摘要
为优化连铸圆坯结晶器内流场,改善铸坯表面与内部质量,本文基于分孔旋流水口技术,通过几何比为1.625∶1的水模型试验系统,研究了φ650mm圆坯结晶器在不同侧孔数量、不同拉坯速度以及有/无结晶器电磁搅拌(Mold Electromagnetic Stirrer,M-EMS)条件下的流场特性与液面波动行为,并与传统直筒水口进行对比。结果表明,分孔旋流水口可显著减小钢液冲击深度,促进低过热度浇注,有利于凝固组织细化。增加侧孔数量可减弱水口出流形成的下返流强度,抑制其在结晶器中心形成的“倒三角”流动结构,从而延缓溶质元素向心部的迁移,减轻中心偏析。此外,分孔旋流水口能够保持流场在纵截面上的对称分布,避免单独使用M-EMS时可能出现的偏流现象。在与M-EMS联合使用时,形成的复合旋流可有效稳定液面,将波动幅度由单独搅拌时的±3.0mm控制在±1.5mm以内。本研究为分孔旋流水口技术在提升连铸圆坯质量方面的应用提供了实验支撑。
To optimize the flow field inside the mold during continuous casting of round billets and enhance both surface and internal quality of the cast product,this paper investigates the multi-hole swirling flow nozzle technology.Experiments were conducted using a water model with a geometric scale ratio of 1∶1.625 to examine the flow behavior and meniscus fluctuations in aø650 mm round billet mold under various conditions,including different numbers of side holes,different casting speeds,and with/without mold electromagnetic stirring(M-EMS).Comparisons were made with a conventional straight nozzle.The results indicate that the multi-hole swirling nozzle significantly reduces the impact depth of molten steel,facilitates low-superheat casting,and contributes to the refinement of the solidification structure.Increasing the number of side holes weakens the downward backflow generated by the nozzle discharge and suppresses the characteristic“inverted triangle”flow pattern at the center of the mold,thereby delaying the transport of solute elements to the central region and reducing centerline segregation.Furthermore,the multi-hole swirling nozzle helps maintain a symmetrical flow field distribution along the longitudinal section,preventing flow bias that may occur when M-EMS is used alone.When combined with M-EMS,the coupled swirling flow effectively stabilizes the meniscus,reducing the fluctuation amplitude from±3.0 mm with M-EMS alone to within±1.5 mm.This study provides experimental evidence supporting the application of multi-hole swirling flow nozzle technology in improving the quality of continuous cast round billets.
作者
吴春雷
王连钰
郭晓影
孙延文
史纯阳
WU Chunlei;WANG Lianyu;GUO Xiaoying;SUN Yanwen;SHI Chunyang(School of Metallurgy and Materials Engineering,Liaoning Institute of Science and Technology,Benxi 117004,Liaoning,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),Northeastern University,Shenyang 110819,Liaoning,China;School of Electrical and Automation Engineering,Liaoning Institute of Science and Technology,Benxi 117004,Liaoning,China)
出处
《连铸》
北大核心
2025年第5期47-55,共9页
Continuous Casting
基金
辽宁省教育厅基本科研资助项目(LJ222411430033)
辽宁省自然科学基金资助项目(2024-BS-219)
辽宁科技学院博士科研启动基金资助项目(2407B09,2505B05,2505B07)。
关键词
连铸
流场
旋流水口
电磁搅拌:水模型试验
continuous casting
flow field
swirling flow nozzle
electromagnetic stirring
water model experiment
