A two-scale hydromagnetic dynamo experiment

被引:45
|
作者
Müller, U
Stieglitz, R
Horanyi, S
机构
[1] Forschungszentrum Karlsruhe, Inst Kern & Energietechs, D-76344 Eggenstein Leopoldshafen, Germany
[2] KFKI, Atom Energy Res Inst, Budapest, Hungary
关键词
D O I
10.1017/S0022112003006700
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The Karlsruhe Dynamo experiment is aimed at showing that an array of columnar helical vortices in liquid sodium, confined in a cylindrical container, can generate a magnetic field by self-excitation. In three test series it has been demonstrated that magnetic self-excitation occurs and a permanent magnetic saturation field develops which oscillates about a well-defined mean value for fixed flow rates. Dynamo action is observed as an imperfect bifurcation from a seed magnetic field of the environment. Two quasi-dipola magnetic fields of opposite direction have been realized. A transition between these two states can be enforced through imposition of a sufficiently strong external magnetic perturbation on the existent dynamo field. These perturbations were induced with the aid of two Helmholtz coils. A time series analysis of the magnetic field fluctuations shows several characteristic dynamic features, which are in agreement with theoretical predictions from turbulence models available in the literature.
引用
收藏
页码:31 / 71
页数:41
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