摘要
为能直观了解由爆燃到爆震的转捩过程(简称DDT)中激波的变化过程,在60 mm×60 mm×2 000mm方爆震管的侧面设置了60 mm×1 380 mm的窗口来获得爆震波的烟迹图,分别用乙炔(C2H2)和空气、氢气(H2)和空气混合物进行了单次爆震性能研究.利用安装在同一截面上的压力传感器与离子探针同时测得DDT位置段爆震管内的压力分布、火焰传播速度和方向.试验结果表明:①烟迹法是研究DDT更为直接和有效的手段之一;②在本试验条件下,观察到DDT过程中过爆只会出现一次,但从过爆衰减至正常C-J爆震波的过程中存在多次多点爆炸的迹象;③初始条件相同的情况下,乙炔的胞格尺寸小于氢气的胞格尺寸.
In order to understand the process of shock movement, soot records were obtained by arranging a window of 60mm× 1380mm laterally onto a square donation tube. A series of single detonation experiments were conducted to study the performance of C2 H2/air and H2/air mixtures in square detonation tube. The pressure transducers and ion probes were utilized to measure the pressure and velocity in the tube, respectively. The results indicate that ： ① Soot records is one of direct and effective means; ② Overdriven detonation appears only once and several blasts appear in DDT（Deflagration to detonation transition）; ③ The dimension of acetylene is less than that of hydrogen under the same initial condition.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2008年第11期2049-2054,共6页
Journal of Aerospace Power
基金
国家自然科学基金(50506012)
关键词
燃烧
爆震
烟迹法
DDT
combustion
detonation
soot records
DDT
