No abstract

The reaction mechanism of UDMH and NTO propellant vapor under storage condition was analyzed in order to develop emergency measures for propellant leakage in extreme cases. The distribution of propellant vapor concentration, reaction products and temperature in a closed space were studied by numerical simulation. According to the results of numerical simulation, the propellant concentration distribution, resultant of reaction distribution, as well as temperature distribution was obtained. Results showed that the leakage diffusion process can be divided into three stages: heavy gas deposition stage, rapid reaction stage and equilibrium diffusion stage. In the heavy gas deposition stage, propellants are mainly affected by gravity. During the rapid reaction stage, the chemical reaction between propellants plays a certain role in the diffusion process. In the equilibrium diffusion stage, the bottom temperature of the confined space increased significantly, the highest temperature reached 306K.