Numerical and experimental investigation results on the magnetohydrodynamics（MHD） film flows along flat and curved bottom surfaces are summarized in this study. A simplified modeling has been developed to study the ...Numerical and experimental investigation results on the magnetohydrodynamics（MHD） film flows along flat and curved bottom surfaces are summarized in this study. A simplified modeling has been developed to study the liquid metal MHD film state, which has been validated by the existing experimental results. Numerical results on how the inlet velocity（V）, the chute width（W） and the inlet film thickness（d0） affect the MHD film flow state are obtained. MHD stability analysis results are also provided in this study. The results show that strong magnetic fields make the stable V decrease several times compared to the case with no magnetic field,especially small radial magnetic fields（Bn） will have a significant impact on the MHD film flow state. Based on the above numerical and MHD stability analysis results flow control methods are proposed for flat and curved MHD film flows. For curved film flow we firstly proposed a new multi-layers MHD film flow system with a solid metal mesh to get the stable MHD film flows along the curved bottom surface. Experiments on flat and curved MHD film flows are also carried out and some firstly observed results are achieved.展开更多
本文以车用空调用电磁线圈罩体零件为研究对象,通过采用Deform-3D锻压有限元模拟分析软件与试验相结合的方法,研究了罩体类零件冲压冷锻成形工艺(Flow Control Forming of Sheet Metal)过程中金属流动规律,为优化模具结构和工艺参数提...本文以车用空调用电磁线圈罩体零件为研究对象,通过采用Deform-3D锻压有限元模拟分析软件与试验相结合的方法,研究了罩体类零件冲压冷锻成形工艺(Flow Control Forming of Sheet Metal)过程中金属流动规律,为优化模具结构和工艺参数提供了理论依据。研究结果表明:该模拟分析能够很好的指导生产实践。展开更多
基金supported by the National Magnetic Confinement Fusion Science Program of China(Nos.2014GB125003 and 2013GB114002)National Natural Science Foundation of China(No.11105044)
文摘Numerical and experimental investigation results on the magnetohydrodynamics（MHD） film flows along flat and curved bottom surfaces are summarized in this study. A simplified modeling has been developed to study the liquid metal MHD film state, which has been validated by the existing experimental results. Numerical results on how the inlet velocity（V）, the chute width（W） and the inlet film thickness（d0） affect the MHD film flow state are obtained. MHD stability analysis results are also provided in this study. The results show that strong magnetic fields make the stable V decrease several times compared to the case with no magnetic field,especially small radial magnetic fields（Bn） will have a significant impact on the MHD film flow state. Based on the above numerical and MHD stability analysis results flow control methods are proposed for flat and curved MHD film flows. For curved film flow we firstly proposed a new multi-layers MHD film flow system with a solid metal mesh to get the stable MHD film flows along the curved bottom surface. Experiments on flat and curved MHD film flows are also carried out and some firstly observed results are achieved.
文摘本文以车用空调用电磁线圈罩体零件为研究对象,通过采用Deform-3D锻压有限元模拟分析软件与试验相结合的方法,研究了罩体类零件冲压冷锻成形工艺(Flow Control Forming of Sheet Metal)过程中金属流动规律,为优化模具结构和工艺参数提供了理论依据。研究结果表明:该模拟分析能够很好的指导生产实践。
