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Influence of the angle of incident shock wave on mixing of transverse hydrogen micro-jets in supersonic crossflow

Barzegar Gerdroodbary, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2015.04.107
  3. Publisher: Elsevier Ltd , 2015
  4. Abstract:
  5. A three-dimensional numerical study has been performed to investigate the influence of angle of shock waves on sonic transverse Hydrogen micro-jets subjected to a supersonic crossflow. This study focuses on mixing of the Hydrogen jet in a Mach 4.0 crossflow with a global equivalence ratio of 0.5. Flow structure and fuel/air mixing mechanism were investigated numerically. Parametric studies were conducted on the angle of shock wave by using the Reynolds-averaged Navier-Stokes equations with Menter's Shear Stress Transport turbulence model. Complex jet interactions were found in the downstream region with a variety of flow features depending upon the angle of shock incident. These flow features were found to have subtle effects on the mixing of Hydrogen jets. Results indicate a different flow structure than for a typical micro jet, with the development of shock angle to the flow of the Hydrogen jet. According to the results, without oblique shock, mixing occurs at a low rate. When the intersection of incident shock and the lower surface is at a low angle (15°) of shock incident; significant reduction (up to 30%) occurs in the maximum concentration of the Hydrogen jet at downstream. Moreover, when the angle of shock incident increases, Hydrogen-air mixing rate increase and the concentration of the Hydrogen micro jet is uniformly distributed. Consequently, an enhanced mixing zone occurs downstream of the injection slots which leads to flame-holding
  6. Keywords:
  7. Numerical simulation ; Transverse micro jets ; Computational fluid dynamics ; Computer simulation ; Flow structure ; Hydrogen ; Mixing ; Navier Stokes equations ; Shear flow ; Shear stress ; Shock waves ; Supersonic aircraft ; Supersonic flow ; Turbulence models ; Global equivalence ratio ; Hydrogen jets ; Incident shock ; Maximum concentrations ; Micro jet ; Reynolds Averaged Navier-Stokes Equations ; Shear-stress transport ; Three-dimensional numerical studies ; Supersonic aerodynamics
  8. Source: International Journal of Hydrogen Energy ; Volume 40, Issue 30 , August , 2015 , Pages 9590-9601 ; 03603199 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0360319915010198