2个U型组合的90°4片弯管的局部水头损失及相互影响  

Local head loss and interaction of U-shaped 90° ducts

作　　者：唐博[1] 李进平[1] 罗文[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2013年第5期557-561,571,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助项目(编号:50909076)

摘　　要：2个U型组合的90°4片弯管流场非常复杂,确定其水头损失和相互影响系数不容易,一般水力计算手册中对此也尚乏介绍.采用计算流体动力学理论和计算方法,在验证了数学模型和网格划分方法可行性和准确性的前提下,模拟了2个U型组合的90°4片弯管流场并计算了该管段的局部水头损失,分析了相互影响系数随Ls/D的变化规律.研究表明:增大转弯半径可以减小局部水头损失;减小2个90°4片弯管间的直管长度可以减小局部水头损失;相互影响系数随Ls/D增大而不断趋近1.0;若R/D≥1,则当Ls/D等于0时,该值取得最小,局部水头损失也最小.Flow field of U-shaped 90° ducts is extremely complicated, figuring out the head loss and interac- tive coefficient is a tough task and not enough data can be referred. This paper simulates the flow field ap- plying the method of computational fluid dynamics, calculates local head loss and analyzes the varying rule of interactive coefficient according to the value of Ls/D, where Ls is the length of straight duct; D is diam- eter of duct. The results indicate that both increasing the radius of duct and cutting the straight duct be- tween them can decrease local head loss effectively; and that interactive coefficient approaches 1.0 as Ls/D mounts; meanwhile, in circumstances that Ls/D equalizes zero with the premise that R/D≥ be satisfied, where R is the turning radius, the value of interactive coefficient reaches the minimum and as conse- quences, local head loss get the minimum value.

关 键 词：弯管 局部水头损失 相互影响系数 数值模拟 

分 类 号：TV732.5[水利工程—水利水电工程]