高超声速磁流体数值模拟研究

Research on numerical simulation of hypersonic MHD

高超声速流动情况下,气流经过强激波后温度升高,发生电离和离解,导致局部存在等离子流并进而产生诱导磁场和电场,流动经过与磁场、电场的相互作用变得更加复杂。如果在高超速流场中人为加入磁场,则可以改变流场结构,实现对流动的控制,达到减阻、热防护等目的。首先完成了磁流体力学控制方程推导,然后对FLUENT软件进行二次开发,使其具备磁流体力学控制方程即MHD的数值模拟能力,最后进行了高超声速钝头体MHD流动的数值模拟研究。

In hypersonic flows,the air temperature will increase after the strong shock wave,then ionization and dissocia-tion would occur and results in plasma stream exits locally,and thus generates induced magnetic field and electric field,so the flows become more complex after interaction. If the magnetic field is added to the high-speed flow field artificially,the flow structure would change,thus realize the control of flow,and achieve purposes of drag reduction and thermal protection. The MHD governing equations is deduced firstly,and then the secondary development of FLUENT software is conducted to achieve MHD numerical modelling capabilities. Finally a hypersonic blunt body MHD flow numerical simulation is researched.