Abstract
Fluctuation of plasma properties in nonequilibrium disk MHD generators and its effects on generator characteristics are discussed by numerical simulation, taking account of the fluctuation of seed fraction at the inlet of the generators. Effective electrical conductivity and effective Hall parameter are reduced due to the fluctuation of plasma properties when the partially ionized seed appears. The reduction of these values deteriorates the enthalpy extraction ratio of generators. It is found that the deterioration of enthalpy extraction ratio becomes large when the external load resistance is around the optimum value. It is also found that the distributions of properties along the radial direction become smooth as seen in the experimental data when the fluctuation of seed fraction is taken into account.
