Three-dimensional Numerical Simulation of Cylindrical Shaped Magnetohydrodynamic Generator under Strong Magnetohydrodynamic Interaction

摘要

The present study carries out three-dimensional numerical simulations of fluid dynamics and electrodynamics in a cylindrical and a rectangular shaped Faraday-type MHD generator with continuous electrodes under strong MHD interaction. An analytical condition is based on the experimentally operating condition of the pulsed MHD generator "Pamir-3U" with rectangular cross section. Numerical results show that the electric power output of cylindrical shaped MHD generator is almost the same as that of rectangular shaped MHD generator under low voltage condition. Under high voltage condition, the electric power output of cylindrical shaped MHD generator is larger than that of rectangular shaped MHD generator. The eddy current appears near insulating wall on cross section of cylindrical shaped MHD generator. Under the high voltage condition, the eddy current is caused by the difference of the electric field between the side of electrode edge and the others. Under the low voltage condition, the eddy current is due to the electromotive force directed opposite to the core current flow in the boundary-layer separation region.