    • 3
  1. 1.State Key Laboratory of Nonlinear Mechanics, Institute of MechanicsChinese Academy of SciencesBeijingChina
  2. 2.College of Mechanical Engineering and Automatic ControlZhejiang University of SciencesHangzhouChina
  3. 3.Department of Mechanical EngineeringNagoya Institute of TechnologyNagoyaJapan

Personalised recommendations