设置空腔的超声速燃烧室流场数值模拟

Numerical simulation on flowfield in supersonic combustor with cavity

关键词:  超音速冲压喷气发动机  冲压进气燃烧室  超音速燃烧  空腔流  流动分布  数值仿真

Key words:  Supersonic combustion ramjet engine  Ram air combustor  Supersonic combustion  Cavity flow  Flow distribution  Numerical simulation

摘要:

用数值解二维 N- S动量守恒、能量及组分守恒方程 ,模拟了一个设置空腔的超燃燃烧室流场参数分布及性能。计算结果表明 ,空腔扩大了超燃燃烧室的火焰稳定工作范围 ,并提高了燃烧效率。在计算的燃烧室进口状态下 ,空腔内的平均温度、压力取决于空腔内的平均混气比 ,当混气比接近于恰当比时 ,空腔对燃烧室性能影响最大

Abstract:

The parameter distribution and performance of supersonic combustor with cavity were calculated by means of the solution of 2 D N S momentum, energy and mass fraction conservation equations. The results of calculation show that the flameholding range of supersonic combustor can be enlarged using cavity and the combustion efficiency is improved. Under the conditions of combustor entrance the average temperature and pressure in cavity depend on the average fuel air ratio in it. When the ratio equals approximately to the equivalent fuel air ratio, the cavity has a violent influence on the property of combustor.