1008-1542 article 斜三通的CFD數值模擬及傳熱影響因素研究 Research on influencing factors of heat transfer and CFD numerical simulation of oblique tee 為研究斜三通管內流體的流動與傳熱過程,應用CFD軟件Fluent分別對管間夾角θ在20°- 90°之間、流速比λ在2-3.5之間以及支管位置l在500mm-1000mm之間的斜三通內流體的流動與傳熱過程進行了數值模擬,并通過正交試驗設計對影響三通壁面平均換熱系數的各參數進行了敏感性分析。結果表明:隨著θ和λ的增大,三通出口處流體最大速度逐漸增大,其中λ的影響更為顯著;壁面平均換熱系數隨θ和λ的增大而增大,隨l的減小而增大;支管位置l主要影響壁面平均換熱系數,對最大速度的影響可忽略不計。按照影響壁面平均換熱系數作用的強弱,支管位置l >流速比λ >管間夾角θ,即支管越靠近主管進口、流速比越大、管間夾角越大,則壁面換熱效果越好。因此,支管位置是影響影響斜三通壁面傳熱效果的首要因素。 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. 節能技術;斜三通;流動與傳熱;管間夾角;流速比;支管位置 energy conservation technology;oblique tee;flow and heat transfer;included angle;velocity ratio;branch position 朱海榮,盧紅亮,崔海亭,鄧小葉 LU Hongliang,CUI Haiting,DENG Xiaoye 河北科技大學機械工程學院 1.School of Mechanical Engineering,Hebei University of Science and Technology,Shijiazhuang,050018;2.China hbkjdx/article/abstract/QB201811280219
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