Theory and MHD simulation of fuelling by compact toroid injection
Theory and MHD simulation of fuelling by compact toroid injection
复制标题
紧凑环形喷射燃料的理论和MHD模拟
DOI：
10.1088/0029-5515/41/7/308
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发表时间：
2001
期刊：
影响因子：
3.3
通讯作者：
Y. Kishimoto
中科院分区：
文献类型：
--
作者：
Y. Suzuki;T. Hayashi;Y. Kishimoto
用MHD数值模拟方法研究了类球形致密环(SCT)注入聚变装置对应的磁化靶等离子体区域的燃料过程。在以前的研究中，作者根据模拟结果提出了一个确定SCT对靶区侵彻深度的理论模型；在该研究中，SCT不仅受到磁压力的减速，而且还受到磁拉力的减速。然而，由于模拟中目标磁场的两端都固定在边界墙上，因此磁拉力引起的减速会被高估。本文研究了靶场边界条件对SCT穿透过程的影响。在此基础上，对以前提出的理论模型进行了改进，考虑了目标磁场的起伏随Alfven速度传播的影响。此外，通过环面区域的数值模拟，证实了该理论模型可以用于估算该条件下SCT的侵彻深度。此外，还研究了喷射位置(侧面喷射和顶部/底部喷射)对穿透过程的影响。
The process of fuelling by injection of a spheromak-like compact toroid (SCT) is investigated by using MHD numerical simulations, where the SCT is injected into a magnetized target plasma region corresponding to a fusion device. In a previous study, the authors proposed a theoretical model to determine the penetration depth of the SCT into the target region on the basis of simulation results; in that study the SCT is decelerated not only by the magnetic pressure force but also by the magnetic tension force. However, since both ends of the target magnetic field are fixed on the boundary wall in the simulation, the deceleration caused by the magnetic tension force would be overestimated. In the present study, the dependence of the boundary condition of the target magnetic field on the SCT penetration process is examined. On the basis of these results, the theoretical model previously proposed is improved to include the effect that the fluctuations of the target magnetic field propagate with the Alfven velocity. In addition, by carrying out the simulation with the torus domain, it is confirmed that the theoretical model can be applied to estimate the penetration depth of the SCT under such conditions. The dependence of the injection position (side injection and top/bottom injection) on the penetration process is also examined.