Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of the Length and Diameter of Shock Tube on the Shock Train Phenomenon

충격파관의 길이와 직경이 Shock Train 현상에 미치는 영향

  • Kim, Dong Wook (Dept. of Mechanical Engineering, Andong Nat'l Univ.) ;
  • Kim, Tae Ho (Dept. of Mechanical Engineering, Andong Nat'l Univ.) ;
  • Yoon, Young Bin (Dept. of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.) ;
  • Kim, Heuy Dong (Dept. of Mechanical Engineering, Andong Nat'l Univ.)
  • 김동욱 (안동대학교 기계공학과) ;
  • 김태호 (안동대학교 기계공학과) ;
  • 윤영빈 (서울대학교 기계항공공학부) ;
  • 김희동 (안동대학교 기계공학과)
  • Received : 2017.04.03
  • Accepted : 2017.06.27
  • Published : 2017.09.01
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Abstract

A normal shock wave is initially formed in the shock tube that migrates towards the closed end of the tube, which, in turn, leads to the reflection of shock. Due to the interaction of the reflected shock with the boundary layer, bifurcation of the shock wave takes place. A shock train will be generated after the bifurcated shock wave approaches the contact surface. Until now, only a few studies have been conducted to investigate this shock train phenomenon inside the shock tube. For the present study, a CFD analysis has been performed on a two dimensional axisymmetric model of a shock tube using unsteady, compressible Navier-Stokes equations. In order to investigate the detailed characteristics of the shock train phenomenon, quantitative studies have been performed by varying shock tube length, diameter under fixed diaphragm, and pressure ratio inside a shock tube.

충격파관에서 발생하는 충격파는 저압관단으로 전파하며, 관단에서 반사한다. 반사 충격파와 경계층의 간섭으로 반사 충격파에 분지가 발생하게 되고, 분지한 반사 충격파는 접촉면과 간섭하며, shock train이 발생하게 된다. 그러나 충격파관에서 발생하는 shock train 현상에 대한 연구는 미흡한 실정이다. 본 연구에서는 2차원 축대칭 충격파관을 사용하여 비정상, 압축성 Navier-Stokes 방정식을 적용한 수치해석을 수행하였으며, shock train의 상세한 특성을 조사하기 위하여, 고정된 압력비에서 충격파관의 길이 및 직경을 변화시켰다.

Keywords

References

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