基于碱金属辅助电离的等离子鞘套模拟方法

A Plasma Sheath Reproducing Method Based on Adding Alkali Metal to Promote Ionization

为解决再入过程中通信黑障与探测异常问题,对等离子体鞘套地面模拟方法进行了研究。以RAM C-II飞行试验为依据,计算了等离子体鞘套的参数范围。分析现有模拟设备,概括提出了高焓低速风洞的模拟方案,选取相适应的放电方式,并对流量功率进行了计算。针对高温环境对电磁设备造成损坏以及所需功率难以实现的问题,提出添加碱金属的解决方案,并进行了试验验证。试验结果表明,添加碱金属可以使电子密度提升约一个数量级。对方案效果进行评估,预期功率需求降至兆瓦量级。

In order to solve the communications blackout and signal distortion during the reentry process,the plasma sheath reproducing method is studied. Based on the RAM C-II flight experiment,the parameter of the plasma sheath is calculated. By analyzing the existing equipment,the reproducing scheme of high enthalpy-low velocity wind tunnel is proposed. Two kinds of the discharge methods are more appropriate. The expected mass flow and power are calculated.Aiming at the problems that the high temperature can cause damages to the electromagnetic equipment and the required power is hard to realize,a solution of adding alkali metal is proposed and verified. The results of the experiments indicate that the electron density can increase by one order of magnitude by adding alkali metal. It＇s estimated that the required power will decrease to the order of megawatts.