为降低加力燃烧室的流阻损失,避免发动机推力降低与耗油率上升,采用经试验数据验证的数值计算方法,主要研究了凹腔与支板两类火焰稳定装置结构参数变化对流场结构和流阻损失的影响规律,分析了火焰稳定器结构参数与回流量以及总压恢复系数之间的关系。加力燃烧室进口马赫数为0.385,研究的凹腔火焰稳定装置倾斜角度范围为40-90 °,深度37-77 mm,支板火焰稳定器宽度范围为29-41 mm,尾缘扩张角度为0-15 °。研究结果表明：凹腔倾斜角度对流场形态的影响较小,起主要影响的结构参数是凹腔深度,总压恢复系数随深度减小而逐渐增加；支板宽度减小会导致加力燃烧室内的回流区结构减小,总压恢复系数单调增加；相较于中心锥回流区,支板尾缘和凹腔后回流区涡流强度更强,对流阻损失的影响更大；随着支板火焰稳定器尾缘扩张角度增加,支板尾缘回流区结构变大,而凹腔-中心锥回流区受到压缩逐渐减小,总压恢复系数在扩张角度约为3.5°时性能最优。

To reduce wastage of engine thrust and fuel caused by the afterburner flow resistance loss, the structural parameters of cavity and strut flame holder was studied by a numerical calculation method which had been verified by experimental data on the influence to flow field structure and flow resistance loss. The relationship among the structural parameters of the flame holder, the reflux and total pressure recovery coefficient was analyzed. The Mach number at the inlet of the afterburner is 0.385. The inclined angle range of the cavity flame holder is 40-90 ° with a depth of 37-77 mm. The width range of the strut is 29-41 mm with a trailing edge expansion angle of 0-15 °. The results show the cavity depth influences the flow field more significantly rather than cavity inclined angle. And the total pressure recovery coefficient increases when the cavity depth decreases. With the decreasing strut width, the recirculation zone in the afterburner shrinks while the total pressure recovery coefficient increases monotonously. Compared to the central cone, the recirculation zone behind the strut and the cavity has greater impact on the flow resistance loss with stronger vortex intensity. The recirculation zone behind strut grows and the integrated recirculation zone at cavity and central cone shrinks with the incremental strut trailing edge angle which leads to the optimal total pressure recovery coefficient at about 3.5 °.

V231.2

国家科技重大专项 (J2019-III-0004-0047)