摘要
为研究来流条件对灯泡贯流泵装置水力性能的影响,采用计算流体动力学方法对均匀和非均匀来流条件下的灯泡贯流泵装置内部非定常流动特性进行数值计算.从泵站进水前池出口断面提取速度分布数据作为模型泵非均匀来流条件,并与均匀来流进行对比.基于N-S方程和SST湍流模型模拟灯泡贯流泵装置内部的多工况非定常流动,并通过熵产方法和压力脉动对比分析了不同来流条件下模型泵装置水力损失和流场特性.研究结果表明:给定的非均匀来流条件会造成叶轮域和导叶域流动的非均匀性,降低了泵装置的水力性能;基于总压损失和熵产损失的对比分析,发现熵产分析方法能够评估过流部件的水力性能,其中起主导作用的是脉动熵产和壁面熵产;考虑单个网格体积的影响,进行熵产损失可视化并量化了局部高损失区域;通过压力脉动的幅频特性发现非均匀来流不会改变贯流泵装置原有的幅频特性,但会增大脉动幅值,不利于泵装置的稳定运行.
In order to study the effect of flow conditions on the hydraulic performance of bulb pump systems,computational fluid dynamics methods were used to numerically calculate the unsteady flow characteristics inside bulb pumps under uniform and non-uniform flow conditions.The velocity distribution data were extracted from the outlet section of the inlet passage in the pump station as the non-uniform inflow conditions of the model pump,and the uniform inflow was compared.Based on the N-S equation and SST turbulence model,the unsteady flow behavior under multiple working conditions in the bulb tubular pump was simulated.The hydraulic losses and flow fields characteristics of the model pump system under different inflow conditions were analyzed by using the method of entropy generation and pressure fluctuation.The results show that the given non-uniform inflow conditions will cause non-uniformity flow in the impeller and diffuser domains,reducing the hydraulic performance of the pump systems.Based on the comparative analysis of total pressure loss and entropy production loss,it is found that the entropy production analysis method can evaluate the hydraulic performance of flow components.The energy loss mainly cover turbulent entropy production and wall entropy production.The effect of single grid volume on the local power loss area were visualized and quantified with entropy production theory.Through the pressure pulsation characteristics analysis,it is found that the non-uniform inflow conditions does not change the original amplitude frequency characteristics of the cross flow pump systems,but it will increase the fluctuation amplitude,which is not conducive to the stable operation of the pump device systems.
作者
孙龙月
孙猛
潘强
张德胜
SUN Longyue;SUN Meng;PAN Qiang;ZHANG Desheng(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Main Irrigation Channel Management Division of Jiangsu Province,Huaian,Jiangsu 223200,China)
出处
《排灌机械工程学报》
北大核心
2025年第5期455-462,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(52209111)
江苏省自然科学基金资助项目(BK20220542)
江苏省水利科技项目(2021007)
江苏省研究生创新计划项目(KYCX21_3356)。
关键词
灯泡贯流泵
非均匀来流
熵产理论
压力脉动
数值计算
bulb tubular pump
non-uniform inflow
entropy production theory
pressure fluctuation
numerical simulation
