摘要
为研究圆环内爆轰波传播模式的特点,实验在螺旋型的管道内得到了不同初始压力下(p0=4~15 kPa)等当量比的乙烯/氧气预混气体的爆轰性能。采用烟膜片记录爆轰波运行轨迹,高速摄影捕捉火焰面。结果表明:随着初始压力的降低,实验依次得到稳定传播模式、临界传播模式、不稳定传播模式。临界传播模式具有强烈的速度震荡,烟膜板中内壁面附近周期性的出现过驱爆轰的胞格结构。当初始压力接近极限时,圆环内出现驰振爆轰波,驰振爆轰的再生过程是由于压缩效应不断累积而引起的局部爆炸。
To reveal the characteristics of the propagation modes,the detonation propagation in the helical detonation channel has been experimentally investigated using a stoichiometric ethylene-oxygen mixture under different initial pressures（P〈0=4~15 kPa）.Flame propagation through the helical channel was observed by high-speed CCD camera,and the trajectories of triple points on the detonation waves were obtained using a soot-deposition plate.The results show that three detonation propagation modes,namely,a stable mode,critical mode,and unstable mode with the initial pressure decreasing.For the critical mode,the circumferential velocities exhibit large degree of oscillation,and the cellular structures of the overdriven detonation occurred periodically near the inner wall.As the initial pressure decreased near the detonation propagation limit,galloping detonation appeared in annular channel and the regeneration process of the detonation was due to local explosion caused by continuous accumulation of the compression effect.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第2期435-439,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51306073
No.11402102)
江苏省自然科学基金(No.BK20130510
No.BK20140524)
江苏大学高级专业人才科研启动基金(No.12JDG081)
关键词
螺旋通道
曲率半径
传播模式
周期振荡
helical channel
radius of curvature
propagation modes
periodic oscillation
