基于涡分析的旋涡泵内流动能量转换特性研究  

Energy Conversion Characteristics of Flow in Vortex Pump Based on Vortex Analysis

作　　者：杨伟峰 张人会[1,2] 杨鸿德 陈学炳 YANG Weifeng;ZHANG Renhui;YANG Hongde;CHEN Xuebing(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)

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

出　　处：《农业机械学报》2024年第5期167-175,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：甘肃省优秀博士生项目(22JR5RA236);国家自然科学基金项目(51979135);甘肃省重点研发计划项目(21YF5GA077);甘肃省教育厅双一流重点项目(057047)。

摘　　要：为研究旋涡泵内复杂的旋涡特征,量化泵内旋涡体积和强度,分析旋涡结构对能量转换和能量损失的影响规律,采用非定常数值模拟和外特性实验相结合的方法对单级旋涡泵进行分析,综合使用Ω方法和Liutex方法对泵内旋涡进行识别和强度表征,提出平均旋涡强度进行量化研究,并结合动能方程的涡动力学分解式以及涡量分解理论进行分析。结果表明:泵内的旋涡充分发展区域存在螺旋形的管状旋涡结构,该旋涡从叶轮流道流出进入侧流道,并且随着流量的增大,涡管数量减少且旋涡强度降低;流量的增大使得叶轮内的旋涡体积和强度减小,而其在侧流道内相对变化较小,相同工况时叶轮内的平均旋涡强度远大于侧流道内;压力梯度对流体动能转换的贡献最大,旋涡结构引起的动量输运和耗散损失占比较小,但刚性涡量即旋涡结构的强度与动量输运呈正相关,变形涡量则与拟涡能损失相关性较强。With the aim to study the characteristics of complex vortices in the vortex pump,quantify the volume and intensity of vortices in pump,and analyze the influence of vortex structure on energy conversion and energy loss,the unsteady numerical simulation and external characteristic experiments were carried out to analyze the single-stage vortex pump,the Ω method,and Liutex method were used to identify and characterize the intensity of vortex in the pump,the average vortex intensity was proposed for the quantitative study,and the analysis was carried out by combining the vortex dynamics decomposition formula of kinetic energy equation and the vortex decomposition theory.The results showed that there was a spiral vortex structure in the fully developed vortex region of the pump,which flowed out from the impeller channel into the side channel.With the increase of flow rate,the number of vortex tubes was decreased and the vortex strength was decreased.With the increase of flow rate,the volume and intensity of the vortex in the impeller was decreased,while the relative change in the side channel was relatively small.The average vortex intensity in the impeller was much greater than that in the side channel under the same working conditions.Pressure gradient contributed the most to the kinetic energy conversion of fluid,and the proportion of momentum transport and dissipation loss caused by vortex structure was small,but the rigid vorticity,that was,the strength of vortex structure,was positively related to momentum transport,while the deformed vorticity was strongly related to the energy loss of enstrophy.

关 键 词：旋涡泵 旋涡 Ω方法 Liutex方法 拟涡能 

分 类 号：TH314[机械工程—机械制造及自动化]