| Citation: | ZHONG Shilin, PENG Weikang, KANG Yudong, et al. Investigation on the ignition characteristics of trapped vortex cavity hyper-burner under multi-modes[J]. Journal of Aerospace Power, 2026, 41（6）：20250603 doi: 10.13224/j.cnki.jasp.20250603
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Ignition experiments and numerical simulations were conducted on a trapped vortex cavity hyper-burner using a rectangular test rig with rotating rear variable area bypass injector, covering turbine, transition, and ramjet modes. The study involved ejector exit Mach numbers ranging from 0.21 to 0.32, with inlet temperatures of 700 K for the turbine mode and 310 K for the ramjet mode. The results indicated that following ignition, the lag in the combustor temperature rise affected fuel evaporation, leading to a stepwise increase in flame intensity. The flame in the cavity achieved stabilization between 5 and 10 ms, while the global flame in the combustor stabilized within 35 ms. Flame intensity was positively correlated with the fuel flow rate; at low fuel flow rates, the flame was stabilized solely by the cavity, whereas at high flow rates, it was stabilized by both the cavity and the radial stabilizer. Regarding the influence of the ejector angle: from 0° to 4.6°, the cavity air temperature dropped from 700 K to 310 K, requiring the equivalence ratio to increase from 0.33 to 1.21 to achieve ignition with fixed ignition energy; from 4.6° to 13.8°, the cavity inlet velocity decreased while the Sauter mean diameter (SMD) increased, necessitating a further increase in the equivalence ratio to 2.26 to maintain the quenching distance; from 13.8° to 23°, the cavity inlet velocity increased and the SMD decreased, allowing the equivalence ratio to drop to 1.43. It was concluded that the lean ignition limit was negatively correlated with the cavity inlet velocity. Consequently, the design of the regulation control law should prioritize the stabilization of the cavity inlet velocity.
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