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考虑等离子体粘性时的扰动磁场

Impact of Viscosity and Radius of Cylindrical Plasma on Axial Disturbing Magnetic Field

  • 摘要: 从只考虑粘滞效应的非理想磁流体方程组出发,先应用半解析方法进行公式推导,然后数值计算了几种非均匀等离子体压强时,圆柱等离子体轴向扰动磁场随半径和粘度的演化规律。数值模拟结果表明:轴向扰动磁场在等离子体轴线位置处的值为零,而且这个值不受等离子体粘度,波数以及压强的影响。当等离子体压强一定时,轴向扰动磁场的极大值随着粘度的增加而增大。当粘度大到一定程度时,轴向扰动磁场在轴线和壁之间出现多个极大值和极小值,这表明了等离子体粘度对轴向扰动磁场的影响十分明显。

     

    Abstract: The interaction of an axial disturbing magnetic field and a viscous cylindrical-plasma was mathematically modeled, theoretically calculated in semi-analytical method, by deriving the approximated formula from non-ideal magneto-hydrodynamic equations involving viscosity, and numerically simulated. The influence of the plasma's properties; including the radius, viscosity, wave-number and pressure, on the radial distribution of the axial disturbing magnetic field was investigated. The simulated results show that the viscosity has a major impact. For example, as the viscosity increased at a given pressure, the maximum axial disturbing magnetic field increased; at a large enough viscosity, the magnetic field displayed the rippled radial profile, being zero at r=0 and independent of viscosity, wave number and pressure of the plasma. Moreover, at a fixed viscosity, the highest axial disturbing magnetic field decreased with an increase of the plasma's pressure.

     

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