三角形微沟槽壁面湍流减阻的数值研究  

Numerical Study on Turbulent Drag Reduction on Triangular Micro-groove Wall

作　　者：李茂林 张浩[1,2] 玄克勇 张志 石若冉 LI Maolin;ZHANG Hao;XUAN Keyong;ZHANG Zhi;SHI Ruoran

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]山东省绿色建筑协同创新中心,山东济南250101 [3]山东林李建筑设计有限公司,山东济南250014

出　　处：《煤气与热力》2023年第3期18-24,共7页Gas & Heat

基　　金：山东省专业学位研究生教学案例库项目(SDYAL20162);山东省研究生优质课程建设项目(SDYKC19117)。

摘　　要：针对三角形微沟槽壁面的流动减阻问题,应用RNG k-ε湍流模型对近壁处湍流进行描述,研究不同来流速度与雷诺数对微沟槽减阻效果的影响,分析微沟槽壁面与光滑壁面的速度场、湍动能、壁面切应力的特征。结果表明:所设计微沟槽结构减阻率随来流速度及雷诺数增加先增大后减小,减阻率最大达到10.23%。减阻主要原因为:相对于光滑壁面,微沟槽壁面近壁处形成低流速带,起到缓冲层的作用;微沟槽特殊形状抑制了展向流的发展,且槽谷内部壁面切应力相对较小。To solve the problem of flow drag reduction on triangular micro-groove wall, RNG k-ε turbulence model is applied to describe the turbulence near the wall. The influence of different flow velocities and Reynolds numbers on the drag reduction effect of micro-groove are studied, and the characteristics of velocity field, turbulent kinetic energy and wall shear stress of micro-groove wall and smooth wall are analyzed. The results show that the drag reduction rate of the designed micro-groove structure increases first and then decreases with the increase of the flow velocity and Reynolds number, and the maximum drag reduction rate reaches 10.23%. The main reasons for drag reduction are: compared with the smooth wall, a low velocity zone is formed near the wall of the micro-groove, which acts as a buffer layer. The special shape of micro-groove inhibits the development of spanwise flow, and the stress on the inner wall of the groove is relatively small.

关 键 词：微沟槽 湍流减阻 壁面切应力 数值模拟 

分 类 号：O352[理学—流体力学]