摘要
针对混流式水轮机转轮密封间隙所引起的自激振动的问题,本文采用计算流体动力学软件CFX,基于N-S方程和RNGk-ε湍流模型,通过对含转轮上冠密封间隙及下环间隙的某水电站原型水轮机进行三维全流道数值计算,根据不同上冠密封间隙值的压力变化规律,提出了转轮上冠密封间隙值的稳定区和非稳区概念;分析了下环间隙对水轮机转轮进口和尾水管进口压力的影响,得出了在密封间隙的影响下转轮进口和尾水管进口的压力分布规律。为水轮机组在设计和运行时避免自激振动提供了一定的参考依据。
Self-excited vibration of a Francis runner is easily resulted by an improper sealing clearance of the runner crown.This paper presents the results of 3D full passage simulation of a prototype turbine of a hydropower station by using the CFD software SFX that solves the Navier-Stokes equations with a RNG k-ε model.This study focuses on the pressure distribution at the runner inlet and the draft tube inlet and the influence of the sealing clearances of the runner crown and the ring,and proposes a concept of stability domain related to the sealing clearances.The results provide a reference for the design and operation of hydraulic turbine to avoid self-excited vibration.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第4期219-223,共5页
Journal of Hydroelectric Engineering
基金
陕西省科技计划资助项目(DJ08E222)
陕西省教育厅科学技术研究计划资助项目(自然科学专项)(08JK390)
关键词
水力机械
混流式水轮机
全流道数值计算
自激振动
密封间隙
hydraulic machinery
Francis-turbine
turbulence numerical simulation of the whole flow passage
self-excited vibration
sealing clearance
