微型低比转速混流式水轮机的水力特性分析  

Analysis on hydraulic characteristics of micro Francis hydro-turbine with low specific speed

作　　者：张兰金[1] 王磊 任岩[1] 陈德新[1] 

机构地区：[1]华北水利水电学院,河南郑州450045 [2]华电电力科学研究院,浙江杭州310030

出　　处：《水利水电技术》2013年第1期128-130,共3页Water Resources and Hydropower Engineering

基　　金：华北水利水电学院高层次人才启动基金(201079)

摘　　要：本文介绍了一种由冷却塔中冷却循环水驱动的微型水轮机。该机流量限于循环水流量、功率限于风机功率、水头依赖流量与功率;其蜗壳平面尺寸小,不设导水机构,转轮流道狭长。为了解该水轮机的水力特性,采用数值模拟与试验相结合的方法对其进行研究。研究表明:对于同一水轮机,其内流场特性表现出相似性,能量和压力脉动等水力特性也表现出相似性,水力效率相等,水力损失相等。该水轮机的水力效率较低,水力损失较大,其水能主要损失于引水部件,其次是转轮;由于引水部件距离转轮近,其固定导叶叶道的水力振动幅度达到10%以上。A micro Francis hydro-turbine driwen by the eireulatiug cording water in cooling tower is introduced herein; of which the flow rate is restricted to tire circulating water discharge, the orrtput power is confined I head is relied on hoth the discharge and the output power. It has a small dimension with a 1 anti without water guiding mechanism. In order to know the hydraulic eharaeterislies of it, a study is made with the method of nu- merieal simulation combined wilh Ihe relevant experiment. The strldy resuh shows Ihat similarities are presented by the eharaeter- isties of the flow fieht inside of it, while the hydraulic characteristics of energy, pressure fluctuation, etc. also show similarities with the same hydraulic effieieney atrd loss. The hydraulic efficiency of the lurbine is lower with a larger hydraulie loss ; of which the hydro-energy is lost mainly from the water diversion parts and secondly from the runner. Furlhermore, the amplitude of tire hydraulic vihration on the blade channel of stay vane is higher over 10% due to a less space between both the diversion parts and the runner.

关 键 词：微型水轮机 低比转速 水力性能 

分 类 号：TK73[交通运输工程—轮机工程]