Initiation characteristics of oblique detonation waves in hydrogen-air mixture

Abstract eng:
The initiation features of two-dimensional, oblique detonations from a wedge in a stoichiometric hydrogen-air mixture are investigated via numerical simulations using the reactive Euler equations with detailed chemistry. A parametric study is performed to analyze the effect of inflow pressure P0, and Mach number M0 on the initiation structure and length. Quantitatively the initiation length decreases with increasing M0, primarily due to the increase of post-shock temperature. The effect of M0 on initiation length is independent of P0, but given the same M0, the length is found to be inversely proportional to P0. Theoretical analysis based on the constant volume combustion (CVC) theory is also performed, which are close to the numerical simulations in the case of high M0 regardless of P0, demonstrating that temperature is the key parameter affecting the initiation. Decreasing M0, the CVC theory breaks down, suggesting a switch from chemical kinetics-controlled to a wave-controlled gasdynamic process.

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