等离子体点火密闭爆发器中火药燃速特性的研究

等离子体与火药的作用规律是影响电热化学发射中能量利用效率的关键因素。研制了采用等离子体点火的密闭爆发器实验系统,对单基药在等离子体作用下的燃烧特性进行了研究。结果表明:等离子体点火可以显著缩短火药的点火延滞时间;实现有效点火的电能的最低阈值低于0.05kJ/g;输入电能可以显著增加火药的燃速。等离子体对所用单基药燃速的增强效果仅体现在电脉冲注入期间,但是随着电能输入的增加,逐渐显示出等离子体注入期后火药燃速增强的趋势。

Propellant burn rate characteristics in closed bomb ignited with plasma

The interaction of plasma with propellant is the pivotal factor that influences energy efficiency of electrothermal chemical launch. An experimental system of closed chambeer with plasma igniter is developed. The characteristics of burn rate of single base propellant with the presence of plasma are investigated. Experimental results show that plasma ignition reduces propellant ignition delay markedly. The minimal threshold of ignition energy density is less than 0.05 kJ/g. The propellant exhibits enhanced burn rate with the increase of input electric energy. The enhancement of burn rate of single base propellant is only obvious in the period of electric pulse injection. When high electric energy injects into the chamber, there also exists tendency of regression rate enhancement after the plasma injection.