空气外掠钢渣颗粒准则关系式及其影响因素

通过空冷固态高温钢渣颗粒实验，由实验数据拟合平均努塞尔数实验关联式。对空冷高温钢渣颗粒进行三维数值模拟，研究不同绕流雷诺数下的准则关系式，分析空气外掠固态钢渣颗粒影响因素。研究得出空气冷却固态钢渣颗粒的实验关联式与数值计算关联式，实验与数值计算之间误差较小，验证了采用SST k-棕模型计算的可靠性。实验结果表明：钢渣颗粒的平均努塞尔数随着绕流雷诺数、粒径和气体流速的增大而增大。在同等条件下，钢渣粒径对平均努塞尔数的影响作用大于气体流速；模拟空冷高温钢渣颗粒时，直径对钢渣颗粒凝固时间的影响作用最大，导热系数的影响作用次之，来流空气温度影响作用最小。

Criterion equations and influencing factors of air flow around steel slag particles

The experiment of air flowing high-temperature steel slag particles was done and the experimental correlation of non-di-mensional average Nusselt number was fitted. A three-dimensional numerical simulation of air-cooled high-temperature steel slag parti-cles was performed to study the criterion equations in different conditions and to analyze the influencing factors of air sweeping solid steel slag particles. The experimental correlation and numerical calculation of air-cooled solid steel slag particles were gained, and the error between the experimental and numerical calculation is very small, which verifies the reliability of the SST k-ωmodel. The results show that the average Nusselt number of slag particles increases with the increase of streaming Reynolds number, particle diameter, and air velocity. The particle diameter effect on the average Nusselt number is larger than the air velocity under the same conditions. The influence of the steel slag particle diameter on the solidification time is the largest, the thermal conductivity is the second, and the air stream temperature is the smallest.