行波磁场对板坯连铸结晶器内钢水流态的影响
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摘要
针对板坯连铸过程中,结晶器内钢水在行波磁场(电磁搅拌)作用下的流动行为,采用水银作为模拟工质进行模型实验,并结合基于流场雷诺应力模型的数值模拟,分析钢水的流动规律及其对连铸工艺的影响.研究结果显示,施加行波磁场(电磁搅拌)时,结晶器内钢水注流的对称性发生了改变,进流被电磁力推向一侧,在结晶器内形成全区域的水平环流,破坏了通常钢水注流所呈现的规律性上下环流;在结晶器上部近液面区域内,水口两侧的环流分别被压缩到靠近水口或窄面的位置,从而使结晶器内流场趋于紊乱的三维流态;同时,液面波动幅度增大,在钢水注流与电磁力反向的一侧,液面波动更加剧烈.
This paper presents a mercury model experiment and coupling numerical simulation with Reynolds time-average model on molten metal flow in the mold of continuous casting of slab. The purpose is to study the influence of a traveling magnetic field(electromagnetic stirring) on the metal flow in the mold. The result shows that, in the mold,the stirring force from the traveling electromagnetic field makes the molten metal form a horizontal circumfluence, leading to destroy of the originally regular circumfluence. In the whole mold, the flow is three dimensional and non-symmetrical. Furthermore, the traveling magnetic field strengthens fluctuation of meniscus. The fluctuation is stronger on the side where the nozzle flow is opposite to the electromagnetic force.
This paper presents a mercury model experiment and coupling numerical simulation with Reynolds time-average model on molten metal flow in the mold of continuous casting of slab. The purpose is to study the influence of a traveling magnetic field(electromagnetic stirring) on the metal flow in the mold. The result shows that, in the mold,the stirring force from the traveling electromagnetic field makes the molten metal form a horizontal circumfluence, leading to destroy of the originally regular circumfluence. In the whole mold, the flow is three dimensional and non-symmetrical. Furthermore, the traveling magnetic field strengthens fluctuation of meniscus. The fluctuation is stronger on the side where the nozzle flow is opposite to the electromagnetic force.
引文
[1]毛斌,陶金明,李晋,等.板坯连铸结晶器电磁控制流动技术[J].连铸,2006(6):32-37.
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[5]于湛,张振强,任忠鸣,等.板坯电磁制动结晶器内流体流动的研究[J].金属学报,2010,46(10):1275-1280.
[6]于湛,周月明,任忠鸣.磁感应强度对高速流动控制结晶器内金属液流动的影响[J].上海金属,2011,33(6):36-40.
[7]王寅,张振强,于湛,等.射流型磁场排布方式控制结晶器内液流的实验研究[J].金属学报,2011,47(10):1285-1291.
[8]王敏,贾皓,张振强,等.电磁制动下板坯结晶器内金属流动的物理模拟[J].上海金属,2011,33(6):41-45.
[9]于湛,雷作胜,贾洪海,等.液态金属流速的测量技术[J].上海金属,2007,29(2):54-58.
[10]Jia H,Zhang Z Q,Chang T X.Study on flow in mold with EMBr in slab continuous casting[J].J Iron Steel Res Int,2012,19(S1):1001-1005.
[11]Zhang X W,Jin X L,Wang Y.Comparison of standard k-εmodel and RSM on three dimensional turbulent flow in the SEN of slab continuous caster controlled by slide gate[J].ISIJ Int,2011,51(4):581-587.
[2]李宝宽,邓康.钢连铸电磁搅拌技术的理论分析[C]//特钢连铸技术研讨会论文集.2007:120-125.
[3]Fujisaki K.In-mold electromagnetic stirring in continuous casting[J].IEEE Trans Indus Appl,2001,37(4):1098-1104.
[4]Takatani K.Effects of electromagnetic brake and meniscus electromagnetic stirrer on transient molten seel flow at meniscus in a continuous casting mold[J].ISIJ Int,2003,43(6):915-922.
[5]于湛,张振强,任忠鸣,等.板坯电磁制动结晶器内流体流动的研究[J].金属学报,2010,46(10):1275-1280.
[6]于湛,周月明,任忠鸣.磁感应强度对高速流动控制结晶器内金属液流动的影响[J].上海金属,2011,33(6):36-40.
[7]王寅,张振强,于湛,等.射流型磁场排布方式控制结晶器内液流的实验研究[J].金属学报,2011,47(10):1285-1291.
[8]王敏,贾皓,张振强,等.电磁制动下板坯结晶器内金属流动的物理模拟[J].上海金属,2011,33(6):41-45.
[9]于湛,雷作胜,贾洪海,等.液态金属流速的测量技术[J].上海金属,2007,29(2):54-58.
[10]Jia H,Zhang Z Q,Chang T X.Study on flow in mold with EMBr in slab continuous casting[J].J Iron Steel Res Int,2012,19(S1):1001-1005.
[11]Zhang X W,Jin X L,Wang Y.Comparison of standard k-εmodel and RSM on three dimensional turbulent flow in the SEN of slab continuous caster controlled by slide gate[J].ISIJ Int,2011,51(4):581-587.