Abstract
Two-dimensional numerical simulations taking into account the boundary layer were carried out to confirm the mechanism of improvement in enthalpy extraction ratio with enhancing the area ratio of generator and with introducing the inlet swirl. For the generator having the large area ratio, static pressure is kept low throughout the MHD channel against the Lorentz force, and higher gas velocity and Hall parameter results in the improvement of generator performance due to large electromotive force. Introduction of inlet swirl also results in low static pressure and high Hall parameter, and high enthalpy extraction ratio can be achieved. Lorentz force gives rise to characteristic secondary flow field in azimuthal velocity component.
