Slag Deposition and Its Effect on the Performance of MHD Channels

摘要

The performance of MHD channels in the presence of surface slag coating is analyzed. The analytical model includes three parts, which are solved iteratively. The first part solves the steady-state, two-dimensional MHD flow equations for the inside of the channel. The second solves the slag flow equations of motion, and the third predicts the slag deposition rate by solving a set of diffusion equations for the slag vapor and slag particles. Source terms are included for both nucleation and vapor condensation on the particles formed. The analytical model is applied to find the performance of the U.S. channel design for the U-25 facility without slag and with 10% and 30% slag carryover, over a wide range of wall temperatures (800 to 2000 exp 0 K). The analaytical results show an improvement in the channel power output, particularly for low surface temperature. The slag surface temperature and channel power output are almost independent of the surface temperature for surface temperature