激波绕射触发爆震波的试验研究
Investigation on the detonation initiation by shock diffraction
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摘要: 在单爆震试验平台上对激波绕射触发爆震波的特性进行了试验研究.针对不同的激波反射器结构尺寸,测量了爆震管内气体压力变化历程及火焰传播速度,获得了不同工况下激波绕射触发爆震波的特性.结果表明:激波反射器对爆震波的形成有促进作用,并取决于反射器中的反射锥及反射孔板的结构与尺寸;在反射锥堵塞比一定的情况下,存在最佳反射锥锥角使得爆震波的形成距离最小;而反射锥与反射孔板的间距增大,爆震波形成距离增大,一旦形成稳定的爆震波后,反射器对爆震波压力的影响不大.Abstract: This paper reports on the investigation of detonation initiation by shock diffraction on a set of the single detonation.With kinds of different reflector,the pressure histories and flame propagation velocities in the detonator tube were measured to study the characteristics of detonation initiation.The results indicate that the shock diffraction could prompt the initiation of detonation,and which were affected by the dimension of the cone and plate of reflector.With same blockage ratio of the cone,there has a optimal cone angle where the DDT(deflagration to detonation transition) distance was minimum.The DDTdistance would be lengthened when the gap between the cone and plate was increased,but the pressure of detonation wave was influenced little by the reflector.
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