摘要
利用自行设计的长29.6m、内径199mm配有40套喷粉扬尘装置的大型水平爆轰管,研究了细片状铝粉-空气混合物在40 J弱点火条件下火焰从发生到加速、最后实现爆轰转捩的全过程,探讨了铝粉浓度和点火延迟时间对爆轰参数的影响。结果表明,铝粉-空气混合物燃烧转爆轰(DDT)过程可分为慢速反应压缩阶段和快速反应冲击阶段。当点火延迟时间为370m s,铝粉质量浓度为300 g/m3时,在管道中距离点火位置83倍长径比处峰值超压为9.8M Pa,爆速为1 670m/s,发生了DDT过程。在铝粉-空气混合物自持爆轰波的传播过程中,由于呈现螺旋爆轰波结构,爆速和峰值超压随着传播距离振荡。
Ignition, flame acceleration and deflagration to detonation transition in fine flake aluminum dust-air mixture under weak ignition of 40J was studied in a horizontal tube with an inner diameter of 199 mm and length of 29.6m and equiped with 40 sets of special dust dispersion system. The influences of aluminum dust concentration and ignition delay time on the deflagration to detonation transition（DDT） process of aluminum dust-air mixture were discussed. The experimental results show that the whole DDT process of aluminum dust-air mixture can be divided into slow reaction compression stage and fast reaction shock stage. With the ignition delay time of 370ms and aluminum dust concentration of 300g · m^-3, the dimensionless transition distance from ignition point to the detonation wave formed in aluminum dust-air mixture is 83 times L/D ratio, and detonation occurs with a peak overpressure of 9. 8MPa and velocity of 1 670m · s^-1. Self-sustained detonation wave of aluminum dust-air mixture is characterized by the existence of spin detonation structure. The front wave velocity and overpressure of self-sustained aluminum dust-air mixture oscillate with the propagation distance.
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2009年第6期58-61,共4页
Chinese Journal of Explosives & Propellants
基金
国家自然科学基金资助(10772032)
关键词
爆炸力学
铝粉爆炸
燃烧转爆轰
弱点火
爆轰管
explosion mechanics
aluminum dust explosion
deflagration to detonation transition
weak ignition
detonation tube
