摘要
利用三维ADV进行光壁石和塑料草加糙后的流速测量,比较加糙后流速、紊动强度和雷诺应力等垂向与横向分布。结果表明:加糙后流速垂向分布呈“J”型,紊动强度略呈“J”型,雷诺应力呈“>”型,且塑料草对水流特性变化的影响较大;相同参数条件下加糙间距、水深越小,流量越大,流速呈“J”型分布越明显、紊动作用也越强、雷诺应力的最大值就越大;随着雷诺数或弗劳德数的增大,糙率逐渐减小,但幅度越来越小,最后趋于稳定。
The velocity of the smooth wall stone and plastic grass after roughening was measured by using threedimensional ADV,and the vertical and transverse distribution of velocity,turbulence intensity and Reynolds stress after roughening were compared.The results show that the vertical distribution of velocity is J-type,turbulence intensity is slightly J-type,Reynolds stress is“>”type,and plastic grass has a great influence on the change of flow characteristics;under the same parameter conditions,the smaller the roughness distance and water depth is,the larger the flow rate,the more obvious the velocity distribution showing“J”type,the stronger the turbulence effect,and the greater the maximum value of Reynolds stress;with the increase of Reynolds number or Froude number,the roughness decreases gradually,but the range becomes smaller and smaller,and finally tends to be stable.
作者
江会昌
吴军君
JIANG Huichang;WU Junjun(Survey and Design Institute of Zhejiang Qiantang River Administration,Hangzhou 310016,Zhejiang,China)
出处
《浙江水利科技》
2021年第3期22-28,共7页
Zhejiang Hydrotechnics
关键词
糙体
流速分布
紊动强度
雷诺应力
水流特性
roughness body
velocity distribution
turbulence intensity
Reynolds stress
flow characteristics
