凹槽火焰稳定器前缘结构对煤油超声速燃烧的影响  

Effect of the Fore-edge Configuration of Cavity Flame Holder on the Kerosene Combustion in Supersonic Air Stream

作　　者：蔡元虎[1] 刘欧子[1] 胡欲立[1] 刘敬华[2] 凌文辉[2] 

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]北京动力机械研究所,北京100074

出　　处：《机械科学与技术》2007年第7期817-821,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(50086002);西北工业大学博士论文创新基金项目(200219)资助

摘　　要：采用离散液滴模型、概率密度函数紊流燃烧模型和两方程紊流模型数值,模拟了双模态冲压发动机燃烧室内不同前壁面结构凹槽的超声速燃烧火焰稳定特性。在相同的计算条件下,数值分析结果表明:与具有正规凹槽结构的燃烧室相比,具有斜面凹槽结构的燃烧室:壁面静压分布更加合理;其内涡量比较强;燃烧室出口总压恢复系数和燃烧室效率都比较大。因而认为斜面凹槽火焰稳定器提高了混合和燃烧,优于正规凹槽火焰稳定器。The flame holding characteristics of the cavities with different fore-edge configurations inside dual-mode scramjet engine were numerically simulated based on the turbulence and combustion model with probability density function, the two-equation turbulence model and the discrete droplet model. Under the same calculation condition, compared with the combustor with normal cavity, the combustor with beveled cavity has more rational distribution of wall static pressure, its vorticity is stronger and the total pressure recovery coefficient at the outlet of the combustor and combustion efficiency are larger. The simulation results show that the beveled cavity flame holder can improve the mix and combustion and is better than the normal cavity flame holder.

关 键 词：双模态冲压发动机 超声速燃烧 凹槽火焰稳定器 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程] TK16[动力工程及工程热物理—热能工程]