Exact solutions to magnetized plasma flow
Exact solutions to magnetized plasma flow
复制标题
磁化等离子体流的精确解
DOI：
10.1063/1.1343505
复制
发表时间：
2001
影响因子：
2.2
通讯作者：
C. Barnes
中科院分区：
文献类型：
--
作者：
Zhehui Wang;C. Barnes
利用理想磁流体理论，给出了稳态磁化等离子体流的精确解析解。我们考虑了几个案例。当考虑等离子体流时，速度梯度可以使有限的等离子体压力梯度∇p保持在无力状态J×B=0。对于Taylor态球面B场，讨论了不可压缩和可压缩MPF的例子。对于U∥B可压缩等离子体，给出了一种新的磁化喷嘴解，当B场足够强时，磁化喷嘴向磁化喷嘴转变是可能的。在磁喷嘴外壳中不需要物理喷嘴。文中还给出了U⊥B时的扩散型、鼓型和喷嘴型MPF解。需要电场来平衡欧姆定律中的U×B项。利用所提出的导电电极，可以在实验室中产生电场。如果这样的电场也存在于恒星和星系中，例如通过发电机过程，那么这些解就可以用来解释。
Exact analytic solutions for steady-state magnetized plasma flow (MPF) using ideal magnetohydrodynamics formalism are presented. Several cases are considered. When plasma flow is included, a finite plasma pressure gradient ∇p can be maintained in a force-free state J×B=0 by the velocity gradient. Both incompressible and compressible MPF examples are discussed for a Taylor-state spheromak B field. A new magnetized nozzle solution is given for compressible plasma when U∥B. Transition from a magnetized nozzle to a magnetic nozzle is possible when the B field is strong enough. No physical nozzle would be needed in the magnetic nozzle case. Diverging-, drum- and nozzle-shaped MPF solutions when U⊥B are also given. The electric field is needed to balance the U×B term in Ohm’s law. The electric field can be generated in the laboratory with the proposed conducting electrodes. If such electric fields also exist in stars and galaxies, such as through a dynamo process, then these solutions can be candidates to expla...