排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (3): 242-247    DOI: 10.3969/j.issn.1674-8530.18.0053
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
湍流减阻多级转换特性及湍流特性分析研究
袁益超,朱波,于文汇,詹水清,李昌烽*
江苏大学能源与动力工程学院, 江苏 镇江212013
Analysis on turbulent drag reduction multistage transition and turbulence characteristics in a channel flow
YUAN Yichao, ZHU Bo, YU Wenhui, ZHAN Shuiqing, LI Changfeng*
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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摘要 为了研究在槽道湍流中加入少量高分子聚合物产生减阻后存在一种多级转换现象,将近年来在减阻领域提出的对拉伸高分子自洽的线性等效黏度模型应用于Navier-Stokes方程,并使用雷诺应力方程模型研究高分子湍流减阻效果.数值模拟得出了各减阻程度下的减阻率,为了找出不同减阻区之间的转变点,与文献中直接数值模拟结果进行了对比,验证了模型在该问题上的可行性.对各减阻阶段上常见的湍流特征值如时均速度、雷诺应力、黏性应力、湍流强度进行数值上的比较,并与文献中的试验研究以及直接数值模拟结果进行对比,找出其变化规律,得出湍流在各减阻阶段上流动稳定性方面的特点,以期深化对湍流减阻机理的认识,为湍流流动控制提供参考.
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袁益超
朱波
于文汇
詹水清
李昌烽*
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     
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 is analyzed with the Reynolds stress equation model. The drag reduction percentage and transition points between adjacent drag reduction regimes are identified. The results are compared with direct numerical simulation and the feasibility of the effective viscosity model is validated. The usual turbulence statistics such as mean velocity profile, Reynolds stress, viscous stress and turbulence intensity in different drag reduction stages are discussed against the existing experimental and direct numerical simulation data. The characteristics of flow stability in the drag reduction stages are also clarified. These results can deepen understanding of turbulent drag reduction mechanisms and provide a guide for flow control.
Key wordsdrag reduction   multistage transition   turbulent channel flow   effective viscosity model   turbulence statistics   polymer   
收稿日期: 2018-03-22;
基金资助:国家自然科学基金资助项目(11072091,51576092);江苏省“青蓝工程”资助项目
引用本文:   
袁益超,朱波,于文汇等. 湍流减阻多级转换特性及湍流特性分析研究[J]. 排灌机械工程学报, 2019, 37(3): 242-247.
YUAN Yi-Chao,ZHU Bo,YU Wen-Hui et al. Analysis on turbulent drag reduction multistage transition and turbulence characteristics in a channel flow[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(3): 242-247.
 
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