Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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The Study of Prediction Method of Cavity Shape Considering Both Gravity Effect and Angle of Attack of Cavitator

중력효과 및 캐비테이터 받음각 고려 공동 형상 예측기법 연구

  • Kim, Minjae (The 6th Research and Development Institute, Agency for Defense Development) ;
  • Yi, Jongju (The 6th Research and Development Institute, Agency for Defense Development) ;
  • Kim, Sunbum (The 6th Research and Development Institute, Agency for Defense Development)
  • 김민재 (국방과학연구소 제6기술연구본부) ;
  • 이종주 (국방과학연구소 제6기술연구본부) ;
  • 김선범 (국방과학연구소 제6기술연구본부)
  • Received : 2017.08.25
  • Accepted : 2018.02.23
  • Published : 2018.04.05
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Abstract

In this study, we develop a prediction method of cavity shape taking gravity effect and angle of attack of cavitator into consideration simultaneously. Logvinovich's theoretical formulas are superimposed to predict the change of cavity centerline due to both gravity effect and angle of attack of cavitator. It is found that as the angle of attack of cavitator increases, the gravity effect is weakened due to decrease in cavity volume, and even in case of the same angle of attack, cavity shape changes in different ways depending on whether the angle of attack of cavitator is positive or negative. We conclude that cavity shapes are largely affected by the angle of attack of cavitator, and the gravity effect and angle of attack of cavitator should be considered at the same time for the prediction of cavity shape.

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References

  1. Garabedian, P. R., “Calculation of Axially Symmetric Cavities and Jet,” Pac. J. Math, Vol. 6, No. 4, pp. 611-684, 1956. https://doi.org/10.2140/pjm.1956.6.611
  2. H. Reichardt, "The Laws of Cavitation Bubbles at Axially Symmetric Bodies in a Flow," MAP Reports and Translations No. 766, 1946.
  3. G. V. Logvinovich, "Hydrodynamics of Free-Boundary Flows," Halsted Press, Moscoba, pp. 103-126, 1973.
  4. R. L. Waid, "Cavity Shapes for Circular Disks at Angles of Attack," California Institute of Technology, California, 1957.
  5. Morris W. Self, John F. Ripken, "Steady-State Cavity Studies in a Free Jet Water Tunnel," Office of Naval Research, 1955.
  6. Savchenko, Yu. N. "Experimental Study of High Speed Cavitated Flow," Iny. J. of Fluid Mechanics Research, Vol. 26, No. 3, pp. 365-374, 1999. https://doi.org/10.1615/InterJFluidMechRes.v26.i3.80
  7. Zhang Xue-wei, Wei Ying-jie, Zhang Jia-zhong, Wang Cong, Yu Kai-ping, “Experimentail Reasearch on the Shape Characters of Natural and Ventilated Supercavitation,” Journal of Hydrodynamics, Vol. 19, No. 5, pp. 564-571, 2007. https://doi.org/10.1016/S1001-6058(07)60154-1
  8. Birkoff, G., Zarantonello, E. H., "Jets, Wakes and Cavities," Academic Press Inc. Publishers, New York, 1957.
  9. Vladimir N. Semenko, "Artificial Supercavitation. Physics and Calculation," RTO AVT Lecture Series, ADP012080, 2001.