圆坯结晶器偏心浇注条件下水口优化的模拟研究
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摘要
针对连铸生产过程中常出现水口不对中的问题,通过旋流水口来消除偏心水口带来的不利影响。建立了圆坯结晶器内三维流动、传热数学模型,结合水模型实验,计算分析了水口优化前后结晶器内的流场和温度场。结果表明:合适的水口切向倾角可以使钢液产生较强的旋流,降低偏心浇注条件下结晶器内的偏流指数。旋流流场还可以减小钢液的冲击深度,促进钢液过热耗散,使热中心上移,均匀初生坯壳厚度,提高铸坯品质。
For the problems of nozzle eccentric in continuous casting, the swirling flow nozzle was used to eliminate the adverse effects of eccentric nozzle. A three dimension mathematical model was built for fluid flow and heat transfer in the round bloom continuous casting mould. The flow and temperature field were computed under prototype nozzle and the new type nozzle conditions. The results show that a strong horizontal swirling flow is observed with a proper nozzle angles, the drift index and impact depth of liquid steel can be declined. The swirling flow also be beneficial to dissipation of steel supper heat and the cross-section solidified shell distributes uniformly in the mould.
For the problems of nozzle eccentric in continuous casting, the swirling flow nozzle was used to eliminate the adverse effects of eccentric nozzle. A three dimension mathematical model was built for fluid flow and heat transfer in the round bloom continuous casting mould. The flow and temperature field were computed under prototype nozzle and the new type nozzle conditions. The results show that a strong horizontal swirling flow is observed with a proper nozzle angles, the drift index and impact depth of liquid steel can be declined. The swirling flow also be beneficial to dissipation of steel supper heat and the cross-section solidified shell distributes uniformly in the mould.
引文
[1]杨秉俭,蔡临宁,苏俊义.连铸结晶器中三维紊流场的等效模型[J].西安交通大学学报,1996,30(4):79-85.
[2]Huang X,Thomas BG,Najjar FM.Modeling superheat removal during continuous casting of steel slabs[J].Metall Mater Trans B,1992,13(23):339-356.
[3]Bai H,Thomas BG.Turbulent flow of liquid steel and argon bubbles in slide-gate tundish nozzles:Part 1.Model development and validation[J].Metall Mater Trans B,2001,32(2):253-267.
[4]Tsukaguchi Y,Nakamura O,Jonsson P,et al.Design of swirling flow submerged entry nozzles for optimal head consumption between tundish and mould[J].ISIJ International,2007,47(10):1436-1443.
[5]Yokoya S,Takagi S,Iguchi M,et al.Swirling effect in immersion nozzle on flow and heat transport in billet continuous casting mould[J].ISIJ International,1998,38(8):827-833.
[6]王维维,张家泉,陈素琼,等.水口侧孔倾角对大方坯结晶器流场和液面波动的影响[J].北京科技大学学报,2007,29(8):816-821.
[7]吴炳胜,傅彦棉,田倩影,等.新型水口作用下的结晶器流场数值模拟[J].铸造技术,2015,36(03):763-766.
[8]Chattopadhyay K,Isac M,Guthrie RIL.Physical and mathematical modelling of steelmaking tundish operations:A review of the last decade(1999-2009)[J].ISIJ International,2010,50(3):331-348.
[9]靳星.板坯连铸结晶器内钢液流动行为与模拟方法研究[D].重庆:重庆大学,2011.
[2]Huang X,Thomas BG,Najjar FM.Modeling superheat removal during continuous casting of steel slabs[J].Metall Mater Trans B,1992,13(23):339-356.
[3]Bai H,Thomas BG.Turbulent flow of liquid steel and argon bubbles in slide-gate tundish nozzles:Part 1.Model development and validation[J].Metall Mater Trans B,2001,32(2):253-267.
[4]Tsukaguchi Y,Nakamura O,Jonsson P,et al.Design of swirling flow submerged entry nozzles for optimal head consumption between tundish and mould[J].ISIJ International,2007,47(10):1436-1443.
[5]Yokoya S,Takagi S,Iguchi M,et al.Swirling effect in immersion nozzle on flow and heat transport in billet continuous casting mould[J].ISIJ International,1998,38(8):827-833.
[6]王维维,张家泉,陈素琼,等.水口侧孔倾角对大方坯结晶器流场和液面波动的影响[J].北京科技大学学报,2007,29(8):816-821.
[7]吴炳胜,傅彦棉,田倩影,等.新型水口作用下的结晶器流场数值模拟[J].铸造技术,2015,36(03):763-766.
[8]Chattopadhyay K,Isac M,Guthrie RIL.Physical and mathematical modelling of steelmaking tundish operations:A review of the last decade(1999-2009)[J].ISIJ International,2010,50(3):331-348.
[9]靳星.板坯连铸结晶器内钢液流动行为与模拟方法研究[D].重庆:重庆大学,2011.
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