摘要
低压不利于燃烧,从化学动力学角度分析,压力降低导致空气密度降低,化学反应速率降低。用冲压发动机模型燃烧室进行了低压燃烧试验,结果显示:进口压力pin从0.094 MPa变至0.065 MPa,燃烧效率由大变小;压力降低到0.065 MPa时,燃烧室燃烧性能急剧恶化,燃烧极不稳定,随时可能因压力波动或油气参数变化而熄火。无传焰槽时燃烧效率随压力的变化规律与有传焰槽的一致,但燃烧效率相对低一些。
Low pressure is an adverse condition for combustion.On the basis of chemical dynamics,decreasing pressure leads to decreasing density of air and decreasing rate of chemical reaction.Experiments in a ram jet prototype combustor were carried out.The results demonstrated that while the inlet pressure of the combustor pin varied from 0.094 to 0.065MPa,the combustion efficiency decreased;when the pressure pin decreased to 0.065MPa,the combustor performance deteriorated rapidly,and the combustion became so unsteady that the fire could quench anytime with the fluctuations of pressure or fuel/ air parameters.The qualitative characteristics of combustion efficiency with pressure were the same whether there was a flame-passing gutter or not,however,the combustion efficiency was lower when there was not.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2011年第4期509-511,524,共4页
Journal of Propulsion Technology
关键词
冲压喷气发动机
燃烧室
低压
Combustion chamber
Ramjet engine
Low pressure
