灯泡贯流泵局部熵产与能量损失特性研究  

Investigation of Local Entropy Generation and Energy Loss Characteristics of the Bulb Tubular Pump

作　　者：潘强[1,2,3] 孙龙月 丁威 张德胜 施卫东[5] PAN Qiang;SUN Longyue;DING Wei;ZHANG Desheng;SHI Weidong(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Wenling Fluid Machinery Technology Institute of Jiangsu University,Wenling,Zhejiang 317525,China;Shimge Pump Industry(Zhejiang)Co.,Ltd.,Wenling,Zhejiang 317525,China;Ebara Machinery(China)Co.,Ltd.,Zibo,Shandong 255035,China;School of Mechanical Engineering,Nantong University,Nantong,Jiangsu 226019,China)

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]江苏大学流体机械温岭研究院,浙江温岭317525 [3]新界泵业(浙江)有限公司,浙江温岭317525 [4]荏原机械(中国)有限公司,山东淄博255035 [5]南通大学机械工程学院,江苏南通226019

出　　处：《西安交通大学学报》2023年第1期131-140,共10页Journal of Xi'an Jiaotong University

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);江苏省杰出青年基金资助项目(BK20211547)。

摘　　要：为了研究大型灯泡贯流泵的能量损失特性,采用基于有限体积法的数值模拟,结合局部熵产率和网格尺度,通过熵产理论定位贯流泵内能量损失较高的局部区域,分析了不同工况下各部件内局部熵产、能量损失和不稳定流动之间的关联。结果表明:贯流泵系统熵产与试验功率损失保持较高的一致性,相比于大流量工况,小流量液流正冲角更容易诱导能量损失;叶轮轮缘局部熵产最高,体积占比14%的轮缘子域耗散熵产占比超过40%,由叶顶区泄漏流和泄漏涡导致;导叶轮毂和轮缘侧耗散熵产较高,且呈现轮毂侧分散、区域大极值小,轮缘侧集中、区域小极值大的分布特性;灯泡体能量损失在小流量工况下集中在尾部渐缩段,在大流量工况下集中在灯泡尾部的尾迹区。该研究成果对大型泵站群水力性能优化设计及高效、稳定运行具有参考价值。To study the characteristics of energy loss in large-scale bulb tubular pump, numerical simulation based on the finite volume method is used to analyze the correlation among the local entropy generation, energy losses and unsteady flow of each component in different working conditions by combining the local entropy generation rate and mesh size and by locating the local regions with high energy loss within the tubular pump with the entropy generation theory. The results show that the calculated entropy generation of the bulb tubular pump is highly consistent with the measured energy loss, and flow instability and energy loss are more easily to be caused at positive incidence angle at lower flow rates. Local entropy generation peaks near the shroud of the impeller that more than 40% dissipative entropy generation is caused by the sub-region occupying roughly 14% of the total volume, which can be attributed to the leakage flow and leakage vortex in the blade tip region. The dissipative entropy generation in the region of guide vane reaches relatively high value at both hub and shroud side, showing the characteristics of large volume and low level at the hub side but small volume and high level at the shroud side. The energy loss in the bulb concentrates on the tapered tail at low flow rates and shifts to the wake area behind the bulb tail at large flow rates. The research results provide reference for the hydraulic performance optimization and high-efficiency and high-stability operation of large-scale pumping stations.

关 键 词：贯流泵 数值模拟 局部熵产 网格尺度 能量损失 可视化 

分 类 号：TH312[机械工程—机械制造及自动化]