Technical Research On Electronically Controlled Solid Propellant Power Plant

Electric Solid Propellants(ESPs)are capable of multiple ignitions,extinguishments and throttle control by the application of electrical power.When a non-metalized ESP grain is fitted with electrodes and sufficient electrical power is applied,it ignites and continues to burn energetically until the electrical power is removed.In this work,the ignition characteristic and combustion characteristic of ESP have been studied,an electric solid propellant motor has been designed.The working characteristic of the electric solid motor has been studied by static firing test.An end-burner with layered electrodes was used to investigate the ignition characteristics of electric solid propellants at ambient pressure.Test results indicated that electrode material,current density and electrode polarity are key factors influenced the ignition characters of ESP.The ignition preferentially happened in the active metal electrode surface.The initially ignition of ESP happened in the larger current density surface with the same electrode material.ESP preferentially ignites at the anode with the same current density.The combustion control technology of ESP has been studied.Test results indicated that the layered electrodes configuration is optimal.The contact area of electrode to ESP grains is actually the burning surface of ESP.The shower electrode is optimal electrode shape.The combustion mechanism of ESP has been studied and an electrolysis-electric heating coupling combustion theory was proposed.The burning rate measurement method of ESP has been studied.The LVDT method and self-extinguished method have been proposed.The burning rate characteristic of ESP by throttle applied voltage has been studied.Test result indicated that r=a+b U.An electric solid propellant motor has been developed.The mathematical model of thrust control is established.The static firing test results indicated that the electric solid propellant rocket motor can realize multiple start-ups and self-extinguish.Moreover,start-up and shut-down times can be regulated randomly.By adjusting the applied voltage,the electric solid propellant motor can achieve thrust control randomly and thrust the regulation ratio reaches 1.8.