Numerical simulation on the gas jet flow field of scarfing machine
- 作者：LI YimingQI FengshengLI Baokuan
- 会议时间：2013-06-01
- 关键词：scarfing machine ; numerical simulation ; slab surface ; scarfing grooves
- 作者单位：School of Materials and Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China
- 母体文献：第五届宝钢学术年会论文集
- 会议名称：第五届宝钢学术年会
- 会议地点：上海
- 主办单位：中国金属学会
- 语种：chi
摘要
Scarfing is a thermochemical process in which the surface defects,like vertical and horizontal cracks,pitting and inclusions,can be removed from a steel slab by melting the metal of the suiface in a thin layer,which can improve the quality of the final products.The nozzle is the core component in the scarfing machine.The structure of nozzle is one of the most important factors to determine the scarfing efficiency.In this paper,a computational fluid dynamics ( CFD) model was developed to elucidate the capability of the scarfing.By using the FLUENT commercial software,the compressible gas flow in the scaring machine was simulated,and the standard k - ε turbulence model was used in this simulation.The current research is an attempt to describe the gas flow condition in the scarfing machine including the gas jets near the exit,the pressure distribution and velocity field on the surface of slab,which can be used to predict the condition of metal removal,and the causes of the scarfing grooves can be analyzed in theory.The scarfing grooves are mainly the result of the mixing of gas jets.The mixing of gas jets leads to the uneven degrees of gas jets on the slab surface,and the distribution of pressures on the slab surface presents like peaks and valleys.So the scarfing grooves are formed.A comparison of the differences between the ability of scarfing the slab surface of two nozzle structures was revealed in this study.After the nozzle improved,the fluctuation of the slab surface pressure distribution was relatively gentle,which to a certain extent explained the improvements of the nozzle could enhance the scarfing effect of the steel slab.The conclusions obtained in this study will provide the manufacturing company a tool to design the optimal scarfing machine nozzle.