| Citation: | CHEN Nan, Sudip BHATTRAI, TANG Haoet al. Numerical simulation of influence of temperature disturbance on oblique detonation wave structure[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(7): 1537-1546. doi: 10.13700/j.bh.1001-5965.2017.0561(in Chinese)
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2D Euler equations were used for the numerical simulation of the influence of temperature disturbance on oblique detonation waves (ODW) in an oblique detonation combustion chamber. Instantaneous variation of temperature was introduced from the inlet as the disturbance by increasing and decreasing 100 K respectively. The simulation results show that the ODW can adjust with the temperature disturbance and the transition progress is smooth enough. But the inherent instability of ODW is found to be further released by disturbance and cell structure is clearer. The existing form of disturbance was researched quantitatively and qualitatively, which is the complex of shock wave, expansion wave and weak compression wave. Comparison between the results from two kinds of disturbance was conducted, which demonstrates that the distribution of waves is basically the same in detonation zone, while reversed in deflagration zone. It is caused by the difference in the strength of weak compression wave in two cases, which effects the ODW structure enormously in consequence. Furthermore, at decreasing temperature, the complex of three kinds of wave propagates downstream along the ramp and shock wave appears in four types of form which are bow-like shock, Mach reflection, regular reflection and normal shock nearly vertical to the ramp. There is an enormous bifurcation at increasing temperature, where the waves propagate along the surface of ODW and the form of waves remains stable relatively.
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