长江科学院院报2017，Vol.34Issue(6)：67-71,5.DOI:10.11988/ckyyb.20160262
明渠恒定均匀流机械能损失构成分析
Constitution of Mechanical Energy Loss of Steady Uniform Flow in Open Channel
摘要
Abstract
The calculation of mechanical energy loss of flow in open channel is an important part both in hydraulic and fluid mechanics.In this paper the mechanical energy loss is obtained based on the viscous fluid model and the equationof total flow of constant homogeneous incompressible fluid in open channel.The constitutions of mechanical energy loss and their mutual transformation are revealed.Result shows that the mechanical energy loss are resulted from time-averaged velocity gradient and dissipation of turbulent kinetic energy.When the Reynolds number is small,the time-averaged velocity gradient is the main cause of mechanical energy loss;whereas when the Reynolds number is large,the dissipation of turbulent kinetic energy is a major contributor.In conclusion,in shallow and wide open shallow with a Reynolds number of 9.5×103,the mechanical loss caused by time-averaged velocity gradient is equal to that caused by kinetic energy dissipation.关键词
矩形明渠/恒定均匀流/机械能损失构成/流体力学/紊动能耗散/时匀流速梯度Key words
rectangular open channels/uniform steady flow/constitution of mechanical energy loss/fluid mechanics/dissipation of kinetic energy/time-averaged velocity gradient分类
建筑与水利引用本文复制引用
范敏,朱远乐,江耀祖,王智娟..明渠恒定均匀流机械能损失构成分析[J].长江科学院院报,2017,34(6):67-71,5.基金项目
国家重点研发计划项目(2016YFC0402004) （2016YFC0402004）
重庆交通大学内河航道整治技术交通行业重点实验室开放基金项目(NHHD-201507) （NHHD-201507）
