连续热镀锌线气刀吹锌过程中锌波纹产生的大涡模拟

为寻求连续热镀锌线气刀吹锌过程中带钢上出现锌波纹的原因，采用大涡模拟（Large Eddy Simulation，LES）方法数值求解三维非稳态气刀射流湍流流场，并结合带钢表面的镀锌层厚度的零维预测模型研究锌波纹产生的机理．结果表明，在气刀射流冲击区域两侧有交替成对出现的漩涡，造成带钢表面的压强和切应力周期性波动分布，从而产生锌波纹．

Large eddy simulation of zinc ripple generation in air knife wiping process of continuous hot galvanizing line

To find out the reason that the zinc ripples are often generated on strip in air knife wiping process of continuous hot galvanizing line, the Large Eddy Simulation (LES) method is used to numerically solve the 3D unsteady turbulent jet flow field of air knife, and the zinc ripple generation mechanism is studied by a zero dimensional model for prediction of zinc film thickness on strip surface. The results indicate that the alternating vortices appear in pairs on the both sides of air knife jet impact area, which causes periodically fluctuating distribution of pressure and shear stress on strip surface and results in zinc ripples.