Numerical simulations of forward detonation drivers for high-enthalpy shock tunnel
In this paper, detonation propagation in a forward detonation driver is simulated by solving axis-symmetric Euler equations to examine its performances. The Dispersion Controlled Dissipation (DCD) scheme is adopted in the simulations and the two-step chemical reaction model modified by M. Sichel et al. are accepted for a H2 − O2 mixture. The flowfield near the cavity ring is treated as a two-dimensional case and other sections are one-dimensional. The propagation, reflection and focusing of the detonation are captured in detail and numerical results show the ratio of the cavity radius to that of the detonation tube plays an important role in wave interaction. It is observable that a strong up-stream travelling shock wave is generated from detonation wave reflections and shock wave focusing, which can elevate the flow pressure that has decreased because of Taylor expansions waves. In the driven section, the contact interface almost staying near the end of the driven section after the shock wave reflection affects long-drawn usable test gas flow more or less.
KeywordsShock Wave Detonation Wave Shock Tube Cavity Ring Shock Wave Propagation
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