摘要
在扬程几乎为零的平原小河道中,传统水泵存在运行效率低、稳定性差、架设成本高等问题。为提升平原小河道的水动力条件,提出了利用扑动水翼推动小河道水体流动的方法。并由此建立了扑动水翼的计算模型,针对不同扑动频率以及不同来流速度对扑动水翼推水性能的影响进行了数值模拟研究。设计了扑动水翼推水性能试验平台,在循环流道内进行了试验验证。结果表明:扑动水翼装置的流量与其扑动频率成正比,扬程与扑动频率的平方成正比。在固定频率下,扑动水翼的尾涡随着流速的增加从混沌状态逐渐形成双列反卡门涡街,装置泵水效率逐渐增加,直至最佳效率点;流速继续增加,反卡门涡街转变为单列,效率迅速下降。此外,扑动水翼装置具有扬程低、流量大等优点,在平原河流推水上具有优势。
In the small plain river with almost zero head,the traditional water pumps are faced with a series of problems,such as low efficiency,poor stability and high erection cost.In order to improve the hydrodynamic conditions of small plain rivers,an innovative method of using flapping hydrofoil to promote the flow of water in small rivers was proposed.Based upon this,the calculation model of flapping hydrofoil was established,and the effects of different flapping frequencies and different incoming flow velocities on the hydrodynamic performance of flapping hydrofoil were numerically simulated.A test bench for the hydrodynamic performance of flapping hydrofoil was designed and verified in the circulating channel.The results showed that the flow of flapping hydrofoil device was directly proportional to its flutter frequency,and the head was directly proportional to the square of frequency.At a fixed frequency,the tail vortex of flapping hydrofoil gradually formed a double row anti-Karmen vortex street from the chaotic state with the increase of velocity,and the pumping efficiency of the device gradually increased to the optimal efficiency point.The flow velocity continued to increase,the anti-Karmen vortex street changed to a single row,and the efficiency decreased rapidly.In addition,the flapping hydrofoil device had the advantages of low head and large flow,and had unique advantages in pushing water in plain rivers.
作者
华尔天
陈万前
汤守伟
谢荣盛
郭晓梅
徐高欢
HUA Ertian;CHEN Wanqian;TANG Shouwei;XIE Rongsheng;GUO Xiaomei;XU Gaohuan(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhejiang Engineering Research Center for Advanced Hydraulic Equipment,Hangzhou 310018,China;School of Mechanical and Automotive Engineering,Zhejiang University of Water Resources and Electric Power,Hangzhou 310018,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2022年第8期154-162,共9页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(51976202、61772469)
浙江省省级重点研发计划项目(2021C03019)
浙江省农村水利水电资源配置与调控关键技术重点实验室开放基金项目(UZJWEU-RWM-20200304B)
关键词
扑动水翼
水动力性能
数值模拟
试验验证
flapping hydrofoil
hydrodynamic performance
numerical simulation
test verification
作者简介
华尔天(1963—),男,教授,博士生导师,主要从事机构设计、进化设计和概念设计研究,E-mail:het@zjut.edu.cn
