AP/HTPB推进剂扩散火焰结构分析  

Analysis of diffusion flame structure of solid composite propellant

作　　者：叶锐[1] 余永刚[1] 曹永杰[1] 

机构地区：[1]南京理工大学能源与动力工程学院,南京210094

出　　处：《固体火箭技术》2013年第6期766-770,共5页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(51176076)

摘　　要：为研究AP/HTPB复合固体推进剂燃烧扩散火焰结构,建立了二维周期性三明治简化模型。结果表明,贝克莱数Pe和达姆科勒数Da对扩散火焰有较大影响。当给定有限Pe数时,对流输运速率与扩散速率在同一个量级,化学计量表面(SLS)与燃烧表面的交点并不在氧化剂与粘合剂的交界面处,而是偏向氧化剂侧;当考虑有限速率化学反应时,燃烧火焰仅占据SLS一部分,表明存在着部分预混的前沿火焰结构;当Da数较小时,化学反应速率较慢,氧化剂气体与粘合剂产物能较充分混合,在燃烧表面上方形成合并的前沿火焰结构,并产生较均匀的热释放分布;当Da数增大时,化学反应速率增强而扩散混合速率基本不变,火焰结构靠近燃烧表面,合并的前沿火焰结构逐渐分离,并形成狭长的扩散火焰带。A two dimensional periodic sandwich model was built to study the diffusion flame structure of a burning AP/HTPB composite propellant.The results show that Peclet number and Damkohler number have great influence on the diffusion flame.The stoichiometric level surface（SIS） intersects the propellant surface at a point deviating from the oxidizer/fuel interface and locating at the oxidizer side when a finite Peclet number is included.Under this condition, the diffusion transport rate is on the same order of the convective transport rate.The flame structure just occupies part of the SIS,implying the existence of partly pre-mixed leading edge flame structure,when the finite chemistry effect is considered.The leading edge flame structure merges together and a relatively uni- form heat release distribution is formed under well mixing of the flame and the propellant surface if the Damkohler number is small. The merged flame gradually separates and a long and narrow diffusion trailing flame forms when the reaction rate is enhanced as the Damkohler number gradually increases.

关 键 词：复合固体推进剂 Pe数 Da数 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]