【作者】 曹鹤飞； 孙永卫； 原青云； 许滨；

【Author】 Cao He-Fei;Sun Yong-Wei;Yuan Qing-Yun;Xu Bin;Electrostatic & Electromagnetic Protection Institute,Ordnance Engineering College;Department of physics,Shijiazhuang College;

【机构】 军械工程学院静电与电磁防护研究所； 石家庄学院物理系；

【摘要】 氢氧发动机在运行过程中喷管内由带电粒子产生的静电对飞行器带来不利影响。本文综合考虑氢氧发动机喷管火焰中带电粒子质量、温度、密度以及发动机喷管内表面材料二次电子效应等因素,基于气体动理论,利用Maxwell粒子速度分布函数,经过理论计算得到氢氧发动机喷管处内部表面充电电压一般表达式。研究发现氢氧发动机喷管受到电子和离子的作用,表面形成大量电子聚集,产生负一定负电位。当喷管内部电子的温度保持不变时,表面电位随着H+浓度与电子浓度之比的增大而降低。当H+浓度与电子浓度之比保持不变时,表面电位随着电子温度的增加而升高,发动机喷管内部负电位大小一般在几伏范围内。更多还原

【Abstract】 The electrostatic charging caused by charged particles in the nozzle can degrade the aircraft performance while the H2/O2 rocket engine is in operation。Based on the kinetic theory of gases,this paper applies the Maxwell velocity distribution function of the particles to formulate a general equation of the internal surface at the H2/O2 rocket engine nozzle。Factors such as the mass,temperature and density of the charged particles and the secondary electronic emission by the internal surface materials of the nozzle are considered hypothetically。The surface charging electric potential of varied cases is analysed and the charging properties are summarized。The effect of electrons and ions on the H2/O2 rocket engine nozzle is evident,mass electrons assembling on the surface and negative electrical potential comings into being。The highest temperature in the engine nozzle is approximately several thousand K,so the surface negative electrical potential is also approximately several V.更多还原