火药燃烧等离子体电导率理论计算研究

基于火药燃烧等离子体低温、高压、瞬态的弱非理想性质,提出了综合考虑电子与离子、电子与中性粒子碰撞作用的电导率计算模型。通过计算含电离种子K_2CO_3发射药燃烧产物的电子密度和电导率,揭示了火药燃气电子密度和电导率随温度、时间的变化规律。结果表明:在2 000~3 000K范围内,火药燃气的电子密度和电导率随温度的上升而增大;火炮发射过程中,火药燃气的电子密度和电导率随时间逐渐减小,且呈非线性下降趋势。初始时刻,电子密度ne和电导率σ最大,分别为2×10~(22)m~(-3)、705.6 S/m。

Theoretical Calculation Research of Electrical Conductivity of Plasma in Combustion of Gunpowder

Based on the weakly non-ideal properties of low temperature, high pressure and transient of plasma in combustion of gunpowder, a conductivity calculation model considering the interaction between electrons and ions, electrons and neutral particles was proposed. By calculating the electron density and the conductivity of combustion products of composite propellant containing the ionized seed K2CO3, the variation regularity of electron density and conductivity of gunpowder gas with temperature and time was revealed. The results show that the electron density and electrical conductivity of the gunpowder gas increase with the rise of temperature in the range of 2000 ~ 3000K, during the course of gun fire, the electron density and electrical conductivity of gunpowder gas decrease gradually with time as a non-linear downward trend. At the initial time, the electron densityne and the conductivityσ are the largest, which are 2×1022m-3, 705.6S/m respectively.