Study on Reaction Kinetics Parameters and Combustion Phenomena of Li/SF₆

In order to investigate the combustion phenomenon and reaction kinetics parameters of Li/SF₆ under different temperature and pressure conditions, the Li/SF₆ combustion test platform with shock wave-induced high pressure thermal load excitation was used to measure the ignition delay period at the temperature of 830~1 400 K and the pressure range of 0.8~11 atm. The laws of Li/SF₆ combustion process and basic luminescence phenomena were investigated by the visual experiment section. Based on the typical Arrhenius dependence between ignition delay period and temperature and pressure, the reaction kinetics parameters were obtained by multiple linear regression method. The results show that the ignition delay period of Li/SF₆ combustion decreases with the increase in temperature and pressure, and the luminescence phenomenon gradually changes from a red isolated fire nucleus to a white bright flame with the increase in pressure. The pre-index factor A, exponential factor N, and activation energy E_a are obtained based on the experimentally measured ignition delay period, which provides an important basis for the identification of combustion characteristics and the construction of numerical simulation.