高超声速飞行器等离子鞘套中的电磁波传播

高速飞行器再入时表面形成的等离子鞘套对飞行器的通讯联络、飞行控制产生不可忽略的影响,导致“黑障”现象。采用压力权函数修正的迎风型矢通量分裂格式(modified advection upstream splitting method by introducing the pressure based weight functions, AUSMPW+),求解Navier Stokes方程组,计算了包覆流场中的电子密度及等离子鞘套对电波的衰减,并且根据电磁窗口装置原理图,对非均匀磁化等离子体中的电波传播进行了仿真。结果表明，增强磁场可明显减小磁窗内的电子密度,有效降低等离子体鞘套对电磁波的衰减。

Electromagnetic wave propagation in plasma sheath of hypersonic vehicles

A vehicle flying at high velocity in the atmosphere is surrounded by plasma sheath that affects the propagation of electromagnetic waves to and from the vehicle. This plasma sheath causes an important system operation problem known as communications blackout or radio blackout. The Navier Stokes set of equations is solved, using the an advection upstream splitting method modified by the pressure based weight functions(AUSMPW+). The electron density distribution is obtained and the amount of attenuation of the signal is calculated. According to the “electromagnetic window” schematic, the propagation of electromagnetic wave in an inhomogeneous magnetized medium is simulated. Simulation results show that the electron density decreases by increasing the magnetic intensity in the electromagnetic window and this method can decrease the attenuation of electromagnetic wave propagation in plasma sheath efficiently.