为研究斜三通管内流体的流动与传热过程，应用CFD软件Fluent分别对管间夹角θ在20°- 90°之间、流速比λ在2-3.5之间以及支管位置l在500mm-1000mm之间的斜三通内流体的流动与传热过程进行了数值模拟，并通过正交试验设计对影响三通壁面平均换热系数的各参数进行了敏感性分析。结果表明：随着θ和λ的增大，三通出口处流体最大速度逐渐增大，其中λ的影响更为显著；壁面平均换热系数随θ和λ的增大而增大，随l的减小而增大；支管位置l主要影响壁面平均换热系数，对最大速度的影响可忽略不计。按照影响壁面平均换热系数作用的强弱，支管位置l >流速比λ >管间夹角θ，即支管越靠近主管进口、流速比越大、管间夹角越大，则壁面换热效果越好。因此，支管位置是影响影响斜三通壁面传热效果的首要因素。
In order to study the flow and heat transfer process of the fluid in oblique tee, the CFD simulation of flow and heat transfer processes of the fluid in oblique tee with the included angle of 20o-90o, the velocity ratio of 2-3.5 and the branch position of 500mm-1000mm were carried out based on Fluent software, and the sensitivity analysis of various parameters influencing the average heat transfer coefficient of wall surface was conducted by orthogonal experimental design. The results show that as the included angle or velocity ratio increases, the maximum velocity of fluid at the outlet of oblique tee increases gradually, and the influence of velocity ratio is more significant. The average heat transfer coefficient of wall surface also increases with the increases of included angle and velocity ratio, but the decrease of branch position; the branch position mainly affects the average heat transfer coefficient of wall surface, and its influence on the velocity is negligible. The average heat transfer coefficient of wall surface is increasing with the decrease of the branch position. According to the different effects of various parameters on average heat transfer coefficient of wall surface, branch position l > velocity ratio λ >included angle θ, which means that the closer the branch pipe is to the inlet of main pipe, the greater the velocity ratio, and the greater the included angle, the better the heat transfer effect of wall surface will be. Therefore, the branch position is the primary factor to influence the heat transfer effect of oblique tee.