FLOW FIELD SIMULATION OF HOT BASE GALVANIZING AIR KNIFE BASED ON 3D FINITE ELEMENT METHOD
With the rapid development of fields such as automobiles,home appliances and architecture,higher requirements have been put forward for the zinc layer thickness and surface quality of non-spangle galvanized sheets.Air knife is one of the important means to control the thickness and surface quality of zinc coating galvanized sheet.At present,air knife control relies on the experience of technical personnel and has low efficiency.Based on the finite element simulation method,this article conducts a simulation analysis of the flow field during the process of blowing zinc with an air knife for a hot base galvanizing line in a steel plant.Multi working condition simulation analysis was conducted on three key process parameters of air knife injection pressure,air knife distance(from the strip steel),and strip speed.The lateral distribution of shear stress and pressure on the surface of strip steel under a single variable has been obtained.The study analyzed the influence of three key process parameters on the zinc scraping ability of the air knife.The results show that the surface pressure and shear stress of the strip are positively correlated with the pressure of the air knife,and the ability of the air knife to scrape zinc increases linearly with the increase of the air knife injection pressure.The surface pressure and shear stress of the strip are negatively correlated with the distance between the air knife and the strip steel.When the distance between the air knife and the strip steel is 8～13 mm,the distance between the air knife and the strip steel has little effect on the zinc scraping ability of the air knife.When the distance is greater than 13 mm,the zinc scraping ability of the air knife begins to decrease rapidly,and the strip speed has no obvious effect on the zinc scraping ability of the air knife.
hot dip galvanizingfinite element analysisair knifeflow fieldinjection pressureair knife distancestrip speed
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