水口侧孔倾角对大方坯结晶器流场和液面波动的影响

Effect of nozzle outlet angle on the fluid flow and level fluctuation in a bloom casting mould

基于湍流模型与多相流模型的耦合,实现了对结晶器流动与自由液面波动行为的计算模拟.分析研究了不同侧孔倾角对对称多侧孔水口浇注大方坯结晶器内流场及自由液面波动的影响规律.结果表明:水口侧孔向下角度每增加5°,结晶器宽面和窄面冲击点位置分别下降约13mm和10mm;一定浸入深度下,钢水出口向下倾角的大小对大方坯结晶器液面波动影响不大,在3mm以内;结晶器壁面附近的钢液较水口附近钢液活跃.推荐水口侧孔向下倾角为20°.

Based on the coupled model of turbulence and multiphase fluid flow, the flow behavior with free surface fluctuation in a bloom casting mould was numerically simulated. The influence of nozzle outlet angle on the fluid flow and free surface oscillation in the mould was analyzed. The results show that when the downward nozzle outlet angle increase by 5°, the impinging spots descend by 13 mm and 10 mm at the wide faces and narrow faces respectively. At a given submergence depth of 100 mm, outlet angle show limited influence on the fluctuation within 3 mm. The fluid close to mould wall is more active than that close to nozzle. The nozzle outlet angle of 20° is recommended to use.