板坯二冷区电磁搅拌辊布置方式
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摘要
二冷区电磁搅拌是提高铸坯质量的一个有效办法。利用ANSYS和CFX软件,在电流为400 A、频率为5 Hz情况下,对连铸坯二冷区电磁搅拌进行数值模拟,分析了双蝶、双环和三环3种搅拌模式下连铸机内电磁场和钢液流场特点。结果表明,在双蝶、双环和三环3种搅拌模式下,电磁搅拌辊附近横截面的磁感应强度分布相似,而双环式电磁力大小约为双蝶式和三环式的2倍;双蝶、双环和三环3种搅拌模式在铸坯中心纵截面上的流场皆关于铸坯中心横截面对称,且双环形成的回流区较大。
S-EMS(Strand Electromagnetic Stirring)installed in secondary cooling zone of slab continuous casting machine is an effective way to improve the quality of the cast slab. By using ANSYS CFX software,numerical simulations were performed to analyze the electromagnetic field and flow field in the secondary cooling zone of the slab caster for three stirring modes(i.e.,ambi-butterfly,two-ringlike and three-ringlike)induced by S-EMS under the condition of 400 A current and 5 Hz frequency. Numerical results show that the magnetic induction intensity distributions at the horizontal cross section near the electromagnetic stirring roller for the three stirring modes are similar to one another,and the electromagnetic force for the case of the tworinglike mode is about twice of those in the rest of the stirring modes. The fluid flow patterns at the central longitudinal cross section are symmetrical in all three stirring modes,and the recirculation zone of induced by the two-ringlike stirring mode is the largest as compared with two other stirring modes.
S-EMS(Strand Electromagnetic Stirring)installed in secondary cooling zone of slab continuous casting machine is an effective way to improve the quality of the cast slab. By using ANSYS CFX software,numerical simulations were performed to analyze the electromagnetic field and flow field in the secondary cooling zone of the slab caster for three stirring modes(i.e.,ambi-butterfly,two-ringlike and three-ringlike)induced by S-EMS under the condition of 400 A current and 5 Hz frequency. Numerical results show that the magnetic induction intensity distributions at the horizontal cross section near the electromagnetic stirring roller for the three stirring modes are similar to one another,and the electromagnetic force for the case of the tworinglike mode is about twice of those in the rest of the stirring modes. The fluid flow patterns at the central longitudinal cross section are symmetrical in all three stirring modes,and the recirculation zone of induced by the two-ringlike stirring mode is the largest as compared with two other stirring modes.
引文
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[11]聂欣,张玉洲,张童伟.6种低雷诺数k-ε模型在三维附壁剪切流中的数值模拟与对比分析[J].中国电机工程学报,2017,37(24):7247-7254.
[2]韩志成.电磁冶金[M].北京:冶金工业出版社,2001:5-12.
[3]王晓东,李廷举,金俊泽.时谐电磁场均衡性研究[J].大连理工大学学报,2002,42(1):75-78.
[4]LEONARDO B T,ANOTONIO C F. Numerical model of electromagnetic stirring for continuous casting billets[J]. IEEE Transactions on Magnetic,2002,38(6):3658-3660.
[5]吴扣根.圆坯连铸结晶器电磁搅拌过程数学模拟与实验研究[D].上海:上海大学,2001.
[6]丁贺.辊式二冷区电磁搅拌对板坯质量影响研究[D].昆明:昆明理工大学,2016.
[7]宿国栋.板坯连铸二冷区电磁搅拌耦合分析[D].包头:内蒙古科技大学,2007.
[8]陈士富,王猛,牛宏等.二冷区辊式电磁搅拌的模拟研究[J].辽宁科技大学学报,2017,40(5):337-342,349.
[9]雷洪.结晶器冶金学[M].北京:冶金工业出版社,2011:154-180.
[10]胡显词.Maxwell电磁场方程组[J].零陵师专学报,1994(S1):84-92.
[11]聂欣,张玉洲,张童伟.6种低雷诺数k-ε模型在三维附壁剪切流中的数值模拟与对比分析[J].中国电机工程学报,2017,37(24):7247-7254.