摘要
在燃烧室入口来流为Ma=2.64,T_0=1 483K,P_0=1.65MPa,T=724K,P=76.3kPa条件下,采用高速摄影和连续激光高速纹影对等截面型开窗燃烧室内氢气射流自燃过程、火花塞点燃氢气过程和引导氢气火焰点燃煤油过程进行了观测,获得了燃烧室内着火过程中火焰和流场波系结构的动态演化过程;观察到了初始火焰区首先起始于燃烧室下游,并逆流传播实现发动机着火的过程;分析表明燃料能否着火、以及着火位置与燃料着火时间、燃烧室流速和火焰稳定器安装情况相关,多火焰稳定区延长了燃料驻留时间,使燃料更容易着火。
Three processes of ignition were investigated by using high speed camera and schlieren system with the inflow condition of Ma = 2.64, T0 = 1 483 K, P0 = 1.65 MPa, T = 724 K, and P = 76.3 kPa, which axe autoignition of hydrogen injection, the spark igniting hydrogen and the pilot flame igniting the kerosene in a constant area model scramjet combustor. The flame propagation and shocktrains evolution in the combusotr was gained, which revealed that the flame originated from the downstream of the combustor, then propagated to upstream untill the whole combustor was ignited. The results also showed that flow velocity of combustor and installation scheme of flame holders will extremely affect the ignition delay or occurring position of ignition. Furthermore, the fuel residence time will be increased by using more cavity flameholders, which was benificial to fuel autoignition.
出处
《力学学报》
EI
CSCD
北大核心
2009年第4期455-462,共8页
Chinese Journal of Theoretical and Applied Mechanics
