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基于粒子图像测速(particle image velocimetry,PIV)技术,通过水模型研究临界卷渣条件下卷渣过程和钢包流场特征,解析临界卷渣从发生到结束的整个过程卷渣处流场速度的变化情况,并定量分析炉渣运动黏度对临界卷渣速度的影响.将临界卷渣速度的实验检测值与传统理论计算值进行比较和讨论.研究结果表明:临界卷渣过程从开始到结束可细分为八个不同阶段,卷渣处流场速度变化在这八个阶段中先增大后减小再增大;炉渣运动黏度对卷渣具有重要影响,炉渣运动黏度越大,临界气量和临界卷渣速度越大,并且临界卷渣速度与炉渣运动黏度的关系更具线性相关性.实验拟合得到炉渣运动黏度与临界卷渣速度的关系式.最后根据传统理论计算模型和实测结果提出实验条件下修正的临界卷渣速度表达式.
Based on the particle image velocimetry (PIV) technique, the paper studies the characteristics of the entrapment process and the ladle flow field under the condition of critical entrainment, and analyzes the change of the velocity of the flow field at the entrapped slag from the occurrence to the end of the critical entrainment And the influence of slag kinematic viscosity on the critical volume entrainment rate was quantitatively analyzed.Experimental results of the critical volume entrainment velocity were compared with the traditional theoretical values.The results show that the critical entrainment process can be subdivided from the beginning to the end For eight different stages, the velocity changes of the flow field at the slag-laden slag first increase, then decrease and then increase again during the eight phases; the viscosity of the slag has an important influence on the slag ladle, the larger the kinematic viscosity of the slag, the critical air volume and the critical volume The bigger the slag speed and the more linear correlation between the critical slug speed and the kinematic viscosity of the slag.Finally, the relationship between the kinematic viscosity of the slag and the critical slug speed was obtained experimentally.Finally, the experimental conditions were proposed according to the traditional theoretical model and the measured results Under the revised critical entrainment speed expression.