Numerical Simulation Of The Influence Of Geometric Shape On The Rectangular Duct Flow Of Magnetic Fluid

The thermonuclear fusion reactor is one of the important ways to solve the problem of clean energy in the future.The experimental blanket is a key component of the thermonuclear fusion reactor,which is mainly used for tritium production and energy acquisition experiments in the future fusion reactor.Liquid metal blanket is one of the experimental blanket schemes.The study of liquid metal blanket has two main points:one is to reduce the additional pressure drop caused by the magnetohydrodynamic effect and the other is to improve the heat transfer efficiency of the experimental blanket.Experimental and theoretical studies show that the(Magnetohydrodynamic,MHD)pressure drop of the liquid metal MHD flow is related to the geometry of the pipeline section.Based on the innovative experimental results of S-Channel deformed ducts,the Southwest Institute of Physics of Nuclear Industry proposed a parallel wall concave(Square duct with Internal Concave,SIC)duct to reduce the MHD pressure drop.In this paper,the pressure drop of liquid metal in conducting square duct(S duct),parallel wall concave duct(SIC duct)and parallel wall convex duct(Square duct with Outward Convex,SOC)duct under the action of the uniform strong magnetic field is first studied.The velocity distribution and current distribution are numerically simulated.The results show that SIC duct under laminar flow can not effectively reduce the MHD pressure drop,SOC duct can reduce the MHD pressure drop to some extent when the conductivity is weak.Then,the MHD pressure drop and velocity distribution of the three pipes under the vertical magnetic field is numerically simulated.The results show that the peak value of velocity jet near the parallel layer of SOC duct decreases significantly at low conductivity(C=0.01)and high Reynolds number,but neither of them can reduce the MHD pressure drop.Under the conditions of different magnetic field directions,weak conductivity and high Reynolds number,the influence of geometric deformation on the dimensionless MHD pressure drop of SOC tube basically disappears..Finally,the numerical simulation of the rectangular duct with conductive triangular drainage convex strip(RDB duct)and standard rectangular duct(R duct)with the same size is carried out based on the physical research in the southwest of the nuclear industry.The results show that RDB duct can effectively reduce the velocity jet intensity near parallel layer under different magnetic field directions,and the pressure drop of RDB duct is 46%lower than that of R duct in the vertical direction of magnetic field.The results show that(C=0.01)SOC duct can reduce the pressure drop of MHD slightly,decrease the pressure drop of MHD by 5%compared with the square duct,and can effectively reduce the intensity of jet near the parallel layer when the conductivity is weak,and the pressure drop of the duct is 54%compared with that of the square duct under the same parameters.Under the strong magnetic field,the RDB duct can effectively reduce the MHD pressure drop,which is 49%lower than that of the normal rectangular duct.In the design of liquid metal experimental cladding,the geometric sensitivity of pipeline can be used to reduce MHD pressure drop.