板坯连铸二冷区电磁搅拌的数值模拟
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摘要
利用ANSYS和CFX商业软件,对国内304不锈钢板坯连铸二冷区电磁搅拌进行了数值模拟研究。结果表明,随着频率的增加,磁感应强度减小、电磁力增大;随着电流的增加,磁感应强度、电磁力均增大,且磁感应强度、电磁力的最大值均出现在板坯中心点;电流为400 A时,频率每增加1 Hz,板坯中心点磁感应强度减少约1.68 mT;频率为5 Hz时,电流每增加100 A,板坯中心点磁感应强度增加约7.68 mT;板坯纵轴线上电磁力出现两个呈现对称分布的峰,且宽面中心截面出现两个对称分布的漩涡流场;随着频率和电流的增加,板坯中心点搅拌速度线性增大;电流为400 A时,频率每增加1 Hz,板坯中心点钢液流速增加约0.02 m·s~(-1),频率为5 Hz时,电流每增加100 A,钢液流速增加约0.084 m·s~(-1)。
The effect of the second cooling segment with electromagnetic stirring(S-EMS) on the continuous casting 304 stainless steel slab was investigated by commercial software of ANSYS and CFX. The result shows that magnetic induction decreases and electromagnetic force increases with the increasing current frequency. Both magnetic induction and electromagnetic force increases with the increasing current intensity,and their maximum values appear at the center of slab. When the current intensity is 400 A,magnetic induction at the center of slab decreases by about 1.68 mT for every 1Hz increase and,when the current frequency is 5 Hz,magnetic induction at the center of slab increases by about 7.68 mT for every 100 A increase. Electromagnetic force at the longitudinal direction of the slab has two symmetrical peaks,and center section on broad face of the slab has two symmetrical flow fields. Flow velocity of molten steel at the center of slab increases linearly with the increasing current frequency and intensity. When the current intensity is 400 A,flow velocity of molten steel at the center of slab increases by about 0.02 m·s~(-1)for every 1 Hz increase and,when the current frequency is 5 Hz,flow velocity of molten steel at the center of slab increases by about 0.084 m·s~(-1)for every 100 A increase.
The effect of the second cooling segment with electromagnetic stirring(S-EMS) on the continuous casting 304 stainless steel slab was investigated by commercial software of ANSYS and CFX. The result shows that magnetic induction decreases and electromagnetic force increases with the increasing current frequency. Both magnetic induction and electromagnetic force increases with the increasing current intensity,and their maximum values appear at the center of slab. When the current intensity is 400 A,magnetic induction at the center of slab decreases by about 1.68 mT for every 1Hz increase and,when the current frequency is 5 Hz,magnetic induction at the center of slab increases by about 7.68 mT for every 100 A increase. Electromagnetic force at the longitudinal direction of the slab has two symmetrical peaks,and center section on broad face of the slab has two symmetrical flow fields. Flow velocity of molten steel at the center of slab increases linearly with the increasing current frequency and intensity. When the current intensity is 400 A,flow velocity of molten steel at the center of slab increases by about 0.02 m·s~(-1)for every 1 Hz increase and,when the current frequency is 5 Hz,flow velocity of molten steel at the center of slab increases by about 0.084 m·s~(-1)for every 100 A increase.
引文
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[5]姜东滨,王卫领,罗森,等.板坯连铸二冷区电磁搅拌过程数值模拟研究[C]//中国钢铁年会.北京:中国金属学会,2013:1-5.
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[2]刘洋,王新华.二冷区电磁搅拌对连铸板坯中心偏析的影响[J].北京科技大学学报,2007,29(6):582-585,590.
[3]LIU C T.Refined model development and performance assessment of a linear induction-type electromagnetic stirrer[J].IEEE Transactions on Magnetics,2010,46(10):3724-3730.
[4]易兵,李爱武.辊式电磁搅拌器在板坯连铸二冷区上的应用[C]//全国炼钢-连铸生产技术会.唐山:中国金属学会,2014:512-519.
[5]姜东滨,王卫领,罗森,等.板坯连铸二冷区电磁搅拌过程数值模拟研究[C]//中国钢铁年会.北京:中国金属学会,2013:1-5.
[6]易军.基于旋转磁场、行波磁场电磁搅拌器的数值模拟[D].包头:内蒙古科技大学,2014.
[7]李建超,尹永昌,王宝峰.连铸板坯二冷区辊式电磁搅拌器搅拌方式模拟[J].特种铸造及有色合金,2013,33(4):302-305.
[8]SZEKELY J.Fluid flow phenomena in metals processing[M].New York:Academic Press,1979:175-203.
[9]雷洪.结晶器冶金学[M].北京:冶金工业出版社,2011:8-25.