Analysis of auxiliary gas flow field for laser cutting of medium-thick plates
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摘要: 基于切割区域的高斯热源方程、传热方程、雷诺平均N-S方程以及剪应力输运(shear stress transport, SST) k-ω湍流模型，建立中厚板激光切割辅助气体流场三维数学模型，并通过试验验证了仿真模型的正确性。基于所建立的模型对辅助气体流场进行研究，分析辅助气流压力、温度、速度、剪切应力的分布规律；研究喷嘴入口压力对辅助气体的流场动力性能的影响规律。结果表明，合理的喷嘴入口压力能提高辅助气体动力学特性与切割质量。Abstract: A three-dimensional mathematical model of the auxiliary gas flow field in laser cutting of medium-thickness plates was developed based on the Gaussian heat source equation, heat transfer equation, Reynolds-averaged N-S equation and SST k-ω turbulence model. The validity of the simulation model was verified by experiments. Based on the established model, the distribution of pressure, temperature, velocity and shear stress in the auxiliary gas flow field were analyzed, and the effect of nozzle inlet pressure on the dynamic performance of the flow field was investigated. The results show that a reasonable nozzle inlet pressure can improve the dynamic characteristics of the auxiliary gas and cutting quality.
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Key words:
- laser cutting /
- computational fluid dynamics (CFD) /
- gas dynamics /
- cutting parameters
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图 4 压力场密度梯度波动的数值模拟与试验结果比较
Figure 4. Comparison of density gradient fluctuations in pressure fields between numerical simulations and experimental results
图 9 不同喷嘴入口压力下对称面的速度云图
Figure 9. Velocity clouds in symmetry plane at different nozzle inlet pressures
图 10 不同喷嘴入口压力下切割前沿轴线上的压力分布图
Figure 10. Pressure distribution along cutting front axis at different nozzle inlet pressures
图 11 不同喷嘴入口压力下切割前沿轴线的速度分布图
Figure 11. Velocity distribution along cutting front axis at different nozzle inlet pressures
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