基于workbench的混流泵反向发电疲劳寿命分析

Fatigue Strength Checking of Francis Pump Reverse Power Generation Based on Workbench

部分泵站可进行反向发电工况运行,可以为泵站创造一定的经济效益。此时水泵转轮处于非设计工况,运用双向流固耦合对此时转轮的应力及变形规律进行研究,得出转轮最大应力发生在叶片进水侧叶片与转轮连接处,约为5.8 MPa,并从轮毂向轮缘处逐渐递减;最大形变发生在转轮叶片的进水口边缘处,约为0.013 mm,从轮缘向轮毂中心递减。根据转轮的应力分布情况进行理论计算,最小安全系数为9.24。利用workbench平台中的专业疲劳分析模块,利用疲劳分析工具Fatigue tools估算转轮的疲劳寿命,得出转轮根部为疲劳安全系数最小的部位为9.088 2,与转轮最大应力分布位置相同。两者的安全系数值均在转轮的疲劳寿命在材料安全范围内,在反向发电运行时满足安全稳定的要求。

Some pumping stations can operate in the reverse power generation mode, which can create certain economic benefits for pumping stations. At this point, the pump runner is in an off-design condition, and the stress and deformation of the runner are studied by using the two-way fluid-solid coupling method. The results show that the maximum stress of the runner occurs at the junction of the inlet blade and the runner, about 5.8 MPa, and gradually decreases from the hub to the flange;the maximum deformation occurs at the inlet edge of the runner blade. The edge is about 0.013 mm, descending from the flange to the hub. According to the stress distribution of the runner, the theoretical calculation value of fatigue life is 9.24. Based on the professional fatigue analysis module of workbench platform, the fatigue life of the runner is estimated by fatigue tools. It is concluded that the minimum fatigue safety factor is 9.088 2 at the root of the runner and the maximum stress distribution of the runner. Set the same. Both safety factors are within the material safety range of the fatigue life of the runner, and meet the requirements of safety and stability in the reverse power generation operation.