热射流点火对多循环爆震管内火焰传播特性的影响  

Effects of Hot Jet Ignition on Flame Propagation Characteristics in Multi-Cycle Detonation Tube

作　　者：赵炜[1] 韩启祥[1] 王家骅[1] 贾冰岳 宫继双[2] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]中国航天科工集团三十一研究所,北京100074

出　　处：《推进技术》2015年第12期1846-1851,共6页Journal of Propulsion Technology

基　　金：江苏省普通高校研究生科研创新计划资助项目(CXLX11_0215)

摘　　要：为研究热射流点火对多循环脉冲爆震特性的影响,在一台工作频率为20Hz的气动阀式PDE上开展了试验研究,重点分析了热射流点火位置与预燃室中敏感性气体的填充比对爆震管内初始火焰传播速度及压力特性的影响。研究结果表明：热射流点火的位置在爆震管头部回流区内,对爆震管内火焰传播速度影响较小,热射流点火位置在回流区外,随着离封闭距离的增加火焰传播速度减小;预燃室填充比从1.78增加到2.75,初始火焰平均速度从380m/s上升到420m/s左右,当填充比在2.75~3.45时,火焰传播速度基本保持不变。In order to study the characteristics of multi-cycle pulse detonation with hot jet ignition,series of experiments were performed with an aero-valve pulse detonation engine at the operation frequency of 20 Hz.The initial flame propagation velocity and pressure characteristics were analyzed with different hot jet ignition positions and fill fraction of jet sub-chamber. The experimental results show that the hot jet slightly affects the initial flame propagation velocity,which is located in the recirculating zone in the head of detonation tube. However,the initial flame velocity decreases as the distance between hot jet position and blind head increases,which is located outside the recirculating zone. The initial average flame velocity increases from 380m/s to 420m/s as the fill fraction increases from 1.78 to 2.75 and changes slightly for the fill fraction between 2.75 to 3.45.

关 键 词：热射流 脉冲爆震发动机 点火位置 填充比 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]