亚燃冲压发动机燃烧室燃油浓度分布预测  

Numerical prediction of fuel distribution in a ramjet chamber

作　　者：黄日鑫[1] 谭永华[2] 

机构地区：[1]西安航天动力研究所,陕西西安710100 [2]航天推进技术研究院,陕西西安710100

出　　处：《火箭推进》2008年第4期17-21,共5页Journal of Rocket Propulsion

摘　　要：基于Fluent两相反应流场计算平台,采用涡耗散概念模型,对典型亚燃冲压发动机燃烧室的两相反应流场进行三维数值模拟计算。重点研究温度场影响下的燃油气相分布,计算给出气相燃油在火焰稳定装置前后以及内部的分布,得到燃油在亚燃冲压发动机燃烧室内分布的一般规律。计算发现,稳定装置内部及近后方燃油分布较富,到达火焰峰以后,燃油浓度急剧下降。计算预测径向蒸发管后壁面与最外环蒸发管内的燃油富集,而中间环蒸发管燃油分布较贫,计算结果与燃烧试验结果一致。A simple numerical analysis was conducted to explore the fuel vapor distribution in a ramjet combustion chamber, especially in the near-field and inside of flame holder. With the help of Fluent software two-phase reacting flow module, the 3D numerical simulation was performed by using eddy dissipation concept model. A general law of fuel distribution in hot flow of the chamber was obtained in the simulation. The simulation results indicate that there is a rich-fuel area inside the holder and near its downstream part. Then, the fuel concentration fails down rapidly over the combustion area. The results also indicate that both back inner walls of the radial evaporating pipe and inside the outer circumferential evaporating pipe are fuel concentrations, but the fuel concentration inside the mid-circumferential-pipe is lean, which is accord with the experiment results very well.

关 键 词：亚燃冲压发动机 燃烧室 燃油浓度 涡耗散概念模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]