为了研究乳化粉装炸药在生产、运输、贮存、使用过程中的稳定性和安全性,分析其燃烧转爆轰(DDT)机理,选用粒径分别为92、130、150μm的乳化粉状炸药样品作为研究对象,利用DDT管密闭装置,对不同装填密度的药床设计了多种实验方法,进行燃烧转爆轰实验.结果 表明,当光纤探针在DDT管内壁处时,只测得了药床爆轰阶段的速度信号;光纤探针在药床轴线位置处时,可以测得药床从燃烧转变为爆轰的整个变化过程.当DDT管水平放置时,装填密度在0.67～0.89 g/cm3的药床均出现了燃烧转爆轰现象;DDT管垂直或倾斜放置时,各种装填密度的药床均没有发生爆轰且燃烧远离点火头后中止.说明乳化粉状炸药没有足够的外界能量支持时,不能自持燃烧;探针位置和DDT管的放置方式直接影响到DDT实验结果.“,”To study the stability and safety of powdery emulsion explosives in the process of production,transportation,stor-age and use,the mechanism of Deflagration to Detonation Transition (DDT) was analyzed.Powdery emulsion explosive sam-ples with average particle sizes of 92,130 and 150 μmn were selected as the research objects.Experimental methods were de-signed to conduct DDT experiments on different loading densities\' beds by using a DDT tube sealing device.The results show that only the velocity signal of the detonation stage is detected when the fiber optic probe is located on the inner wall of the DDT tube.When the fiber optic probe is located at the axis of the explosive bed,the relative complete combustion and deto-nation velocity signals of the explosive bed are obtained.When the DDT tube is placed horizontally,the DDT phenomenon oc-curs in all the beds with the loading density of 0.67-0.89 g/cm3.When the loading density exceeds this range,the combus-tion of the beds is easily stopped,and the DDT phenomenon is difficult to occur.When the DDT tube is placed vertically or obliquely,no detonation occurs in the explosive bed with different loading densities,and combustion that keeping away from the ignition head is not propagated.It indicats that powdery emulsion explosives cannot burn by themselves without sufficient external energy support.The position of probes and the placement types of DDT tubes directly affects the results of DDT exper-iments.