排灌机械工程学报2019，Vol.37Issue(3)：242-247,6.DOI:10.3969/j.issn.1674-8530.18.0053
湍流减阻多级转换特性及湍流特性分析
Analysis on turbulent drag reduction multistage transition and turbulence characteristics in a channel flow
摘要
Abstract
To identify drag reduction and phenomenon of multistage transition caused form addition of a minute amount of polymer in turbulent channel flows, a self-consistent linear effective viscosity model for stretching polymer was applied into the Navier-Stocks equations, and then polymer additive drag reduction effect was analyzed with the Reynolds stress equation model. The drag reduction percentage and transition points between adjacent drag reduction regimes were identified. The results were compared with direct numerical simulation and the feasibility of the effective viscosity model was validated.The usual turbulence statistics such as mean velocity profile, Reynolds stress, viscous stress and turbulence intensity in different drag reduction stages were discussed against the existing experimental and direct numerical simulation data. The characteristics of flow stability in the drag reduction stages were also clarified. These results can deepen understanding of turbulent drag reduction mechanisms and provide a guide for flow control.关键词
减阻/多级转换/槽道湍流/等效黏度模型/湍流统计量/聚合物Key words
drag reduction/multistage transition/turbulent channel flow/effective viscosity model/turbulence statistics/polymer分类
农业科技引用本文复制引用
袁益超,朱波,于文汇,詹水清,李昌烽..湍流减阻多级转换特性及湍流特性分析[J].排灌机械工程学报,2019,37(3):242-247,6.基金项目
国家自然科学基金资助项目(11072091,51576092) （11072091,51576092）
江苏省"青蓝工程"资助项目 （）
