立式轴流泵装置流动损失及叶轮强度分析  

Analysis on Flow Loss Characteristics in Axial-flow Pumping System and Structural Strength of Impeller

作　　者：杨帆[1,2] 胡文竹 汤方平 张一祁[1] 罗灿 YANG Fan;HU Wenzhu;TANG Fangping;ZHANG Yiqin;LUO Can(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;Hydrodynamic Engineering Laboratory of Jiangsu Province,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009 [2]江苏省水利动力工程重点实验室,江苏扬州225127

出　　处：《应用基础与工程科学学报》2024年第4期1000-1010,共11页Journal of Basic Science and Engineering

基　　金：江苏省高校自然科学研究重大项目(20KJA570001);扬州市科技计划项目(YZ2022192);扬州大学“青蓝工程”项目(扬大人资[2023]40号)。

摘　　要：为了研究立式轴流泵装置的流动损失特征及叶轮疲劳可靠性,对立式轴流泵装置进行了全流道的三维数值模拟,并采用流动熵产理论分析了过流部件的流动损失特征,基于单向流固耦合理论求解了nD值相等时几何相似、结构尺寸不同的叶轮的应力应变,并根据疲劳累计损伤理论对叶轮进行了疲劳可靠性的预测.研究结果表明,立式轴流泵装置内部流动损失主要与湍流流动增加的湍动耗散熵产有关,湍动耗散熵产远大于直接耗散熵产,导叶体的湍动耗散熵产最大.当nD值相等时,随着叶轮直径的增大,叶轮的最大应力及最大变形位移均逐渐减小,最大应力出现在叶片压力面与轮毂的连接位置,等效应力沿叶片展向从轮毂至轮缘逐渐减小,最大变形位移出现在叶片进水边的轮缘处.随着叶轮直径的增加,最小疲劳安全系数逐渐增大,从叶轮的疲劳安全系数角度考虑,应适当增大叶轮的直径,降低叶轮的转速.In order to study on the flow loss characteristics of axial-flow pumping system and fatigue reliability of impeller,the steady three-dimensional numerical simulation was carried out to simulate the internal flow of axial-flow pumping system,which was analyzed by the entropy production theory further.When nD is fixed value,stress and strains of different size impellers were analyzed based on fluid-structure coupling methods.The fatigue reliability of the impeller was predicted according to the Palmgren-Miner theory.The results show that the flow loss in the axial-flow pumping system is mainly related to the entropy production in the turbulent flow.The turbulent dissipation is significantly larger than the direct dissipation no matter in the inlet and outlet conduits or in the guide vane.The turbulent dissipation of guide vane is maximum in all flow domains of axial-flow pumping system.With the increase of impeller diameter,the maximum stress and the maximum strain are gradually decrease.The maximum stress is in the leaf root of blade,and the maximum strain is at the edge of inlet side under different operating conditions.With the increase of impeller diameter,the minimum of fatigue safety factor is gradually increases.It suggests that nD is fixed value,the diameter of impeller should be appropriately increases,and the rotational speed of the impeller should be reduced,according to the fatigue safety factor of impeller.

关 键 词：轴流泵 泵装置 叶轮 熵产 流动损失 结构强度 

分 类 号：TV136.2[水利工程—水力学及河流动力学] TH312[机械工程—机械制造及自动化]