双进气道结构下带凹腔补燃室燃烧特性数值研究  

Numerical study of combustion characteristics of secondary combustion chamber with cavity under dual intake structure

作　　者：王彦红 姚弘悦 东明[2] WANG Yanhong;YAO Hongyue;DONG Ming(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China;School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《大连理工大学学报》2025年第1期38-47,共10页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51876031)。

摘　　要：针对导弹应用固体冲压发动机补燃室的掺混燃烧问题,通过一次燃气的气相燃烧模型和硼燃料的KING燃烧模型,探究了双侧90°和双侧180°进气条件下带凹腔补燃室(后倾角范围为90°~150°)的温度场和流场分布情况.阐述了凹腔旋流效应及其对燃烧过程和燃烧产物的影响,进行了燃烧性能量化分析.数值结果表明:双侧180°进气条件下凹腔增大了燃料和空气的掺混空间,凹腔截面出现4个大对冲旋涡,掺混更加均匀,有利于燃烧组织,有效燃烧空间更大,补燃室出口总燃烧效率达到85%.双侧90°进气条件下凹腔截面形成逆时针单向旋涡,燃烧集中在狭小空间,对燃烧过程不利,补燃室出口总燃烧效率仅为55%.凹腔后倾角由90°提高到120°时,燃料和空气的掺混空间增大,促进了燃烧过程.凹腔后倾角继续提高到150°,凹腔空间增大改善燃烧的作用微弱.In response to the problem of mixed combustion in the solid ramjet secondary combustion chamber of missile application,the temperature field and flow field distributions of the secondary combustion chambers with cavity(with a caster angle range of 90°-150°)under dual 90°and dual 180°intake conditions are investigated using a gas-phase combustion model of primary gas and a KING combustion model of boron fuel.The cavity swirl effect and its impact on combustion process and combustion products are elaborated.Quantitative analysis of combustion performance is conducted.The numerical results show that the cavity increases the mixing space of fuel and air under the dual 180°intake condition,and four large opposing vortices appear on the cavity cross-section,making the mixing more uniform and conducive to the combustion organization,the effective combustion space is larger,and the total combustion efficiency at the outlet of the secondary combustion chamber reaches 85%.Under the dual 90°intake condition,a counterclockwise unidirectional vortex is formed on the cavity cross-section,and the combustion is concentrated in a narrow space,which is unfavorable for the combustion process,and the total combustion efficiency at the outlet of the secondary combustion chamber is only 55%.When the caster angle of cavity increases from 90°to 120°,the fuel-air mixing space is increased,which promotes the combustion process.As the caster angle of cavity continuously increases to 150°,the effect of increasing the cavity space on improving combustion is weak.

关 键 词：双进气道结构 凹腔 补燃室 硼颗粒 燃烧过程 

分 类 号：V438[航空宇航科学与技术—航空宇航推进理论与工程]