狭缝内爆轰波传播模式的实验研究

发布时间：2018-06-24 00:26

  本文选题：狭缝管 + 传播模式　； 参考：《推进技术》2016年07期

【摘要】：为研究狭缝内爆轰波起爆及各种传播模式的特点,实验得到了不同初始压力下(p0=10~60k Pa)化学当量比的乙烯/氧气预混气体在高度1.0mm,宽度20mm狭缝内的爆轰性能。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,实验依次得到稳定爆轰模式、"结巴"爆轰模式、驰振爆轰模式和低速稳定传播模式,中间两者为不稳定模式。不稳定爆轰传播模式具有强烈的速度震荡,在一个周期内,烟膜板中周期性的出现过驱爆轰的胞格结构,随后"结巴"爆轰以单头形式与侧壁面发生碰撞并向前传播,驰振爆轰短暂熄灭。低速稳定传播速度为45%的C-J速度,烟膜板中无胞格结构出现。狭缝内爆轰波速度亏损值为10%~15%,高于大尺寸通道中的速度亏损。
[Abstract]:In order to study the characteristics of detonation initiation and propagation modes in slit, the detonation properties of ethylene / oxygen premixed gas with chemical equivalent ratio (P0 ~ (10 ~ (10) ~ (60) KPA) at a height of 1.0 mm and a width of 20mm slit at different initial pressures have been obtained. Smoke film was used to record the trajectory of detonation wave and high-speed photography was used to capture the flame surface. The results show that the stable detonation mode, the "stuttering" detonation mode, the flashover detonation mode and the low-velocity stable propagation mode are obtained in order with the decrease of the initial pressure, and the two modes are unstable. The unstable detonation propagation mode has a strong velocity oscillation. In a period, the lattice structure of detonation is periodically observed in the smoke film plate, and then the "stuttering" detonation collides with the sidewall surface in the form of a single head and propagates forward. The galloping detonation went out briefly. C-J velocity of 45% at low speed and stable propagation velocity, no cell lattice structure appeared in the smoke film plate. The velocity deficiency of detonation wave in the slit is 10 / 15, which is higher than that in the large channel.
【作者单位】： 江苏大学能源与动力工程学院;
【基金】：国家自然科学基金(51306073,11402102) 江苏省自然科学基金(BK20130510,BK20140524)
【分类号】：O381
，

本文编号：2059129