贯流式水轮机转轮偏心对尾水管涡带的影响  

Effect of Eccentricity of Tubular Turbine Runner on the Vortex Rope in Draft Tube

作　　者：吴延昭 朱迪 陶然[1,2] 魏志聪 肖若富[1,2] WU Yanzhao;ZHU Di;TAO Ran;WEI Zhicong;XIAO Ruofu(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System,China Agricultural University,Beijing 100083,China;College of Engineering,China Agricultural University,Beijing 100083,China;National and Local Joint Laboratory of Fluid Transfer Technology,Zhejiang Sci-tech University,Hangzhou 310018,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]中国农业大学供水管网系统安全节能技术北京工程研究中心,北京100083 [3]中国农业大学工学院,北京100083 [4]浙江理工大学浙江省流体传输技术研究重点实验室,杭州310018

出　　处：《工程热物理学报》2024年第8期2369-2374,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助(No.52079142,No.51909131);水力发电设备国家重点实验室开放基金(No.SKLHE-ORF-202102)。

摘　　要：贯流式水轮机被广泛应用于低水头电站的开发中,由于转轮叶顶间隙的存在,其安装会出现偏心的情况。而转轮对于尾水管涡带的形成与发展具有重要的影响。因此本研究通过数值模拟方法,分析了不同偏心距对涡带涡旋结构和能量耗散的影响。研究结果表明,转轮偏心会对涡带的扩张程度产生明显的影响,但是对涡带的长度影响不大,同时其会破坏尾水管中熵产率高值区的范围和结构,使高值区的中心愈发偏离轴心,造成能量耗散的不稳定。Tubular turbine is widely used in the development of low-head power plants.Due to the presence of clearance at the runner blade tip,their installation may experience eccentricity.The runner has an important influence on the formation and development of draft tube vortex rope.Therefore,this study analyzed the effects of different eccentricities on the vortex structure and energy dissipation through numerical simulation.The results show that the runner eccentricity will significantly influent the vortex rope,but it has little impact on the length of the vortex rope.Meanwhile,runner eccentricities destroy the range and structure of the high entropy production rate area in the draft tube,making the center of the high entropy production rate area increasingly deviate from the axis,causing instability of energy dissipation.

关 键 词：贯流式水轮机 转轮偏心 涡带 熵产率 

分 类 号：TV734[水利工程—水利水电工程]