Das problem der endlichen breite bei induktiven mehrphasen-mdh-wandlern

The author investigates the influence of the finite breadth on the performance of rectangular MHD-converters. It is shown that in the case of an isotropic fluid the electrical current extends in two dimensions, and that there exist no currents in y-direction. As expected an increasing resistance of the lateral conductor will enlarge the losses at constant power of the MHD converter. The maximum output of a sodium converter with copper lateral conductor will scarcely be diminished, compared with the limiting case of an infinitely broad converter if, according to conditions of this calculation, the magnetic field coupled with the lateral conductor may be neglected and the ratio b/τ is not too little. If one diminishes the conductivity of the lateral conductor by choice of appropriate materials or by decreasing the cross section, there will be decreased the maximum output and the losses. The deformation of the current location-curve may be explained by a decoupling between primary and secondary part, increasing with enlarged -component of the electrical currents. The influence of the ratio b/τ is strongest at ρ_s = ∞. As the calculations show, in the case of narrow converters (b/τ < 1) the lateral conductor should have a particularly high conductivity to avoid additional losses of the lateral conductors. Taking into consideration these points of view, it seems possible to construct inductive multiphase converters with copper as lateral conductor material, in which the additional losses, caused by two dimensional current distribution in the conductive fluid, are limited to tolerable amount.