Die grundgleichungen des wanderfeld-MHD wandlers mit berücksichtigung der eisensättigung

Abstract

In this report it is shown that it is possible to take the magnetic potential difference within the iron into account by generalized boundary conditions. Thus, the calculation does not require the addition of a further field section for the iron; the number of integration constants is not increased. The iron saturation needs to be taken into account because for the operation of a self-excited MHD generator it is necessary to have a curved voltage-current characteristic. Furthermore, greater channel heights require establishing certain ranges of saturation within the iron, in order to get the desired curved voltage-current line. With small channel heights the problem of saturation might exist in avoiding saturation in certain parts of the magnetic circuit. In both cases the equations mentioned in this report are applicable. Moreover, preparations were made to describe the electrical working conditions of the MHD generator. By limiting operation to small slips and by implying saturation it is possible to define impedances, which, in principle, shows that the working condition of an MHD generator has some analogy to that of the conventional induction generator. A corresponding equivalent circuit could also be developed. The power and the losses are calculated according to the instructions in [1].