摘要
对高温乙烯富燃燃气与富氧空气进行旋转爆轰自起爆过程进行了实验研究。实验抛弃了传统的预爆轰管起爆方式,高温乙烯富燃燃气经过喷注与外壁面碰撞产生局部“热点”,点燃混合气体形成爆燃状态。在壁面摩擦作用以及燃烧室头部激波反射的综合作用下,爆燃火焰最终会通过爆燃转爆轰过程转变为爆燃/爆轰混合模态,生成稳定传播的旋转爆轰波。当量比会对自起爆成功率造成影响。富氧空气含氧量在40%时,当量比0.52~1.84内发动机均可成功起爆。随着富氧空气含氧量的提升,旋转爆轰波模态分别经历双波对撞、单波以及爆燃/爆轰混合模态。富氧空气含氧量变大会使得爆轰波传播速度增大,富氧空气含氧量为47.4%时获得最大爆轰波传播速度1 790.6 m/s。
The self-initiation process of high-temperature ethylene-rich gas and oxygen rich air produced by rich combustion of ethylene was studied experimentally.The experiment abandons the traditional pre-detonation tube initiation mode,and the high-temperature ethylene-rich combustion gas collides with the outer wall through injection to generate local‘hot spot’,igniting the mixed gas to form deflagration state.Under the combined action of wall friction and shock wave reflection from the head of the combustion chamber,deflagration flame will eventually change into the deflagration/detonation hybrid mode through the deflagration-to-detonation transition(DDT)process,and finally generate stable propagating rotating detonation wave.The equivalence ratio will affect the success ratio of self-initiation.When the oxygen content of air is 40%,the equivalence ratio of initiation ranges from 0.52 to 1.84.With the increase of oxygen content in the air,the rotating detonation wave modes undergo double-waves collision,single-wave and coexistence of detonation with deflagration,respectively.When the air oxygen content increases,the detonation wave propagation velocity increases,and the maximum detonation wave propagation velocity is 1790.6 m/s when the air oxygen content is 47.4%.
作者
邱晗
白桥栋
韩家祥
黄炳耀
刘嘱勇
翁春生
QIU Han;BAI Qiaodong;HAN Jiaxiang;HUANG Bingyao;LIU Zhuyong;WENG Chunsheng(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2024年第9期124-134,共11页
Journal of Propulsion Technology
基金
国防预研基金(HTKJ2020KL011004-2)。
关键词
组合发动机
旋转爆轰
自起爆
乙烯富燃燃气
富氧空气
Combined engine
Rotating detonation
Self-initiation
Ethylene-rich gas
Rich-oxygen air
