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

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Empirical Analysis Research on Waterdrop's Deformation by Shock Wave

충격파에 의한 물방울의 변형에 관한 경험적 해석 연구

  • Hong, Yun Ky (The 4th Research and Development Institute, Agency for Defense Development) ;
  • Yeom, Geum Su (School of Mechanical and Automotive Engineering, Kunsan National University) ;
  • Moon, Kwan Ho (The 4th Research and Development Institute, Agency for Defense Development)
  • 홍윤기 (국방과학연구소 제4기술연구본부) ;
  • 염금수 (군산대학교 기계자동차공학부) ;
  • 문관호 (국방과학연구소 제4기술연구본부)
  • Received : 2016.02.15
  • Accepted : 2016.09.23
  • Published : 2016.10.05
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Abstract

In this research, theoretical study on empirical analysis method to estimate waterdrop's deformation by shock wave is presented. Flow field is calculated using theoretical and empirical relations. Waterdrop's deformation including movement, size, mass, and orientation is modeled using empirical relations derived from existing experimental data. Developed method is applied to specific flight examples with arbitrary flight speed and vehicle's configuration. The flight speed is assumed to Mach number of 2 and 4. The diameter of waterdrop is varied from 1 to 5 mm. Waterdrops along the stagnation line in front of hemispherical nose with the radius of 50 mm and around a cone-shaped side wall with the half angle of 20 degree are considered. It is found that the maximum diameter of the waterdrop is increased up to 2.77 times the initial diameter. The mass is conserved more than 66.7 %. In the case of a cone-shaped side wall, waterdrop's orientation angles defined from the flight direction when the Mach number is 2 and 4 are calculated as 33.0 and 25.6 degree, respectively.

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References

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