Abstract: Due to extremely short residence time of supersonic airflow, it is difficult to effectively mix and combust for the fuel and air in scramjet combustor. The cavities integrated fuel injector, mixer and flame holder were gained attention as a promising method, which can enhance mixing and combustion of the fuel and air in the scramjet combustor. The field characteristics of cavity were introduced in those aspects, such as self-oscillation and its controlling techniques, residence time, drag and so on. The recent research of cavity as flame holder in the scramjet combustor was reviewed in both experimental and numerical aspects. Some problems of cavity as flame holder were needed to further investigate in order to improve the performance of scramjet.

Key words: Supersonic combustion;Scramjet;Combustion chamber;Jet mixing;Flame holder

摘要： 高超声速气流在燃烧室的停留时间非常短,使得超燃冲压发动机燃烧室内燃料与气流的混合及其燃烧变得非常困难。目前集燃料喷射、混合及火焰稳定为一体的凹槽有望改进这一情况而受到了普遍关注。介绍了超声速气流流过凹槽的自激振荡及其控制、停留时间和阻力等特性,总结、分析了近几年凹槽在超声速气流中增强混合及燃烧的实验与数值研究,指出了在把凹槽用于提高超燃冲压发动机性能方面存在的问题和进一步研究的方向。

关键词: 超音速冲压喷气发动机;燃烧室;喷射混合流;超音速燃烧;火焰稳定器