Abstract
A conceptual design of transonic disk MHD channel is carried out, for a power generation system with liquefaction-recovery of CO2. A previous study has shown that the subsonic disk MHD channel has rather poor performance, and that the supersonic disk channel yields sufficiently high power output although its stability should be improved. The present paper proposes the transonic disk channel which can be stably operated with high power output. It is assumed that the transition between supersonic flow and subsonic flow is accompanied with a cylindrical shock wave in the channel. The transonic channel yields the enthalpy extraction ratio of 20.2% and 22.9%, respectively, for the thermal input of 1100MW and 2000MW, which is nearly equal to the performance of supersonic channel. The stability of transonic disk channel is examined by γ-θ two-dimensional time-dependent calculations. The two-dimensional analysis shows that the transonic disk channel works stably with fewer load sections than the supersonic channel even when inlet perturbations are added.
