点火位置和燃料喷注的有效协同对超燃冲压发动机燃烧室内的可重复强化点火至关重要。在燃烧室入口来流马赫数为2.92，总温为1590 K的条件下，提出燃烧室侧壁面多通道滑动弧（Multi-channel gliding arc，MCGA）等离子体放电与凹腔内燃料喷注协同强化超燃冲压发动机点火的方法，采用多视角高速摄影、高速纹影、电光同步高速诊断等测量技术，研究了等离子体作用位置和喷注时序对点火和火焰传播的影响，揭示了点火位置与燃料喷注时序的匹配关系、协同作用效果和机理。试验结果表明，在燃料喷注建立阶段，作用于凹腔前缘附近的MCGA等离子体与燃料喷注有较好的协同点火效果；而当其作用于凹腔后缘时，火核容易吹熄，全局火焰建立时间较长，协同点火效果较差。在燃料喷注稳定阶段，作用于凹腔后缘附近的MCGA等离子体能够与燃料喷注形成良好的协同点火和维持稳定燃烧的效果。

Ignition location and fuel injection are jointly crucial for achieving repeatable enhanced ignition in scramjet combustors. This study proposes an enhanced joint ignition method involving multi-channel gliding arc (MCGA) plasma and fuel injection to enhance ignition in a scramjet with an inflow Mach number of 2.92 and a combustor total temperature of 1590 K. The measure-ment techniques, such as multi-view high-speed photography, high-speed schlieren, and electro-optical synchronous high-speed imaging, were employed to investigate the effect of ignition position and fuel injection timing on ignition and flame propagation, showing the matching relationship, joint effect, and mechanism between ignition location and fuel injection timing. At the estab-lishment stage of increasing the fuel mass rate, the MCGA plasma near the leading edge of the cavity has a good joint ignition effect with the fuel injection. However, when it acts on the rear edge of the cavity, the flame kernel is easy to blow out, the global flame takes a long time to build, and the joint ignition effect is poor. At the stabilization stage with a constant fuel mass rate, the MCGA plasma near the rear edge of the cavity can form an excellent joint ignition and maintain stable combustion with the fuel injection.