基于PIV技术的钢包临界卷渣行为水模型研究

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。

Water model study on critical slag entrapment behavior based on PIV technology

The slag entrapment process and the flow field of a specific ladle at critical flow rate are investigated based on particle image velocimetry ( PIV) technology, and the change of fluid velocity at the region where slag is entrapped into steel during the whole slag entrapment process is studied by water modelling. The influence of the kinematic viscosity of slag on the critical slag entrapment velocity is analyzed quantitatively. The critical slag entrapment velocity collected from experiments is compared with the calculated one by the traditional theory. It is shown that the critical slag entrapment process can be divided into 8 stages from the occurrence to the end, and the fluid velocity at the point where slag is entrapped into steel increases first, then decreases and increases again during the 8 stages. The kinematic viscosity of slag has great influence on slag entrapment. When the kinematic viscosity of slag increases, the critical flow rate and critical slag entrapment velocity enlarge, and the linear correlation relationship between the critical slag entrap-ment velocity and the kinematic viscosity of slag becomes more obvious. A relational expression between the critical slag entrapment velocity and the kinematic viscosity of slag is derived from experimental data by liner fitting. At the end of this article, a correctional expression of the critical slag entrapment velocity is put forward based on the experimental data and the theoretically calculated values.