HAN 基电控固体推进剂电化学性能对燃烧性能的影响

HAN (hydroxylamine nitrate)-based electronically controlled solid propellant is a new intelligent propellant mainly with HAN as oxidant‚and the combustion rate and start-stop could be controlled through external power supply.To explore the relationship between electrochemical performance and combustion performance of electronically controlled solid propellant‚the ion mobility and overpotential changes of propellant will be studied and correlated with the ignition voltage and ignition delay of the propellant.The ion mobility of propellant is positively correlated with voltage under the stimulation of the external low voltage (from 1.6 V to 2.8 V)‚and the effect of improvement of propellant matrix in increasing the ion mobility is greater than that of ion doping.In terms of combustion performance‚ion mobility affects the ignition voltage‚and the overpotential determines the ignition delay.The enhanced ion mobility will increase the current density and reactivity of the propellant.When increasing the mobility from 0.09 mm²·s^-1·V^-1 to 0.16 mm²·s^-1·V^-1‚the ignition voltage is reduced from 210 V to 70 V‚which is conducive to broadening the application range of electronically controlled solid propellants.When the ignition voltage is fixed‚the smaller propellant overpotential is the greater the decomposition rate is‚and the smaller the ignition delay is.When the overpotential is reduced from 0.67 V to 0.51 V‚the ignition delay is reduced from 1.68 s to 0.31 s‚which is conducive to the strategic needs of the propellant to achieve rapid response.