乙烯超声速燃烧室悬臂斜坡喷注器射流数值分析  

Numerical Analysis on Supersonic Combustion Using Ethylene with Cantilevered Ramp Injector

作　　者：张涵[1] 吴达[1] 王旭东[1] 

机构地区：[1]空军工程大学防空反导学院,西安710051

出　　处：《航空工程进展》2016年第3期286-293,308,共9页Advances in Aeronautical Science and Engineering

摘　　要：超声速燃烧室中燃料的掺混强化问题越来越受到各国的重视,为了研究超声速燃烧室中悬臂斜坡低动压喷射的流动特性,通过数值模拟方法研究悬臂斜坡喷注器对乙烯射流的作用规律,对比分析有无悬臂、有无后掠以及不同悬臂构型对流场的影响。结果表明:相对于传统斜坡结构,悬臂斜坡结构可使流场远场掺混效果得到明显改善,穿透深度增加;后掠结构能有效增强流场流向涡,从而达到掺混增强的效果,但同时带来更大的总压损失;三角悬臂斜坡结构相比于后掠悬臂斜坡结构对流向涡增强效果不明显,掺混效果弱于后掠悬臂斜坡结构,但总压损失较小;两种后掠悬臂斜坡结构的流场特性差异不明显。The mixing enhancement problem of fuel in combustor of scramjet becomes more and more attractive. To analyze flow characteristics of the cantilevered ramp injector in supersonic combustion, the numerical simula- tion is carried out to investigate the effects of cantilevered ramp injector on ethylene injection. Several conditions are carried to analyze the influence of the flow field, such as.. with and without cantilevered, swept and non swept structures, and different kinds of cantilevered structure. It is found that the cantilevered ramp structure can enhance the mixing effects and increase penetration depth, comparing with traditional ramp injectors. Swept structure can effectively enhance the stream-wise vortieity in the flow field, so as to enhance the mixing effects, but bring higher total pressure loss. Triangular cantilevered structure cannot enhance the stream-wise vorticity, and so as not to enhance the mixing effects, but bring lower total pressure loss. There is no obvious difference in flow fields between two kinds of swept cantilevered ramp structures.

关 键 词：超声速燃烧室 悬臂斜坡 掺混增强 乙烯 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]