非稳态超声速燃烧研究进展

Overview on the research progress of unsteady supersonic combustion

超燃冲压发动机内部的超声速燃烧过程已经得到了持续和广泛的研究。随着研究的不断深入,超声速燃烧基础研究的关注热点,也逐渐从以火焰稳定过程为代表的准稳态过程,转到了以燃烧振荡过程为代表的非稳态过程。目前,非稳态超声速燃烧及其调控已经成为超燃冲压发动机迈向真正实用化所必需解决的问题。本文以非稳态超声速燃烧作为研究对象,分别针对超燃冲压发动机燃烧室中的声学振荡、流动诱导的燃烧不稳定、点火过程、火焰闪回以及近吹熄极限的火焰不稳定这五个典型非稳态超声速燃烧过程进行了系统的综述,梳理了近年来关于非稳态超声速燃烧过程的研究进展,分析了非稳态超声速燃烧过程机理并给出了一些模型及调控方法。最后,为下一步开展非稳态超声速燃烧研究提出了建议。

Supersonic combustion process in a scramjet engine has been investigated widely for decades.With digging deeper into the supersonic combustion issues,the hot spot of supersonic combustion studies has been shifted gradually from quasi-steady state such as flame stabilizations to unsteady state such as combustion fluctuations.Nowadays,unsteady supersonic combustion and its control strategy become a challenge for real scramjet engine applications.This paper investigates unsteady supersonic combustion processes and gives a comprehensive review on five typical unsteady supersonic combustion phenomena,which include acoustic oscillation in scramjet engines,combustion instability induced by flow unsteadiness,ignition,flame flashback,and flame behaviors near blowoff limits.The recent research progress on these issues has been overviewed.Fundamental mechanisms of the typical unsteady supersonic combustion are discussed,and some established models and control strategies are given.Finally,suggestions for further conducting unsteady supersonic combustion investigations are proposed.