基于熵产理论的管道泵流动损失特性分析  

Flow loss characteristics of pipeline pump usingentropy production theory

作　　者：王勇[1,2] 李明[2] 王雪 王哓林 赵建林 陈杰 WANG Yong;LI Ming;WANG Xue;WANG Xiaolin;ZHAO Jianlin;CHEN Jie(Department of Precision Manufacturing Engineering,Suzhou Vocational Institute of Industrial Technology,Suzhou 215104,China;Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China;Chongqing Vocational Institute of Engineering,Chongqing 402260,China;Zhejiang Jiali Technology Co.Ltd.,Hangzhou 311241,China)

机构地区：[1]苏州工业职业技术学院精密制造工程系,苏州215104 [2]江苏大学流体机械工程技术研究中心,镇江212013 [3]重庆工程职业技术学院,重庆402260 [4]浙江佳力科技股份有限公司,杭州311241

出　　处：《农业工程学报》2024年第20期72-80,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：江苏省自然科学基金项目(BK20241801);国家自然科学基金项目(U23A20672)。

摘　　要：为了揭示管道泵运行过程中的流动损失特性,基于熵产理论,采用数值计算方法对管道泵吸水室和叶轮内的总熵产以及局部熵产率进行了研究,并结合压力脉动及涡核分布对其产生流动损失的原因进行了分析。研究结果表明,叶轮总熵产和吸水室总熵产保持高度一致性,吸水室内部流动影响了叶轮内部流动。随着流量的增大,叶轮和吸水室总熵产先减小,随后增大,这与其内部监测点的压力脉动主频幅值变化规律基本一致。叶轮总熵产显著大于吸水室总熵产,偏工况下更为明显,前者至少是后者的4倍。湍流耗散熵产占据吸水室和叶轮总熵产的90%以上,构成了流动损失的主要部分。吸水室高熵产率区主要分布在第二弯道及出口处,小流量工况下的熵产率是其余工况下的数百倍,该位置的大尺度带核涡以及附壁涡是导致熵产率增加的主要原因。叶轮高熵产率区主要集中在叶轮进口和出口,在大部分区域,小流量下的熵产率是其余工况的6倍以上,小流量工况下叶轮进口预旋和出口失速涡以及大流量工况下叶轮中上游的分离涡是导致熵产率较高的主要原因。该研究可为管道泵局部流动损失识别以及开展针对性优化提供参考。The inlet structures of pipeline pump are characterized by the elbow bend pipe.The inlet structures are susceptible to inlet reflux and uneven impeller inflow,leading to substantial hydraulic losses.This study aims to investigates the flow loss characteristics during the operation of pipeline pump using numerical simulation method.Computational fluid dynamics(CFD)was employed to predict the energy characteristics and internal flow patterns.An opening test bench was established to measure the performance parameters of the pipeline pump.A comparison of performance parameters between numerical results and experimental data was conducted to validate the reliability of numerical simulation method.The entropy production theory was also used to qualitatively and quantitatively analyze the magnitude,and identify the specific location of flow loss.A system analysis was made to recognizing the significant impact of suction conditions on the impeller inlet,and the flow state inside the impeller dominates the energy conversion efficiency of the entire pipeline pump.Therefore,the entropy production of the suction and impeller was discussed emphatically,and explore to construct the relationship between the flow loss and the flow field.The results indicate that the energy curve obtained by numerical simulation method was better consistent with the experimental results data.The numerical results data was much little higher than the experimental results ones,but the error between the two was less than 5%,indicating that high credibility of the employed numerical simulation method.The total entropy production of the suction and impeller exhibited a trend of initially decreasing and then increasing with rising flow rate.This behavior was aligned closely with the variation in the main frequency amplitude of pressure fluctuation observed at internal monitoring points.Notably,the total entropy production was smaller in the high-efficiency region and,whereas,the larger in the low-efficiency region,indicating that the entropy production

关 键 词：管道泵 流动损失 熵产 压力脉动 涡 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]