Numerical study of the oscillations induced by shock/shock interaction in hypersonic double-wedge flows |
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Authors: | Z M Hu R S Myong C Wang T H Cho Z L Jiang |
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Institution: | (1) Research Center for Aircraft Parts Technology, School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju, 660-701, South Korea;(2) LHD, Institute of Mechanics, Beijing, 100080, China |
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Abstract: | In this paper, the shock pattern oscillations induced by shock/shock interactions over double-wedge geometries in hypersonic
flows were studied numerically by solving 2D inviscid Euler equations for a multi-species system. Laminar viscous effects
were considered in some cases. Temperature-dependent thermodynamic properties were employed in the state and energy equations
for consideration of the distinct change of the thermodynamic state. It was shown that the oscillation results in high-frequency
fluctuations of heating and pressure loads over wedge surfaces. In a case with a relatively lower free-stream Mach number,
the shock/shock interaction structure maintains a seven-shock configuration during the entire oscillation process. On the
other hand, the oscillation is accompanied by a transition between a six-shock configuration (regular interaction) and a seven-shock
configuration (Mach interaction) in a case with a higher free-stream Mach number. Numerical results also indicate that the
critical wedge angle for the transition from a steady to an oscillation solution is higher compared to the corresponding value
in earlier numerical research in which the perfect diatomic gas model was used.
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Keywords: | Shock/shock interaction Oscillation Hypersonic Double-wedge Numerical study |
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