南水北调倒虹弯管局部阻力设计方法研究  

Local Resistance Design of Inverted Siphon Bend for South North Water Transfer Project

作　　者：谭兴华 陈全会[2] 高永传 

机构地区：[1]河南省水利勘测设计院,河南郑州450003 [2]河南省黄河河务局,河南郑州450003 [3]新乡市黄河河务局,河南新乡453003

出　　处：《灌溉排水》2000年第4期53-55,74,共4页Irrigation and Drainage

摘　　要：首先论述了倒虹弯管局部阻力产生的机理 ,其次对弯管局部阻力进行了深入系统的分析和试验研究 ,最后得出如下结论 :对于缓弯管 ,以 R/ D=2为宜 ;在弯转角不大时折弯局部水头损失并不比缓弯大 ,并通过模型试验对这一结论进行了验证。结论对南水北调中线工程和平原地区的低水头大流量倒虹工程弯管设计具有重要的应用价值。The mechanism of local resistance at inverted siphon bend, present research trend about local resistance of a bend are discussed and analyzed. Experiment results show that R/D=2 is suitable for slow bend. When θ<20°, the local resistance at a fold bend is not larger than the local resistance at a slow bend. Model test indicates the conclusion is reliable and can be applied to large size inverted siphon with a low water head and great flow rate.

关 键 词：倒虹弯管 局部阻力 设计方法 南水北调 

分 类 号：S274.2[农业科学—农业水土工程]