摘要
上机架是承受水轮发电机组轴向负荷的重要部件,在运行过程中还需承受交变应力作用,由此产生的疲劳破坏问题将造成安全隐患。为保证电站安全稳定运行,以某电站混流式水轮发电机组为例,采用ANSYS Workbench对上机架进行静力学分析,并利用实测数据验证了数值模拟的可靠性。在此基础上,利用Workbench中的疲劳分析模块对上机架进行了疲劳寿命分析。结果表明,上机架疲劳安全系数大于许用安全系数,疲劳寿命为无限寿命,可满足机组安全运行要求。该疲劳分析方法对深入开展水力机械的疲劳破坏研究具有一定的参考价值。
Upper bracket that bears the axial loads is a critical component of hydroelectric set,and it bears alternating stress during the actual operation,which will cause fatigue failure and potential safety problems.In order to ensure the safe and stable operation of hydropower station,this paper took Francis hydroelectric set of a certain power station as an example and used ANSYS Workbench to make a static analysis of the upper bracket.And then the reliability of numerical simulation was verified by the measured data.On this basis,the upper bracket＇s fatigue life was analyzed with the fatigue module of Workbench.The results show that its fatigue safety coefficient is greater than the allowable safety coefficient,and its fatigue life is infinite,which meet the safety running requirement of unit.The fatigue analysis method used in this paper has a reference value in further research about mechanical fatigue of hydraulic machinery.
出处
《水电能源科学》
北大核心
2015年第8期140-143,共4页
Water Resources and Power
基金
国家自然科学基金项目(51379179)
流体及动力机械教育部重点实验室项目(szjj2014-044)
