Numerical Analysis on Shock Waves Influence Generated by Supersonic Jet Flow According to Working Fluids

작동유체에 따른 초음속 제트유동에 의해 생성되는 충격파 영향에 관한 수치해석

  • 정종길 (가천대학교 대학원 기계공학과) ;
  • 윤준규 (가천대학교 기계공학과) ;
  • 임종한 (가천대학교 기계공학과)
  • Received : 2016.04.28
  • Accepted : 2016.07.07
  • Published : 2016.07.31


Supersonic jet technology using high pressures has been popularly utilized in diverse industrial and engineering areas related to working fluids. In this study, to consider the effects of a shock wave caused by supersonic jet flow from a high pressure pipe, the SST turbulent flow model provided in the ANSYS FLUENT v.16 was applied and the flow characteristics of the pressure ratio and Mach number were analyzed in accordance with the working fluids (air, oxygen, and hydrogen). Before carrying out CFD (Computational Fluid Dynamics) analysis, it was presumed that the inlet gas temperature was 300 K and pressure ratio was 5 : 1 as the boundary conditions. The density function was derived from the ideal gas law and the viscosity function was derived from Sutherland viscosity law. The pressure ratio along the ejection distance decreased more in the lower density working fluids. In the case of the higher density working fluids, however, the Mach number was lower. This shows that the density of the working fluids has a considerable effect on the shock wave. Therefore, the reliability of the analysis results were improved by experiments and CFD analysis showed that supersonic jet flow affects the shock wave by changing shape and diameter of the jet, pressure ratio, etc. according to working fluids.


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