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在激光同轴送粉中,存在激光能量的吸收和衰减过程。利用Beer-Lambert定律,建立了同轴送粉中气粉两相流的温度场理论计算模型。依据所建立模型数值模拟研究了激光熔覆中的各种参数对温度场变化的影响,如激光功率、送粉量和送气量等。为验证计算模型的有效性,采用CCD实验测量粉末流温度值,从粉末流温度场分布图中可以看到。实验结果与理论计算结果十分接近。研究粉末流温度场分布情况对提高激光熔覆质量有很大帮助。
In the laser coaxial powder feeding, there is laser energy absorption and attenuation process. Based on the Beer-Lambert law, the theoretical model of the temperature field of gas-liquid two-phase flow in co-feeding powder is established. According to the numerical simulation of the established model, the influence of various parameters in the laser cladding on the variation of the temperature field, such as the laser power, the amount of powder supplied and the amount of air delivered, was studied. In order to verify the validity of the computational model, the temperature of powder flow was measured by CCD experiment, which can be seen from the temperature field distribution of powder flow. Experimental results and theoretical calculations are very close. Studying the distribution of temperature field in powder flow is very helpful to improve the quality of laser cladding.