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[2G04] Experimental study of MHD pressure drop reduction by electrical insulating α-Al2O3 layer in liquid LiPb breeder blanket systems
Keywords:Fusion reactor, Liquid metal blanket, MHD pressure drop, Magnetohydrodynamics, FeCrAl alloy
Large MHD pressure drop is an important issue of liquid LiPb breeder blanket systems in magnetic confinement fusion reactors. FeCrAl alloys form α-Al2O3 layer and unalloyed zirconium forms ZrO2 layer by oxidation treatments, and they can function as an electrical insulating layer to reduce the MHD pressure drop. The liquid metal flow apparatus was constructed to verify the reduction of MHD pressure drop by the electrical insulating oxide layers. Liquid PbBi alloy will flow in a circular tube at 200 ℃ under the magnetic field of 0.6 T (Ha = 43). The results of analytical calculation indicated that 57 % of MHD pressure drop is reduced when the tube inner wall is electrically insulated by the oxide layers.
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