磁场对激波冲击R22重气柱作用过程影响的数值模拟

发布时间：2018-08-14 10:28

【摘要】：为研究平面入射激波与磁化R22重质圆形气柱的作用过程,首先通过数值方法得到了不同初始条件下激波诱导R22气柱的Kelvin-Helmholtz(KH)及Richtmyer-Meshkov(RM)不稳定性导致的重气柱变形过程,并详细讨论了不同情况下透射激波在气柱内聚焦诱导射流的过程;然后在加入磁场的情况下,采用CTU+CT算法进行数值模拟,以保证数值结果满足任意时刻磁场的散度为零。计算结果表明:磁场对激波诱导R22气柱不稳定性具有抑制作用;法向磁场和流向磁场都可以很好地抑制RM不稳定性;对于KH不稳定性,法向磁场的控制效果更好,不仅可以抑制界面上涡串的卷起,还可以阻止主涡的发展,而流向磁场做不到后者;磁场对射流影响不大,射流处的磁能量可以一定程度上抑制射流的衰减,同时法向磁场可以减小聚焦时压力及速度峰值。
[Abstract]:In order to study the interaction between plane incident shock wave and magnetized R22 heavy circular gas column, the deformation process of heavy gas column caused by shock wave induced by Kelvin-Helmholtz (KH) and Richtmyer-Meshkov (RM) instability of R22 gas column under different initial conditions is first obtained by numerical method. The process of transmitting shock wave focusing induced jet in gas column under different conditions is discussed in detail, and then the numerical simulation is carried out by CTU CT algorithm under the condition of adding magnetic field to ensure that the numerical results satisfy the zero divergence of magnetic field at any time. The results show that the magnetic field can restrain the instability of R22 gas column induced by shock wave, both the normal magnetic field and the flow magnetic field can suppress RM instability, and for KH instability, the control effect of normal magnetic field is better. It can not only restrain the winding of the vortex string on the interface, but also prevent the development of the main vortex, but the direction magnetic field can not do the latter. The magnetic field has little effect on the jet, and the magnetic energy at the jet can restrain the attenuation of the jet to some extent. At the same time, the normal magnetic field can reduce the peak value of pressure and velocity in focusing.
【作者单位】：南京理工大学瞬态物理国家重点实验室;
【基金】：国家自然科学基金项目(11272156) 中国博士后科学基金项目(2015M571757)
【分类号】：O354.5

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