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在激光同轴送粉熔覆中,由于激光与粉末流相互作用,粉末流整体温度分布直接影响激光熔覆的质量。基于非预混燃烧模型,将激光相处理为连续性介质,粉末颗粒相看作离散相物质,建立了激光作用下粉末流的质量、动量和能量方程。用Fluent软件进行了不同激光功率和粉末流速度条件下粉末流整体温度场数值模拟,讨论了各种参数对温度场分布的影响。为了验证该模型的准确度,利用CCD比色测温方法测量了粉末流整体温度场分布。结果表明,数值模拟与CCD检测结果具有良好的一致性,数值模拟结果对激光熔覆具有指导意义。
In the laser coaxial powder cladding, the overall temperature distribution of the powder flow directly affects the quality of the laser cladding due to the interaction between the laser and the powder flow. Based on the non-premixed combustion model, the laser phase was treated as a continuous medium and the powder particle phase as a discrete phase. The mass, momentum and energy equations of the powder flow under laser irradiation were established. Fluent software was used to simulate the whole temperature field of powder flow under different laser power and powder flow velocities, and the influence of various parameters on the temperature field distribution was discussed. In order to verify the accuracy of the model, the temperature field distribution of powder flow was measured by CCD colorimetric method. The results show that the results of numerical simulation and CCD have good agreement, and the numerical simulation results are instructive for laser cladding.