摘要
水轮发电机组在运行过程中的工况复杂多变,致使转轮叶片产生激烈振动,为了探究工况参数对转轮叶片振动特性的影响,基于Sobol’法对转轮叶片的动态响应进行灵敏度分析。首先,根据转轮叶片的动力学模型推导转轮叶片动态响应的表达式;然后,基于Sobol’法推导转轮叶片动态响应对工况参数的灵敏度,揭示转轮叶片动态响应与工况参数之间的内在关系;最后,通过实例计算转轮叶片动态响应对转速的灵敏度,分析转速对转轮叶片动态响应的影响。结果表明,在转速/额定转速为0.6以及1.2时,转轮叶片动态响应对转速最为敏感,这为进一步深入研究转轮叶片的振动控制及机组的安全运行等提供一定的理论依据。
The frequently changing of working conditions of hydraulic turbine generator units during operation will lead to the intense vibra⁃tion of runner blades.In order to explore the influence of working condition parameters on the vibration characteristics of runner blades,an analysis of the sensitivity of the runner blade dynamic response is carried out based on Sobol’method.Firstly,according to the dynamic mod⁃el of runner blade,the expression of dynamic response of runner blade is deduced.Then,based on Sobol’method,the sensitivity of runner blade dynamic response to working condition parameters is deduced,and the internal relationship between the runner blade dynamic re⁃sponse and working condition parameters is revealed.Finally,the sensitivity of runner blade dynamic response to speed is calculated through an example,and the influence of speed on the runner blade dynamic response is analyzed.The results show that when the speed/rated speed is 0.6 and 1.2,the dynamic response of the blade is the most sensitive to speed,which provides a theoretical basis for a further research on the vibration control of the runner blade and the safe operation of the units.
作者
李兆军
张光政
刘福秀
丁江
LI Zhao-jun;ZHANG Guang-zheng;LIU Fu-xiu;DING Jiang(School of Mechanical Engineering,Guangxi University,Nanning 530004,Guangxi,China)
出处
《中国农村水利水电》
北大核心
2022年第11期212-214,219,共4页
China Rural Water and Hydropower
基金
国家自然科学基金(51465001,51905113)。
