高超声速飞行器等离子体鞘套电子数密度电磁复合调控机理研究

高超声速飞行器再入过程中高温气体电离形成等离子体鞘套，由此带来的通信黑障和探测异常问题严重影响着与地面的通信、导航，甚至导致飞行安全问题。等离子体鞘套中的电子数密度是造成通信黑障的关键参数，降低电子数密度对于解决通信黑障问题具有重要意义，然而目前缺乏有效的电子数密度降低手段。本项目采用等离子体鞘套电子数密度的非定常电磁复合调控方法，建立考虑化学反应的等离子体鞘套电磁调控多场耦合模型，获得不同强度和分布的电场、磁场作用下，电子数密度的时空响应规律，揭示电磁调控下等离子体鞘套中的流-电-磁-化非定常耦合机理。在此基础上，开展等离子体鞘套电子数密度电磁调控实验研究，探索不同等离子体鞘套参数下的电磁复合调控能力。项目成果将为等离子体鞘套通信屏蔽问题的改善提供理论和技术支撑。

Plasma sheath is generated from the ionization of the high-temperature air during the re-entry of hypersonic vehicle, leading to blackout and detection problems. These problems seriously affect the radio communication with the base, as well as the navigation for the flight, even the vehicle safety. The number density of the electrons in the plasma sheath is a key parameters determining the blackout; hence, it is promising to reduce the electron number density to solve the blackout problem. However, we still lack an effective method to reduce the electron number density. In this project, unsteady electromagnetic method is adopted to manipulate the electron number density in the plasma sheath. Multi-filed coupling model with chemical reaction in the hypersonic flow is stablished for the electromagnetic manipulation of plasma sheath. According to the model, numerical simulation is conducted to investigate the influence of electric and magnetic strength and distribution on the electron number density distribution in the plasma sheath. The analysis on the numerical results also reveal the flow-electric-magnetic-chemical field unsteady coupling mechanism. Based on the numerical research, the experimental research is conducted to explore the capability of electromagnetic manipulation on the plasma sheath. The results on this project will lay theoretic and technical foundation for the solution of blackout of plasma sheath.