水轮机应用蜂窝密封的吸水和减振模拟试验  

Simulation experiment on water pumping and vibration suppression of Francis-turbine applying honeycomb seals

作　　者：何立东[1] 尹德志[1] 李承曦[1] 伍伟[1] 

机构地区：[1]北京化工大学诊断与自愈工程研究中心,北京100029

出　　处：《排灌机械工程学报》2010年第3期215-218,共4页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(50675013);国家863计划项目(2007AA04Z422)

摘　　要：为减少混流式水轮机止漏环中流体产生的自激振动,根据止漏环各种密封结构,简化并提出密封模型,并根据模型搭建了试验台.采取直接测量转轴振动的方法,对比了简化后的密封模型与蜂窝密封在调整转子偏心程度的情况下振动幅值、波形图和频谱图的差别,以及增加转子质量不平衡块后两种密封振动幅值的变化.结果表明,蜂窝密封比普通的迷宫密封更能够抑制由于偏心和不平衡引起的振动.在最小密封间隙的上下游安置吸水装置,对比其振动情况,上游吸水可有效地降低转子振动.According to the structures of seal rings in Francis-turbine,the sealing model was simplified and advanced in order to reduce self-excited vibration produced by fluid in seal rings of the Francis-turbine.The experiment rig was manufactured based on the model.By measuring the rotor vibration directly,the vibration amplitude,oscillogram and frequency spectrogram between the simplified sealing model and honeycomb seals were contrasted under the conditions of various rotor eccentricity,and the vibration amplitude features of the two kinds of seals with and without imbalance mass added to the rotor were investigated.The results show that compared with the labyrinth ones,the honeycomb seal can more effectively suppress the vibration caused by rotor eccentricity and mass imbalance.The vibration behaviors are contrasted by installing water pumping device in upstream and downstream of minimal seal clearance,and the water pumping device in upstream of minimal seal clearance can significantly reduce rotor vibration.

关 键 词：混流式水轮机 止漏环 蜂窝密封 减振 吸水 

分 类 号：S277.9[农业科学—农业水土工程] TK730.3[农业科学—农业工程]