镁合金电磁铸造结晶器内磁场分布的数值模拟研究
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摘要
采用数值模拟的方法,对电磁搅拌下镁合金半连续铸造结晶器中径向磁感应强度分布进行了仿真计算。考察了结晶器铜套厚度、电流强度、频率对磁感应强度和磁场分布状态的影响,提出了径向磁场分布评价指标和方法(径向磁场均匀性系数η),探讨了磁场均匀性系数的计算方法和物理意义,给出了电磁搅拌参数优化选择的依据。
A two-dimensional mathematical model was established in present. It was used to calculate the radial direction magnetic flux density in the mold of magnesium alloy semi-continuous casting under electromagnetic stirring. The number and distribution characteristics of magnetic flux density under different mold thickness,number of electric current and current frequency were studied. Based on the calculation results,the evaluation method and index of radial direction magnetic field( the homogeneity coefficient of radial direction magnetic field) were proposed. The calculation method and physical significance of the coefficient were introduced,and the optimization method of electromagnetic stirring parameters was suggested.
A two-dimensional mathematical model was established in present. It was used to calculate the radial direction magnetic flux density in the mold of magnesium alloy semi-continuous casting under electromagnetic stirring. The number and distribution characteristics of magnetic flux density under different mold thickness,number of electric current and current frequency were studied. Based on the calculation results,the evaluation method and index of radial direction magnetic field( the homogeneity coefficient of radial direction magnetic field) were proposed. The calculation method and physical significance of the coefficient were introduced,and the optimization method of electromagnetic stirring parameters was suggested.
引文
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[3]黄西平,张琦,郭淑元,等.我国镁资源利用现状及开发前景[J].海湖盐与化工,2004,33(6):1-6.
[4]李金柱,农登,郑开宏,等.镁合金半连续铸造技术的研究与展望[J].铸造技术,2013,34(3):334-337.
[5]Turewicz P,Baake E,Umbrashko A.Numerical simulation of electromagnetic stirring in continuous casting of wires[J].COMPEL,2011,305:1499-1506.
[6]詹美燕,李元元,陈维平.电磁搅拌铸造及其在镁合金上的应用[J].轻合金加工技术,2007,35(8):6-10.
[7]Trindade,LB,Vilela ACF.Numerical model of electromagnetic stirring for continuous casting billets[J].IEEE Transactions on Magnetic,2002,38(6):3658.
[8]赵凯阳.半连续镁合金锭铸态组织研究[D].重庆:重庆大学,2010.
[9]张志强,乐启炽,崔建忠.电磁场施加方式对半连续铸造镁合金锭坯组织与性能的影响[J].稀有金属材料与工程,2009,38(8):1467-1471.
[10]Eliezer D,Aghion E,Froes F H.Magnesium science,technology and applications[J].Advanced Performance Materials,1998,5(3):201-212.
[11]张三慧.电磁学[M].北京:清华大学出版社,1999:369-373.
[12]蔡少武.钢坯连铸结晶器铜管结构模拟优化设计[D].大连:大连理工大学,2010.
[13]张静,王恩刚,邓安元,等.大方坯结晶器电磁搅拌参数对磁场分布的影响[J].中国冶金,2011,21(1):15-19.