新型电力系统需求下大型水电机组转轮疲劳寿命预估OA

In the context of the goal of'carbon peaking and carbon neutrality',domestic large units inevitably need to undertake the task of shifting from based-load operation to load adjustment mode,which leads to a significant increase in the number of start-stop times and long-term unstable operation conditions.Although the existing studies show that the fatigue life of the runner is significantly affected by the running state of the unit,the calculation of the runner stress of large units under the conditions of start-stop,idling and variable load is still relatively scarce.In order to study the variation of runner stress of a large unit under complex working conditions,this paper takes a large hydropower station as an example to analyze the flow characteristics and stress intensity of the runner of a large mixed-flow unit under different operating conditions by CFD method.The research results reveal the theoretical life span of the large unit under the current operating conditions.