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轴向磁场中线性热势模型电弧的螺旋不稳定性 被引量:4

THE HELICAL INSTABILITY OF ARCS FOR LINEAR HEAT FLUX POTENTIAL MODEL IN AN AXIAL MAGNETIC FIELD
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摘要 采用线性热势电导率模型和与时间有关的线性微扰理论,给出了氢弧和其它气体中低电流弧的热势分布(温度分布)、稳定性条件以及不稳定性增长率等定量结果.与均匀电流分布比较,稳定性区域变大. The helical instability of an arc column with electrical conductivity of the distribution of the linear heat flux potential (a new 'temperature') is discussed in axial magnetic field. The magnetohy-drodynamic equations serve as the starting point of the theory. In an electrostatic approximation and a linear time dependent perturbation theory, the perturbation equations for the arc column movement are deduced. Solutions of these equations are obtained analytically, from which the stability limit of the cylindrical arc and the growth rate of the helical instability are given. In comparison the results with those of uniform current distribution, it is found that the stable area is enlarged.
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 1996年第4期608-618,共11页 Acta Physica Sinica
基金 国家自然科学基金资助的课题.
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