气相DDT中过爆轰现象产生条件的实验研究

针对目前国际上关于气相过爆轰产生条件的3种不同观点,利用压力传感器,实验研究了氢氧混合物的爆燃转爆轰(DDT)全过程。获得了比较完整的、能反映气相DDT从爆燃成长为过爆轰再衰减为稳定爆轰的全过程压力变化曲线。分析实验结果表明,氢氧混合物的DDT过程中,过爆轰的产生需要一定条件;在初始压力一定的情况下,氢氧混合物DDT过程的转变时间或距离随氢气浓度的增加,先减小后增大,过爆轰的压力峰值约为稳定爆轰压力的1.5～2倍。

Experimental Study on the Generating Condition of Over-Detonation during the Gaseous DDT

To verify the three current international views on the generating condition of over-detonation during gaseous deflagration-to-detonation transition (DDT), the DDT process of gaseous hydrogen-oxygen mixture was experimentally studied by using pressure sensors. The whole pressure histories of gaseous DDT from detonation to DDT and then to stable detonation were obtained. The experimental results showed that the generation of DDT requires certain physico-chemical conditions, and for certain initial pressure conditions, the transformation time (or distance) decreases firstly and then increases with increasing concentration of hydrogen. The peak pressure in over-detonation is about 1.5~2 times as much as that in the stable detonation.