The influence of gas jet velocity in laser heating—a moving workpiece case
The influence of gas jet velocity in laser heating—a moving workpiece case
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气体射流速度对激光加热的影响——移动工件案例
DOI：
10.1243/0954406001523524
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
B. S. Yilbas
中科院分区：
文献类型：
--
作者：
S. Z. Shuja;B. S. Yilbas
本文研究了气体射流辅助激光加热有限厚度运动钢衬底的问题。在模拟加热过程中，引入了具有可变气体性质的三维流动和能量方程。湍流模型采用低雷诺数k-ε模型。采用控制体积法对控制方程进行离散。对三种辅助气体射流速度(100、10、1m/S)和恒定工件速度(0.3m/S)进行了重复模拟。研究发现，在激光加热过程中，辅助气体射流速度对表面温度的影响在冷却循环中比在加热循环中更为显著。工件的移动会影响表面最高温度的位置，在工件的运动方向上，最高温度会远离最初照射的光斑中心。
Abstract In the present study, gas jet-assisted laser heating of a moving steel substrate with finite thickness is considered. Three-dimensional flow and energy equations with variable properties of the gas are introduced in modelling the heating process. The low Reynolds number k-ε model is employed to account for the turbulence. A numerical scheme using a control volume approach is introduced to discretize the governing equations. The simulation is repeated for three assisting gas jet velocities (100, 10, 1 m/s) and a constant workpiece speed (0.3 m/s). It is found that the effect of assisting gas jet velocity on the surface temperature is more pronounced in the cooling cycle than in the heating cycle of the laser heating process. The workpiece movement affects the location of the maximum temperature at the surface, which moves away from the initially irradiated spot centre in the direction of motion of the workpiece.