MHD design analysis of an annular linear induction electromagnetic pump for SFR thermal hydraulic experimental loop

Abstract

The design variables of an annular linear induction electromagnetic pump (ALIP) for SFR thermal hydraulic experimental loop were analysed magnetohydrodynamically. The theoretical model of ALIP was configured for magnetohydrodynamic (MHD) analysis. Mathematical equations for the developed pressure, generated by Lorentz electromagnetic force and hydraulic efficiency were derived. The developed pressure was found to be a function of design variables, including the geometrical variables of pump core length, inner core diameter and flow gap, and the electromagnetic ones of turns of coils, frequency and input current. The developed pressure from the MHD analysis was compared and identified with the developed pressure derived by an equivalent circuit method leading to Laithewaite's standard design formula for a linear induction electromagnetic pump. The design characteristic of the electromagnetic pump was analyzed according to the change of the pump's geometric and electromagnetic variables, taking into account hydraulic friction pressure loss in the narrow annular gap of the pump. The design specification of ALIP with a flow rate of 900 L/min and a developed pressure of 4.5 bar was drawn from the characteristic analysis of the variables.