Abstract: In order to ensure the process temperature of copper brazing,the structure of continuous CuproBraze furnace was improved;the hot air stirring device and uniform flow orifice plate was used to improve the temperature uniformity.The performance of orifice plate was studied,and the influence of opening rate and opening mode on temperature distribution in the chamber was investigated by using computational fluid dynamics simulation technology.The results show that the temperature uniformity is better than others when the orifice plate with 50% opening rate is used.At the same opening rate,the opening mode also affects the temperature difference between the work positions.When the uniform flow orifice plate with 50% opening ratio,under the mode of opening rate at both ends is larger than that of middle can effectively control the temperature difference.The porous medium is used to simplify the structure of the orifice plate,which can reduce the difficulty of modeling and reduce the time of analysis.It provides the basis for the analysis and optimization design of the similar structure.

Key words: CuproBraze, uniform flow orifice plate, porous medium, temperature distribution