受凹腔燃烧室构型尺寸的限制和高速气流的影响，超燃冲压发动机燃烧室内燃料的掺混效率低下。针对这一问题，基于脉冲电弧等离子体激励器矩阵，设计了同步激励模式和两种行波激励模式，应用高速纹影测试开展了等离子体激励调控超声速凹腔流场的试验。综合流场演化和纹影图像的统计分析，对比了不同激励器同步工作列数、激励模式对3种不同后壁倾角凹腔流场的调控效果。等离子激励可以有效激发凹腔剪切层的密度脉动。在基准（无激励）状态下，由于凹腔谐振强度的增加，后壁倾角越大，剪切层的脉动强度越大；而且后壁倾角越大，等离子体激励诱导的密度脉动增量越小。在同步激励模式下，随着激励器列数的增加，对流场的扰动范围扩大，这使剪切层的密度脉动强度增加。从增强剪切层密度脉动强度来看，两种行波激励模式的控制效果均优于同步激励。上游行波激励模式在1个激励周期内均匀分布扰动，旨在提高等效激励频率；而下游行波激励模式沿流向将激励诱导的热气团叠加，增加了与剪切层的相互作用程度，使其脉动幅度显著增加。从物理机制上看，等离子体激励诱导的冲击波和热气团是扰动的根源，这些扰动使边界层增厚并激发了剪切层的不稳定性，从而导致波浪形摆动的产生。

Restricted by the cavity combustor configuration size and influenced by the high-speed airflow， fuel mixing efficiency within a scramjet combustor is low. To address this issue， based on a pulsed arc plasma actuator matrix， a synchronous actuation mode and two traveling wave actuation modes were designed. High-speed schlieren imaging was employed to conduct tests on plasma actuation for controlling the supersonic cavity flow field. The control effectiveness of the number of synchronously actuated actuator columns and the different actuation modes on cavity flow fields with three different aft-wall inclination angles were comparatively analyzed by synthesizing flow field evolution and statistical analysis of schlieren images. Plasma actuation can effectively excite density fluctuations in the cavity shear layer. Under baseline （no actuation） conditions， as the aft-wall inclination angle increases， the fluctuation intensity of the shear layer exhibits a monotonically increasing trend due to enhanced cavity resonance； moreover， the larger the aft-wall inclination angle， the smaller the increment in density fluctuations induced by plasma actuation. In the synchronous actuation mode， as the number of actuated columns increases， the disturbance range to the flow field expands， leading to a monotonic increase in the amplitude of shear layer density fluctuations. Both traveling wave actuation modes outperform the synchronous mode. The upstream traveling wave mode distributes disturbances evenly over one actuation cycle， aiming to increase the equivalent actuation frequency. Conversely， the downstream traveling wave mode superimposes the thermal bulbs induced by plasma actuation along the streamwise direction， enhancing the degree of interaction with the shear layer and causing a significant increase in its fluctuation amplitude. Physically， the shock waves and thermal bulbs induced by plasma actuation are the root causes of the disturbances. These disturbances thicken the boundary layer and excite instabilities in the shear layer， thereby leading to the generation of wavy oscillations.