座环对微型混流式水轮机水力效率的影响  

Hydraulic Efficiency of Micro-Francis-Turbines for Different Stay Rings

作　　者：张兰金[1] 任岩[1] 李延频[1] 陈德新[1] 

机构地区：[1]华北水利水电学院,郑州450045

出　　处：《中国农村水利水电》2012年第5期75-77,共3页China Rural Water and Hydropower

基　　金：华北水利水电学院高层次人才启动基金项目(201079)

摘　　要：为了使冷却塔节能,使用水轮机代替电机驱动塔内风机,节约电机所需电能。水轮机串联于冷却塔循环水系统中,利用循环水余压工作,水头和流量受限于循环水系统,主轴与风机主轴直联,因此功率小、水头低,属于微型超低比转速混流式水轮机。水轮机的引水部件水力损失大,是水轮机水力损失的主要部分,针对等厚度固定导叶、翼型固定导叶和无固定导叶3种座环进行研究。研究表明:①无固定导叶座环的水轮机水力效率比等厚度固定导叶座环高出10%,利用水头降低了2m,可改进蜗壳设计提高水轮机的利用水头。②翼型固定导叶座环的水力效率比等厚固定导叶座环高出3%,其利用水头相似。The hydraulic turbine, working by the saving-water energy of water recycling system, replaces the motor to drive the fan to save energy of cooling towers. It stands on the water recycling system, so its output is high and the head is low. So the water tur- bine generally is micro-Francis-turbine. For this hydraulic turbine, the hydraulic loss of stay ring is high to lower hydraulic efficien- cy. This paper studies stay vanes with the same thickness, aero[oil stay vanes and no stay vane stay rings. The results show that hy- draulic efficiency of no stay vanes, stay rings is 10% higher than stay vanes , stay rings with the same thickness, and the head is low- er than 2 m. The head of no stay vanes and stay ring water turbines can improve by increasing the outside circulation of spiral casing. The hydraulic efficiency of aerofoil stay vane is 3% higher than stay vanes, stay rings with the same thickness.

关 键 词：水轮机 水力性能 座环 

分 类 号：TK734[交通运输工程—轮机工程] TH318[动力工程及工程热物理—流体机械及工程]