摘要
为了进一步研究同心环状缝隙水流特性,通过理论分析推导出环状缝隙流轴向速度的计算公式,得出雷诺数和直径比是影响其大小的主要因素,并结合模型试验研究如何影响,以及其与管道水流速度和圆柱体速度三者之间的关系。结果表明:环状缝隙流轴向速度与雷诺数基本成正比的线性关系,同一直径比时,雷诺数越大,圆柱体速度增大最快,管道水流速度次之,环状缝隙流速增大最慢;直径比在0.5~0.7范围时,缝隙流速最大;雷诺数越大,达到稳定运动状态的直径比越小;直径比越大,达到稳定运动状态的雷诺数越小。因此从缝隙流量和系统稳定运行两个角度综合考虑时,建议选择雷诺数的范围为210 700~245 817,直径比为0.7。
In order to further study the hydraulic characteristics of cyclical slit flow of concentricity,the formula of the axial velocity of cyclical slit flow is deduced through theoretical analysis.It is concluded that Reynolds number and diameter ratio are the main factors that have effect on it.How to influence and the relations among axial velocity of cyclical slit flow,pipe flow velocity and cylinder speed are probed intoby making model experiments.The results show that the axial velocity of cyclical slit flow is approximately linear with Reynolds number.As Reynolds number increases,the cylinder speed increases fastest,pipe flow velocity follows and axial velocity of cyclical slit flow slowest under same diameter ratio.The maximal axial velocity of cyclical slit flow is recorded when diameter ratio ranges from 0.5 to 0.7.The bigger the Reynolds number is,the stabilizing diameter ratio is smaller.The bigger the diameter ratio is,the stabilizing Reynolds number is smaller.Therefore,Reynolds number ranging from 210 700 to 245 817 and choosing the diameter ratio of 0.7 is proposed when two points of the silt flow and the system stable running are considered.
作者
孙蕾
SUN Lei1,2(1.Linfen Water Conservancy Surveying and Design Institute, Linfen 041000, Shanxi Province, China ; 2.College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《中国农村水利水电》
北大核心
2018年第11期175-178,共4页
China Rural Water and Hydropower
基金
国家自然科学基金项目(51109115
51179116)
关键词
环状缝隙流
管道水流
轴向速度
雷诺数
直径比
cyclical slit flow
pipe flow
axial velocity
Reynolds number
diameter ratio
