冲压发动机突扩燃烧室燃烧效率的计算方法

CALCULATION OF COMBUSTION EFFICIENCY OF DUMP COMBUSTOR IN RAMJET ENGINE

关键词:  燃烧性能  冲压式喷气发动机  性能分析  燃烧试验

Key words:  Combustion performance. Ramjet engine  Performance analysis  Combustion test

摘要:

通过对大量的试验结果分析,对Lefebvre A H和Gordon A H等人提出的燃烧效率参数θ进行了改进。提出了一个综合参数Ω。并找到了冲压发动机燃烧室燃烧效率η_c与Ω之间的定量关系式。利用这个关系式可以对燃烧效率进行计算。计算与试验结果误差约为5％～10％。计算方法也适用于一般的冲压发动机燃烧室燃烧效率计算。其精度为5％～10％。

Abstract:

In this paper, calculation of combustion efficiency of dump combustors in ramjet engine is discussed.The parameters discussed include inflow angle, the location of fuel manifold, equivelence ratio, the combustor pressure etc. The original combustion efficiency parameter considered by Lefebvre A H and Gordon A H is modified. A new combustion efficiency parameter Ωis presented.And a quantitative relation between combustion efficiency ηc and combustion efficiency parameterΩ is formulated.The combustion efficiency was calculated by using the new formula.The deviation of calculated d-ata from experimental data is within the range of 5%-10%.The calculated method can also be used to the conventional ramjet engine.