摘要
采用大涡模拟方法对结晶器内钢液涡流现象进行模拟,研究了水口插入深度、出流角度等与“湍动涡”在液面停留时间的关系,分析了“湍动涡”和“偏流涡”的形成机理,提出了消除“湍动涡”的平板式涡阻止器结构,对涡阻止器作用下“湍动涡”和“偏流涡”的运动规律进行模拟,数值模拟结果表明:“湍动涡”是由于流体本身的脉动所形成的,随着水口出流角度的增大及水口插入深度的增加,“湍动涡”在液面的停留时间延长;“偏流涡”是由于水口不对中导致的液面的不对称流动以及流体本身的脉动综合作用形成的,平板式涡阻止器能有效消除“湍动涡”,并对“偏流涡”有一定的减弱作用。
Large eddy simulation of vortexing flow of molten steel in the continuous casting mold was conducted. The influence of the SEN (submerged entry nozzle) port angle and the SEN position to the turbulent vortex was analyzed. The mechanism of the turbulent vortex and the biased vortex was analyzed. A new vortex brake was designed to eliminate the vortexing flow, and the fluid flow with and without the vortex brake was simulated. The simulation results show that the turbulent vortex is caused by the turbulent energy; Increase of the SEN port angle and the depth of the SEN below the surface increases the residence time of the turbulent vortex in the free surface. The biased vortex is caused by the off-center of SEN and the turbulent energy. The new vortex brake can eliminate the turbulent vortex and decrease the strength of the 'biased vortex'.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期88-93,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金50176022
关键词
连铸结晶器
涡流
大涡模拟
钢液
continuous casting mold
vortexing flow
large eddy simulation
molten steel
