板坯连铸结晶器数值模拟

运用Fluent 6.3对板坯连铸结晶器进行数值计算,研究拉速、水口浸入深度及水口开口角度对流场的影响.结果表明:对于断面1400 mm×230 mm结晶器,随拉速增加,液面最大水平和垂直流速均增加,而窄边冲击点的位置基本不变,随距液面距离增加,窄边速度先增加后减小,直至趋向于零;当拉速超过1.2 m.min-1时,液面水平速度增加明显.随水口浸入深度增加,液面最大水平流速减小,浸入深度超过140 mm时,最大水平流速变化不明显;垂直于液面方向的最大速度逐渐增加;对窄边冲击点影响较小.随水口开口向下角度增加,液面最大水平流速减小后增加,水口开口向下12.5°时液面最大水平流速最小,而水口开口向下10°～12.5°时窄边冲击点速度最小.

Numerical simulation on a slab continuous casting mould

A continuous casting mould with a cross section of 1 400 mm×230 mm was simulated by software Fluent 6.3,and the effects of casting speed,immersion depth and submerged nozzle(SEN) opening-angle on its flow field were investigated.It is shown that with the increase of casting speed,the maximum horizontal and vertical velocities of the liquid surface increase,and the position of the impact point on the narrow side does not change.With the increase of distance to the liquid surface,the velocity of the narrow side first increases and then decreases,till near to zero.When the casting speed is greater than 1.2 m·min-1,the horizontal velocity of the liquid surface obviously increase.With the increase of SEN immersion depth,the maximum horizontal velocity of the liquid surface decreases,and the maximum vertical velocity increases.SEN immersion depth has little effect on the impact point on the narrow side.When the SEN immersion depth is greater than 140 mm,the change of the maximum horizontal velocity is small.With the increase of SEN downward opening-angle,the maximum horizontal velocity of the liquid surface first decreases and then increases.When the SEN downward opening-angle is 12.5°,the maximum horizontal velocity of the liquid surface is the smallest,but the minimum velocity at the impact point on the narrow side can be obtained when the SEN downward opening-angle is 10° to 12.5°.