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

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Numerical Analysis for Supercavitation Characteristics around Underwater Vehicle according to Ventilated Gas Temperature

분사가스 온도에 따른 수중운동체 주위 초공동 특성 분석을 위한 수치해석

  • Hwang, Hyunsung (School of Mechanical Engineering, Pusan National University) ;
  • Park, Warngyu (School of Mechanical Engineering, Pusan National University) ;
  • Nguyen, Van Tu (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Donghyun (School of Mechanical Engineering, Pusan National University) ;
  • Nguyen, Duy Trong (School of Mechanical Engineering, Pusan National University)
  • 황현성 (부산대학교 기계공학부) ;
  • 박원규 (부산대학교 기계공학부) ;
  • 김동현 (부산대학교 기계공학부) ;
  • 김동현 (부산대학교 기계공학부) ;
  • Received : 2022.01.04
  • Accepted : 2022.08.10
  • Published : 2022.10.05
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Abstract

Supercavitation is a phenomenon in which the cavity covers the entire underwater vehicle. The purpose of this paper is to compare and analyze the thermal effect on the cavity characteristics by changing the ventilated gas temperature through computational analysis. For this study, a homogeneous mixture model based on the 3D Navier-Stokes equation was used. As a phase change model, it is its own code considering both pressure change and temperature change. A dimensionless number Tm was presented to analyze the numerical results, and as the Tm increased, the cavity length increased by about 3.6 times and the cavity width by about 3.3 times at 393.15 K compared to room temperature. Analyzing these thermal effects, it was confirmed that rapid heat exchange and heat transfer between the gas phase and the liquid phase occurred at the location where the ventilated gas was sprayed, affecting the cavity characteristics. In addition, it can be confirmed that the initial cavity surface becomes unstable as the ventilated gas temperature increases, and it can be confirmed based on the numerical analysis results that the critical temperature at which the cavity surface becomes unstable is 373.15 K.

Keywords

Acknowledgement

이 과제는 부산대학교 기본연구지원사업(2년)에 의하여 연구되었음.

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