喷口电弧二维磁流体动力学（MHD）数学模型

为了揭示电弧在开断过程中的复杂物理现象,建立的喷口电弧二维磁流体动力学数学模型,强调了电弧、气流、电磁场三者的相互作用,消除了因忽略Ｌｏｒｅｎｔｚ力和电流密度径向分量引起的物理意义失真．应用有限元法对模型中Ｎ－Ｓ（ＮａｖｉｅｒＳｔｏｋｅｓ）方程和二维电磁场方程进行数值求解．数值计算结果反映了Ｌｏｒｅｎｔｚ力以及电流密度径向分量对电弧特性的影响,同时揭示了电弧热边界区的存在．     

Influence of Hall effects on characteristics of magnetohydrodynamic converging channel

Influences of Hall effects on the flow characteristics and performance of the magnetohydrodyanmic (MHD) converging channel as an MHD generator are studied numerically in the present study. The numerical algorithm used is composed of an entropy conditioned scheme for solving the non-homogeneous Navier-Stokes equations, in conjunction with an SOR method for solving the elliptic equation governing the electrical potential of the electric field. It is found that Hall effects may lead to distortions in both the ...     

等离子激励器对附面层的诱导作用

对等离子体发生器诱导低速流动流体附面层的流畅场热性进行了数值模拟.研究了等离子体发生器激励强度、等离子体发生器尺寸、主流速度等对低速流动流体的附面层诱导作用.研究中的等离子体由射频发生器产生,结果表明,等离子体发生器对低速流动流体的附面层有较大影响.该研究成果可用于飞行器头部、机翼及发动机叶片的附面层及流动分离的控制,改善飞行器及发动机的流场特性.     

ITER中的离散阿尔芬本征模

本文主要研究了ITER稳态运行时的离散阿尔芬本征模的稳定特性。这些磁流体力学本征模是α引起的气球模驱动势阱中的束缚态。其中,α=-q2Rdβ/dr,q是安全因子,β是等离子压强和磁场压强的比值,R和r分别是环形等离子体的大半径和小半径。这些阿尔芬本征模很容易被高能量粒子激发而演变成不稳定模式而影响环形等离子体的约束性能。     

Observation and simulation of flux rope structures at the dayside magnetopause

The signatures of flux ropes with obvious core magnetic field are detected by Cluster Ⅱ at the dayside magnetopause during 11:00--11:15 UT on Mar. 2, 2001. The similar characteristics can be found from the magnetic fiel dvariations recorded by the four spacecrafts (Cluster Ⅱ C1--C4). All the three (-/ ) bipolar signatures in the BN component are accompanied with enhancements of BM and magnetic field strength B in the boundary normal coordinates (LMN coordinates). A MHD simulation with two dimensions and three components is performed to explore the reconnection process driven by the incoming flow of solar wind at the dayside magnetopause. The numerical results can illustrate the recurrent formation of magnetic structures with a core magnetic field. The time history of the magnetic field B and three components Bx, By and Bz at a given point of the current sheet can reproduce the observational features of the events mentioned above.     

在多孔平板磁流体动力边界层吹吸与热辐射对流动影响

存在磁场时对多孔通道平板边界层流动和传热进行分析,无滑动边界条件相对应的、不同的速度滑移和温度滑移;并在温度方程中考虑热辐射条件。相应的动量和能量方程为非线性常微分方程;并将其进行相似变换。通过龙格库塔的计算方法获得这些方程的数值解。结果发现,增加滑移参数以及增加磁参数时,水平速度减少;增加的磁参数而温度增加;增加热滑参数而温度降低;热辐射增强了有效热扩散率并使温度上升。     

SUNIST球形托卡马克MHD不稳定性的探讨

托卡马克已经逐步成为磁约束聚变研究的主流,本文介绍了中国联合球形托卡马克SUNIST上的磁流体力学（MHD）不稳定性的测量和分析,提出了控制不稳定性的设想。