D0I:10.13374/i.issnl001153.2008.07.04H 第30卷第7期 北京科技大学学报 Vol.30 No.7 2008年7月 Journal of University of Science and Technology Beijing Ju.2008 薄板坯连铸工艺因素对结晶器非稳定流场特征参数的 影响 沈丙振沈厚发 清华大学机械工程系先进成形制造教有部重点实验室，北京100084 摘要利用波高仪和粒子示踪法在1：1的水力学模型中研究了薄板坯连铸工艺参数对结晶器内非稳定流场特征参数的影 响·结果表明：流场特征参数随时间变化具有一定的周期性·随着拉坯速度增加，平均射流撞击位置下降，平均回流区中心深 度下降，平均波高增加：同时，撞击点、回流区中心深度和波高的变化范围增大，周期减小，结晶器内流动不稳定程度增大·随 着水口浸入深度增加，平均射流撞击位置下降，平均回流区中心深度下降，平均波高减小：同时，撞击点、回流区中心深度和波 高的变化范围减小，周期增加，流场不稳定程度减小·随着水口出口角度增加，平均射流撞击位置下降，平均回流区中心深度 下降，平均波高减小：对于较大的水口出口角，尽管结晶器内流场非稳定流动范围较大，但是流场的运动周期较大，液面波动 的非稳定程度却较小。 关键词薄板坯连铸：结晶器；水力学模拟：流场；液面波动 分类号TF777.7 Influence of process factors on the characteristic parameters of unstable fluid flow in a continuous thin slab casting mould SHEN Bingz hen,SHEN Houfa Key Laboratory the Ministry of Education of China for Advanced Materials Processing Technology.Department of Mechanical Engineering.Tsinghua University,Beijing 100084.China ABSTRACI Experiments of a real aspect water model were conducted to study the influence of process factors on the characteristic parameters of unstable fluid flow in a continuous thin slab casting mould by using a wave gauge and the particle trajectory visualization method.The results show that the characteristic parameters of fluid flow vary with a certain periodicity.With increasing casting speed.the average jet impinging position and the average circumfluence center descend and the average wave height increases:more- over,the variation ranges of the jet impinging position,the circumfluence center and the wave height increase,the variation period decreases and the fluid flow becomes more unsteady.With increasing immersion depth of the submerged entry nozzle(SEN),the av- erage jet impinging position and the average circumfluence center descend and the average wave height decreases:in addition.the variation ranges of the jet impinging position.the circumfluence center and the wave height decrease,the variation period increases and the turbulent flow becomes gradually calmness.With increasing SEN outlet angle downwards,the average jet impinging position and the average circumfluence center descend and the average wave height decreases:for a larger SEN outlet angel,even though the characteristic fluid flow moving range is larger.the variation period is greater and the level fluctuation becomes relatively stable. KEY WORDS continuous thin slab casting:mould:water modeling:fluid flow level fluctuation 薄板坯连铸拉速高，结晶器横断面尺寸小，流场 进流场稳定性与温度均匀性具有重要意义，然而， 与液面波动变化更剧烈，合理地选择工艺参数对促 以往的一些研究工作一般是基于结晶器内流场的平 收稿日期：2007-05-05修回日期：2007-06-23 基金项目：国家自然科学基金及宝钢“钢铁研究联合基金“资助项目(N。,50474088) 作者简介：沈丙振(l973-),男：助理研究员，博士，E-mail:shenbu00@mails-tsinghua-edu:cm薄板坯连铸工艺因素对结晶器非稳定流场特征参数的 影响 沈丙振 沈厚发 清华大学机械工程系先进成形制造教育部重点实验室‚北京100084 摘 要 利用波高仪和粒子示踪法在1∶1的水力学模型中研究了薄板坯连铸工艺参数对结晶器内非稳定流场特征参数的影 响．结果表明：流场特征参数随时间变化具有一定的周期性．随着拉坯速度增加‚平均射流撞击位置下降‚平均回流区中心深 度下降‚平均波高增加；同时‚撞击点、回流区中心深度和波高的变化范围增大‚周期减小‚结晶器内流动不稳定程度增大．随 着水口浸入深度增加‚平均射流撞击位置下降‚平均回流区中心深度下降‚平均波高减小；同时‚撞击点、回流区中心深度和波 高的变化范围减小‚周期增加‚流场不稳定程度减小．随着水口出口角度增加‚平均射流撞击位置下降‚平均回流区中心深度 下降‚平均波高减小；对于较大的水口出口角‚尽管结晶器内流场非稳定流动范围较大‚但是流场的运动周期较大‚液面波动 的非稳定程度却较小． 关键词 薄板坯连铸；结晶器；水力学模拟；流场；液面波动 分类号 TF777∙7 Influence of process factors on the characteristic parameters of unstable fluid flow in a continuous thin slab casting mould SHEN Bingz hen‚SHEN Houf a Key Laboratory the Ministry of Education of China for Advanced Materials Processing Technology‚Department of Mechanical Engineering‚Tsinghua University‚Beijing100084‚China ABSTRACT Experiments of a real aspect water model were conducted to study the influence of process factors on the characteristic parameters of unstable fluid flow in a continuous thin slab casting mould by using a wave gauge and the particle trajectory visualization method．T he results show that the characteristic parameters of fluid flow vary with a certain periodicity．With increasing casting speed‚the average jet impinging position and the average circumfluence center descend and the average wave height increases；more￾over‚the variation ranges of the jet impinging position‚the circumfluence center and the wave height increase‚the variation period decreases and the fluid flow becomes more unsteady．With increasing immersion depth of the submerged entry nozzle （SEN）‚the av￾erage jet impinging position and the average circumfluence center descend and the average wave height decreases；in addition‚the variation ranges of the jet impinging position‚the circumfluence center and the wave height decrease‚the variation period increases and the turbulent flow becomes gradually calmness．With increasing SEN outlet angle downwards‚the average jet impinging position and the average circumfluence center descend and the average wave height decreases；for a larger SEN outlet angel‚even though the characteristic fluid flow moving range is larger‚the variation period is greater and the level fluctuation becomes relatively stable． KEY WORDS continuous thin slab casting；mould；water modeling；fluid flow；level fluctuation 收稿日期：2007-05-05 修回日期：2007-06-23 基金项目：国家自然科学基金及宝钢“钢铁研究联合基金”资助项目（No．50474088） 作者简介：沈丙振（1973—）‚男‚助理研究员‚博士‚E-mail：shenbz00＠mails．tsinghua．edu．cn 薄板坯连铸拉速高‚结晶器横断面尺寸小‚流场 与液面波动变化更剧烈．合理地选择工艺参数对促 进流场稳定性与温度均匀性具有重要意义．然而‚ 以往的一些研究工作一般是基于结晶器内流场的平 第30卷 第7期 2008年 7月 北 京 科 技 大 学 学 报 Journal of University of Science and Technology Beijing Vol．30No．7 Jul．2008 DOI:10．13374／j．issn1001－053x．2008．07．041