环境压强对固体火箭喷焰电导率的影响

Influence of pressure of environment on conductivity of solid rocket exhaust plume

环境压强的变化会引起火箭喷焰中电子浓度、电子与分子的碰撞频率以及尘埃粒子充电频率发生变化,喷焰尘埃等离子体的电导率将因此发生变化。基于尘埃等离子体理论,研究了环境压强对火箭喷焰2000K温度区电导率的影响。研究表明,在某个特定的高度,对于一个特定的微波频率,火箭喷焰存在最大的电导率,这意味着随着高度的升高,火箭喷焰对微波可能存在一个衰减非常严重的区域,这一结论与实验观测到的现象是吻合的。

Change of environment pressure will induce change of electrons concentration, collision frequency between electrons and molecules and charging frequency in rocket exhaust plume, as a result, will lead change of conductivity of rocket exhaust plume which is in fact weakly ionized dusty plasma. The influence of the environment pressure on the dust plasma conductivity is studied on the basis of dusty plasma theory. It is found that the greatest conductivity of rocket exhaust plume with a temperature of 2000°K may be exist at a certain height and for a certain microwave frequency, which imply the most intensity microwave attenuation region during the ascent of rocket. The results are good agreement with the observed data from the experiments.