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The effect of magnetic field on the continuous steel casting process

磁场对连铸钢过程的影响

基本信息

批准号：
10555259
负责人：
OZOE Hiroyuki
金额：
$ 6.46万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555259/
关键词：
Steel continuous casting magnetic field numerical analysis 鉄鋼連鋳カスプ磁場異形磁場

项目摘要

This is the final year of the research and research results are summarized for four years. Magnetic field is applied to the continuous steel casting process to solidify the molten steel safely. In this work, the convection of molten steel was modeled by the equation of continuity, momentum equations in the x-, y-, and z-directions and energy equation. Further more Ohm's law, conservation of electricity and Bio-Savart's law were considered.The system is composed of a rectangular box of ?x?lx2? and O.1?lx0.1? nozzle is extended into the molten steel up to 0.5?.Molten steel is blown out through the bottom of a nozzle. Four surrounding side walls are cooled isothermally and top and bottom plane is thermally insulated. Three cases of magnetic field were considered, i. e., one coil around a rectangular enclosure, two coils at the end of x-direction and two coils at the end of y-direction. Model equations were approximated by finite difference equations and solved by a HSMAC scheme. Computational region was divided into 50^3 meshes with nonuniform staggered meshes. Numerical conditions are Re= 10^4, Re_<in> = 10^3, Gr=10^7, Pr=0.025 and Ha=0, 100, 200 and 500.When there is no magnetic field, the jet fluid from nozzles hit the solidifying side walls and constitute four rolls. In the case of one electric coil, large roll cells were constituted at Ha = 100 and 200 but they were decreased at Ha = 500. In the case of x-directional two coils, at Ha = 100 and 200 the convection cells were similar to that at Ha = 0 but at Ha= 500, roll cells were limited to the upper part and the jet flow from nozzles did not reach the side walls. In the case of y-directional two coils, even at Ha = 500, jet flow from nozzle remained and reached to the side walls.From these results, a coil around an enclosure appears to be best and the x-directional two coils system is the next. However, continuous steel casting process includes many factors other than this and further study is required.

这是研究的最后一年，对四年来的研究成果进行了总结。将磁场应用于连铸过程中，使钢液安全凝固。本文采用连续性方程、x、y、z方向动量方程和能量方程来模拟钢液的对流。进一步考虑了欧姆定律、电守恒定律和比奥-萨瓦特定律。该系统由一个× × × × × × × ×的矩形盒子组成。和O.1 lx0.1 ?喷嘴伸入钢液达0.5°。钢水从喷嘴的底部喷出。四周的四个侧壁是等温冷却的，上下平面是绝热的。考虑了三种情况下的磁场，即一个线圈围绕一个矩形外壳，两个线圈在x方向的末端和两个线圈在y方向的末端。模型方程用有限差分方程逼近，用HSMAC格式求解。计算区域被划分为50^3个网格，网格不均匀交错分布。数值条件为Re= 10^4, Re_<in> =10^ 3, Gr=10^7, Pr=0.025, Ha= 0,100,200和500。当无磁场时，喷嘴喷出的射流击中凝固侧壁，形成四卷。以一个线圈为例，在Ha = 100和200时构成了大的卷芯，但在Ha = 500时减少了。在x向双线圈的情况下，在Ha= 100和200时对流单元与Ha= 0时相似，但在Ha= 500时，滚流单元被限制在上部，喷嘴的射流没有到达侧壁。在y向双线圈的情况下，即使在Ha = 500时，喷嘴的射流仍然存在并到达侧壁。从这些结果来看，围绕外壳的线圈似乎是最好的，x方向的两个线圈系统是下一个。然而，连铸过程中还包括许多其他因素，需要进一步研究。