气氢/气氧同轴剪切单喷嘴燃烧室壁面热流计算与分析

以气氢/气氧为推进剂,采用数值模拟方法,研究了同轴剪切喷嘴设计参数——氢氧速度比和氧压降比对单喷嘴燃烧室内燃烧过程和壁面热载的影响,并将绝热壁面条件、等温壁面条件的计算结果与试验结果进行了对比分析,结果表明:氢氧速度比增大,燃烧性能提高,壁面热载增加;氧压降比增大,燃烧性能下降,壁面热载减小;相比采用壁面绝热燃气温度,采用热流预示燃烧室壁面热载与真实情况更为接近.

Simulation and analysis of wall heat fluxes for shear coaxial GH2/GO2 single element combustor

With gas hydrogen/gas oxygen being propellant,adopting numerical simulation,design parameters of shear coaxial injector,namely ratio of fuel velocity to oxidizer velocity and the ratio of oxidizer pressure drop to combustor pressure have been studied to find their impact on combustion characteristics and thermal loading of chamber wall.The simulation results of two kinds of wall boundary condition which were adiabat condition and isothermal condition were compared with experimental result.It shows that the increasing of the ratio of fuel velocity to oxidizer velocity improves the combustion performance and wall heat flux.The increasing of the ratio of oxidizer pressure drop to combustor pressure decreases the combustion performance and wall heat flux.In comparison with wall gas temperature,wall heat flux is more consistent with the real condition when used to predict thermal loading of combustion chamber wall.