连续热镀锌过程带钢边部气流特性的研究

摘要

To explore the strip edge pressure decreases as gas⁃jet wiping in hot⁃dip galvanizing process, a gas impact plate experiment was carried out, and the process of gas jet wiping was also simulated using the measured results. The added edge baffle near the edge of strip which is used to prevent the wall pressure decreases in strip edge was optimized with the help of the analytic model of film thickness. The results show that the airflow of strip edge occurs lateral deflection and the wall pressure in the strip edge is lower than those in center, in addition, the edge air pressure attenuation increases with the rising distance between the air knife and the strip. The edge pressure decreases and the edge over coating problem can be reduced effectively by adding edge baffle, and the best result happens when the thickness of baffle is 2 mm.%为探究连续热镀锌气刀射流拭锌过程中发生的带钢边部压力衰减问题，设计了气流冲击平板实验，对带钢表面气流流向及压力进行测定。基于测量的参数，对该气刀射流喷吹过程进行数值模拟，并结合所推导的镀层厚度计算模型，对为减少带钢边部压力衰减所增设的边部挡板进行了厚度优化。研究结果表明：气刀喷吹时带钢边部气流发生横向偏转，使得带钢边部压力较中心处低，气压衰减率随气刀与带钢的间隔距离增加而增加，增设边部挡板能有效阻碍带钢边部压力衰减和降低边部过镀锌缺陷发生，且挡板厚度为2 mm时的作用效果最佳。