基于流固耦合的大型立式轴流泵机组运行稳定性分析  

Operation stability analysis of large-scale vertical axial-flow pump system based on fluid structure interaction

作　　者：朱峰 潘强[2] 张德胜[2] 陈浩 周伟[1] ZHU Feng;PAN Qiang;ZHANG Desheng;CHEN Hao;ZHOU Wei(Jiangsu Surveying and Design Institute of Water Resources,Co.,Ltd.,Yangzhou,Jiangsu 225009,China;National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏省水利勘测设计研究院有限公司,江苏扬州225009 [2]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2025年第2期124-131,138,共9页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(52209111);江苏省水利科技项目(2021007,2022017);南水北调东线江苏水源有限责任公司科技项目(SSY-YX-2020-F-5)。

摘　　要：轴(贯)流泵机组在中国南水北调、“一带一路”等泵站群建设中运用广泛.为了研究大型轴流泵不同运行工况下流体激励力对机组振动的影响,采用CFX和Mechanical联合实现轴流泵叶片非定常应力的流固耦合计算模拟.流场计算基于RANS方法的N-S方程,结构计算采用弹性结构力学方程,使用任意拉格朗日-欧拉ALE法求解,得到了轴流泵转子变形、应力分布及模态特征.研究结果表明,叶频与压力波动频率一致,叶轮旋转是造成压力脉动的主要原因;叶片的最大变形出现在叶片轮缘处,叶片最大应力出现在叶片与轮毂连接处;在叶轮0.6~1.4倍额定转速内,难以找到转子各阶固有频率与叶频及其倍频均保持一定差值的合理转速,但在忽略次要共振可能性后,存在最优转速以达到固有频率和各阶主频的合理差值.Axial-flow(tubular)pumps are widely used in the construction of pumping stations such as China′s South-to-North Water Diversion Project and“the Belt and Road Initiative”.In order to study the influence of fluid exciting forces on system vibration of large-scale axial-flow pump under several operating conditions,CFX and Mechanical were combined to conduct the numerical simulation of the fluid-structure coupling,as well as the flow-induced unsteady stresses on the blades of the pump impeller.The fluid domain was resolved based on the N-S equation with the RANS method,and the solid domain was calculated by adopting the dynamic equation of elastic structure.The deformation,stress distribution and modal characteristics of the pump rotor were obtained using the arbitrary Lagrange-Euler(ALE)method.The results show that the blade-passing frequency is consistent with the frequency of pressure fluctuations,and the impeller rotation is the main reason for the pressure fluctuation.The maximum deformation on the blade appears at the blade tip,and the maximum stress on the blade occurs at the juncture between the blade and the hub.Within the range of 0.6-1.4 times of the rated speed of the impeller,it is difficult to find a reasonable speed that maintains a certain difference between the natural frequency of each order of the rotor and the blade-passing frequency(or its multiple frequency).However,after ignoring the possibility of secondary resonance,there is an optimum speed to achieve a reasonable difference between the natural frequency and the main frequency of each order.

关 键 词：轴流泵 转子系统 流固耦合 水力激振 共振 

分 类 号：S277.9[农业科学—农业水土工程] TH312[农业科学—农业工程]