基于熵产-涡量的水泵水轮机转轮能量损失特性  

Energy loss characteristics of pump turbine runner based on entropy generation and vorticity

作　　者：李正贵[1] 王冬[1] 李德友[2] 李琪飞[3] LI Zhenggui;WANG Dong;LI Deyou;LI Qifei(Provincial Key Laboratory of Fluid and Mechanical Engineering,Xihua University,Chengdu,Sichuan 610000,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150000,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730000,China)

机构地区：[1]西华大学流体及机械工程省重点实验室,四川成都610000 [2]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150000 [3]兰州理工大学能源与动力工程学院,甘肃兰州730000

出　　处：《排灌机械工程学报》2023年第6期541-548,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(52079118);四川省重点研发计划项目(2020YFSY0029);四川省科技厅项目(2020YFH0135)。

摘　　要：为探究水泵水轮机组因频繁改动活动导叶开度而引起的机组不稳定运行机理,基于熵产理论与涡量理论,采用数值模拟与试验相结合的方法,针对水泵水轮机小流量、高效率和大流量这3种工况开展能量损失特性分析.结果表明:随着活动导叶开度的增加,转轮区域总涡量值增大,高涡量值分布区域及主流区熵产率先减小后增大,壁面熵产率增大;能量损失与流态紊乱程度呈正相关,转轮区域的旋涡流、冲击、摩擦等现象是引起能量损失的重要原因.对相同工况模型进行试验,其结果与数值模拟结果类似,此研究结果为水泵水轮机的设计与效率提升提供了重要依据.To study the unstable operation mechanism of pump turbine induced by the frequent changes in the opening of the active guide vane,based on entropy generation theory and vorticity analysis,the method of combining numerical simulation and experimental tests was adoped to analyze the energy loss characteristics of pump turbine under three different working conditions of low flow,high efficiency and large flow.The research shows that with the increases in the opening of the active guide vane,the vortex value in the runner region increases,the entropy production in the high vortex value distribution region and the main flow region initially decreases and then increases,and the entropy production rate in the wall region increases.Variation law of energy loss is positively correlated with the variation law of flow disorder degree,and the vortex flow as well as impact,friction and other phenomena in the runner region are the important causes of energy loss.The experimental results of the same working condition model are similar to the numerical simulation results,which provides an important basis for the design and efficiency improvement of pump turbines.

关 键 词：水泵水轮机 涡量 熵产 非设计工况 能量损失 

分 类 号：TK734[交通运输工程—轮机工程]