RDX聚光点火和反应过程的光学诊断

In order to expand the experimental methods of the ignition and combustion characteristics of energetic materials under condensing ignition, the species changes and chemical reactions in the combustion reaction process were explored. Based on the condensing ignition platform, the self-luminescence process of RDX reaction, the change of NO chemiluminescence signal and the two-dimensional concentration distribution of OH radical in RDX flame before and after condensing ignition were studied by means of high-speed photography, chemiluminescence and laser-induced fluorescence. The results show that the RDX condensing ignition and reaction process is divided into four stages, which are endothermic, evaporative pyrolysis, ignition and end of reaction. The ignition delay time of the whole reaction process is 16.735s and the combustion duration is 355ms. The high delay is due to the low condensing ignition energy. The chemiluminescence of NO shows that there is an obvious two-stage process of NO production, and the production of NO is affected by RDX steam and various decomposition products like HCN and NO₂. The high concentration area of OH is mainly distributed on the two wings of the flame middle, which can be produced by the reaction of NO.