基于熵产理论的隔舌几何特征对低比转速PAT能量损失的影响  

The Influence of Geometric Characteristics of Cutwater Based on Entropy Production Theory on Energy Loss of Low Specific Speed PAT

作　　者：杨军虎[1,2] 宋丹玉 李佳旭 胡亚男 王世成 方嘉诚 YANG Jun-hu;SONG Dan-yu;LI Jia-xu;HU Ya-nan;WANG Shi-cheng;FANG Jia-cheng(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu Province,China;Key Laboratory of Fluid Machinery and System,Lanzhou 730050,Gansu Province,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省流体机械及系统重点实验室,甘肃兰州730050

出　　处：《中国农村水利水电》2024年第10期134-142,共9页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(52169019)。

摘　　要：为了探究蜗壳隔舌对泵作透平的水力性能影响,提高泵反转透平的性能。以一比转速为69的单级单吸离心泵反转作透平为研究对象。对隔舌安放角和隔舌半径等几何特征设计了包含原模型在内的9种方案,采用SST k-ω模型,对各方案进行全流道数值模拟,并引入熵产诊断分析方法,分析各方案下透平的压头、效率以及内部流场的变化规律。研究结果表明:在透平叶轮及其他部件不变的情况下,当蜗壳隔舌安放角在一定范围内增大时,在较大流量范围内,液力透平的压头明显会减小;在该透平中,当隔舌半径为1.5 mm时,叶轮与蜗壳内部的熵产损失减小,使透平效率增加。In order to investigate the influence of cutwater on the hydraulic performance of the pump as a turbine(PAT)and improve the performance of the pump operated in reverse as a turbine,a single-stage single-suction centrifugal pump with a specific speed of 69 was selected as the research object.Nine schemes,including the original model,with variations in cutwater placement angle and cutwater radius,were designed.Using the SST k-ωmodel,numerical simulations of the entire flow passage were conducted for each scheme.Entropy production diagnostic analysis was introduced to analyze the variations in head,efficiency,and internal flow field of the PAT under different schemes.The research results show that within a certain range,increasing the cutwater placement angle leads to a significant reduction in head of the hydraulic PAT in the larger flow rate range.In this PAT,when the cutwater radius is 1.5 mm,the entropy production loss inside the impeller and volute is reduced,resulting in an increase in PAT efficiency.

关 键 词：泵作透平 水力性能 蜗壳隔舌 内流场 熵产分析 

分 类 号：TH311[机械工程—机械制造及自动化] TK73[交通运输工程—轮机工程]