叶轮疲劳分析评定方法研究

Research on the Assessment of the Impeller Fatigue Analysis

在三代核电厂中,反应堆冷却剂泵是主回路中的关键设备,其中叶轮是冷却剂泵的水力转动部件之一,通常会受到高周的水力载荷。三代核电的设计要求叶轮服役时间长达60年,载荷循环远超1010次,因此必须按照无限寿命疲劳强度设计。本文给出了一种可应用于工程的叶轮疲劳分析计算流程。在叶轮表面的压力时程已经通过流场分析给定并转换为功率谱密度的条件下,通过商用软件的功率谱密度分析方法可以获得叶轮所受应力的范围。最终根据应力疲劳分析理论,折算得到叶轮许用的疲劳强度,以此评定叶轮所受的应力是否满足无限寿命设计。

Reactor coolant pump is the major equipment in the nuclear power plant of the generationⅢ,and the impeller is one of the hydraulic rotating part,and excited by the high frequency hydraulic load.The service time of the impeller in the design requirements of the generation Ⅲis 60 years,the load cycle is more than 1010,so it is designed under the limit of infinite life.In this paper the analysis program of the impeller fatigue applied to the engineering project is presented.Were the pressure transient obtained from fluid analysis and transformed to power spectral density,the stress range of the impeller could be solved by the PSD analysis in the commercial software.Finally according to the stress fatigue theory,the converted fatigue strength of the impeller could be obtained,and the impeller stress could be assessed whether to satisfy the infinite life design.