通电启动时固体推进剂电流密度仿真分析

Current density simulation of electrically controlled solid propellant when energized

电控固体推进剂(ECSP)克服了固体推进剂的固有障碍,能够做到重复启动,但燃烧不均和所需电源功率较大,导致较大尺寸ECSP的功能很难实现,限制了其进一步应用。由于通电启动时ECSP的电阻率变化不明显,可视其为准稳态。分别以电阻特性、电极布置、绝缘层厚度与长度为单一变量,对此时的电流密度分布进行三维模拟,仿真方法的可行性通过实验得到了验证。分析表明,当采用板状电极或同轴电极的通电方式时,减小电极间距将有利于ECSP端面电流密度分布的更加均匀,ECSP的电阻率、绝缘薄膜顶部距ECSP端面的距离等因素也会对ECSP端面的电流密度产生很大影响。据此提出了优化的电极排布形式和绝缘层布置,可为今后的ECSP应用作参考。

Electrically controlled solid propellant（ECSP） has overcome the inherent obstacles of solid propellant,which can be restarted. However, the uneven combustion and high power consuming, which result in the difficulty in achieving the functions of large ECSP, have become the main constraints to its application.As the resistivity of ECSP is not changed obviously when it is just activa- ted, this process can be considered as a quasi-stable state.In this work, resistivity, electrode arrangement, insulation thickness and length are separately set as single variables, the current density distribution is simulated and the feasibility of simulation method is verified by the experiments.The analysis shows that when a plate electrode or coaxial electrode is used, it will be beneficial for the distribution of the current density by reducing the distance of electrodes. Besides, factors including the resistivity of ECSP, the distance between the insulating layer＇ s upper face and ECSP＇ s face, have a great effect on the current density of the ECSP＇ s face. Thus,the optimized electrode configuration and insulation layer layout are presented, providing reference for ECSP applications in the future.