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利用波高仪和粒子示踪法在1∶1的水力学模型中研究了薄板坯连铸工艺参数对结晶器内非稳定流场特征参数的影响.结果表明:流场特征参数随时间变化具有一定的周期性.随着拉坯速度增加,平均射流撞击位置下降,平均回流区中心深度下降,平均波高增加;同时,撞击点、回流区中心深度和波高的变化范围增大,周期减小,结晶器内流动不稳定程度增大.随着水口浸入深度增加,平均射流撞击位置下降,平均回流区中心深度下降,平均波高减小;同时,撞击点、回流区中心深度和波高的变化范围减小,周期增加,流场不稳定程度减小.随着水口出口角度增加,平均射流撞击位置下降,平均回流区中心深度下降,平均波高减小;对于较大的水口出口角,尽管结晶器内流场非稳定流动范围较大,但是流场的运动周期较大,液面波动的非稳定程度却较小.
The effect of thin slab continuous casting process parameters on the characteristic parameters of the unsteady flow field in the mold was studied by using the wave height meter and the particle tracing method in the 1: 1 hydraulic model. The results show that the characteristic parameters of the flow field have a certain change with time With the increase of billet velocity, the mean jet impact position decreased, the mean recirculation zone center depth decreased and the average wave height increased. At the same time, the range of variation of central depth and wave height of impact point and recirculation zone increased, the period decreased, and the crystallization The instability of the flow in the reactor increases.With the increase of the immersion depth of the nozzle, the average jet impact position decreases, the mean recirculation zone center depth decreases and the average wave height decreases. At the same time, the impact point, recirculation zone center depth and wave height change range decreases , The period increases and the instability of the flow field decreases.With the increase of outlet angle, the average impact position of jet decreases, the average depth of center of recirculation zone decreases, and the average wave height decreases. For the outlet angle of larger outlet, The range of field unsteady flow is larger, but the movement cycle of flow field is larger, and the instability of liquid level fluctuation is smaller.