Reliable ignition, flame-holding, and efficient combustion are crucial, particularly for the newly designed afterburner in variable cycle engines (VCEs). Herein, the air-entraining parts are close-coupled with the cavity-strut structures to simulate the variable cycle conditions of afterburner for VCEs; further, the performances of the lean ignition, blowout, and combustion with air-entraining function are experimentally investigated. Furthermore, attempts have been made to provide reasonable explanations regarding the discrepancies aroused by altering air-entraining intensity. The results indicate that the air-entraining can compensate for the destruction of strut on flow patterns inside cavity, and widen the ignitable space for ignition and extend the flammable Ma number by slightly sacrificing the ignition performance near the leading edge of cavity. An air-entraining stream with an air-entraining rate of 3.77% can decrease the lean ignition and blowout fuel/air ratio (FAR) by 21.07% and 26.91%, respectively. Increasing the air-entraining intensity can accelerate the flamelet growth, but may conversely enforce the flame fluctuation, which is caused by flame quenching under intense turbulence. Moreover, the expansion of cavity flame towards the main-stream enhances with the increasing air-entraining intensity, resulting in an increment of over 200 K in temperature rise of cavity-strut combustor.

可靠的点火，火焰保持和有效燃烧至关重要，特别是对于可变循环发动机（VCE）中新设计的加力燃烧室。在此，引气部件与空腔-支柱结构紧密耦合，以模拟VCE加力燃烧器的可变循环条件。此外，还对带有空气夹带功能的稀薄点火，爆燃和燃烧的性能进行了实验研究。此外，已经尝试提供有关改变引气强度引起的差异的合理解释。结果表明，引气可以补偿支杆对空腔内部流型的破坏，通过略微牺牲腔体前缘附近的点火性能，扩大点火空间并扩大可燃马氏数。引气率为3.77％的引气流分别可使稀薄点火和井喷燃料/空气比（FAR）降低21.07％和26.91％。增加引气强度可以加速小火焰的生长，但可能反过来增强火焰波动，这是由于强烈湍流下的火焰猝灭引起的。而且，腔火焰向主流的膨胀随着空气夹带强度的增加而增强，导致腔-支柱燃烧器的温度上升增加了200 K以上。分别为07％和26.91％。增加引气强度可以加速小火焰的生长，但可能反过来增强火焰波动，这是由于强烈湍流下的火焰猝灭引起的。而且，腔火焰向主流的膨胀随着空气夹带强度的增加而增强，导致腔-支柱燃烧器的温度上升超过200K。分别为07％和26.91％。增加引气强度可以加速小火焰的生长，但可能反过来增强火焰波动，这是由于强烈湍流下的火焰猝灭引起的。而且，腔火焰向主流的膨胀随着空气夹带强度的增加而增强，导致腔-支柱燃烧器的温度上升增加了200 K以上。