液态钠湍流的间歇磁场激发
Intermittent magnetic field excitation by a turbulent flow of liquid sodium
摘要：
麦迪逊发电机实验中测得的磁场表明，当施加轴向磁场时，会出现间歇性的增长。间歇性场的几何形状是一致的增长最快的磁本征模预测的运动发电机理论使用层流模型的平均流量。虽然平均流的本征模衰减，它是假设，湍流的速度场的波动改变流动的几何形状，使本征模的增长率是暂时的积极。因此，可以预期，湍流发电机的开始的特征是磁不稳定性。
英文摘要：
The magnetic field measured in the Madison Dynamo Experiment shows intermittent periods of growth when an axial magnetic field is applied. The geometry of the intermittent field is consistent with the fastest growing magnetic eigenmode predicted by kinematic dynamo theory using a laminar model of the mean flow. Though the eigenmodes of the mean flow are decaying, it is postulated that turbulent fluctuations of the velocity field change the flow geometry such that the eigenmode growth rate is temporarily positive. Therefore, it is expected that a characteristic of the onset of a turbulent dynamo is magnetic intermittency.
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