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为研究液体火箭发动机真空羽流对微波的衰减作用,以某双组元液体火箭发动机为对象,使用热力计算程序对燃烧室内的电子数密度进行了计算,使用冻结假设和有限化学反应速率假设两种情况对喷管内带电粒子的电离和再结合过程进行了模拟,并对羽流中带电粒子数密度和5~30GHz微波穿过羽流的衰减量进行了估算.研究结果显示:该发动机燃烧室和喷管出口的电子数密度量级分别为1013~1014cm-3和1010~1011 cm-3,K,Na等碱金属为主要电子释放剂,Cl-,OH-等基团为主要电子吸收剂;低频微波在羽流中衰减更严重,5GHz微波的衰减可达4.5dB;微波斜穿羽流的衰减通常大于横穿情况.
In order to study the decay effect of vacuum plume of liquid rocket motor on microwave, a two-component liquid propellant rocket engine is used to calculate the electron number density in the combustion chamber by using a thermal calculation program. Using the assumption of freezing and the limited chemical reaction rate, two The ionization and recombination processes of charged particles in the nozzle were simulated and the number density of charged particles in the plume and the attenuation of 5 ~ 30GHz microwave passing through the plume were estimated.The results show that the combustion chamber And electron density at the outlet of the nozzle were 1013 ~ 1014 cm-3 and 1010 ~ 1011 cm-3, respectively. The alkali metal such as K and Na was the main electron releasing agent, while Cl-, OH- and other groups were the main electron absorbers ; Low-frequency microwave attenuation more serious in the plume, 5GHz microwave attenuation up to 4.5dB; Microwave oblique plume attenuation is usually greater than the crossing.