| Citation: | YANG Rui, ZHANG Qibin, CHEN Qingyun, et al. Experiment on detonation wave failure mechanism at near equivalence ratio limits[J]. Journal of Aerospace Power, 2025, 40（12）：20240063 doi: 10.13224/j.cnki.jasp.20240063
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To investigate detonation wave failure near the equivalence ratio limit, experiments were conducted with ethylene as fuel and 50% oxygen-enriched air as the oxidizer. The detonation limit was approached by adjusting the equivalence ratio (0.6—1.4) at different initial pressures (32 kPa, 30 kPa, and 28 kPa). High-speed shadowgraphy captured the detonation waves’ cellular structures. Results showed that lower initial pressures and equivalence ratios deviating from 1 decreased the mixture reactivity, leading to a larger chemical induction zone. Near detonation limits, the failure mechanism was linked to transverse wave attenuation, causing a thicker induction layer and decoupling the leading shock wave from the reaction zone. This resulted in reduced wave speed, below 70% of the Chapman-Jouguet (CJ) value. A notable correlation between induction layer thickness and velocity deficit was found: thicker induction layers hindered the combustion energy’s support for shock wave motion, causing a larger velocity deficit.
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