文章摘要
双进气道结构下带凹腔补燃室燃烧特性数值研究
Numerical study on combustion characteristics of secondary combustion chamber with a cavity under the dual inlet structure
投稿时间:2023-11-16  修订日期:2023-12-27
DOI:
中文关键词: 双进气结构  凹腔  补燃室  硼颗粒  掺混燃烧
英文关键词: Dual intake structure  Cavity  Secondary combustion chamber  Boron particles  Blended combustion
基金项目:国家自然科学( 51876031)。
作者单位
王彦红* 东北电力大学能源与动力工程学院 
姚弘悦 东北电力大学能源与动力工程学院 
东 明 大连理工大学能源与动力学院 
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中文摘要:
      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°进气结构下带凹腔补燃室(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°进气时凹腔增强了燃料和空气的掺混空间,凹腔截面出现四个大对冲漩涡,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°进气时凹腔截面形成逆时针单向漩涡,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°增加到120°时,增大了燃料和空气的搅混空间,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。
英文摘要:
      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 cavity secondary combustion chambers (with a tilt angle range of 90°-150°) under dual 90° and dual 180° intake conditions were 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 the combustion process and combustion products were elaborated. Quantitative analysis of combustion performance was conducted. The numerical results show that the cavity enhances 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 secondary combustion chamber reaches 85%. Under the dual 90° intake condition, a counterclockwise unidirectional vortex is formed in the cavity cross-section, and the combustion is concentrated in a narrow space, which is unfavorable for the combustion process. The total combustion efficiency at the outlet of secondary combustion chamber is only 55%. When the inclination angle of cavity increases from 90° to 120°, it increases the fuel-air mixing space, promoting the combustion process. As the inclination angle of cavity increases to 150°, and the effect of increasing the cavity space on improving combustion is weak.
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