三角肋条大涡模拟与减阻机理研究  

Study on Large Eddy Simulation and Drag Reduction Mechanism of Triangular Riblets

作　　者：王静 王卫强[1] 王国付[1] 张明明[2] 李雪松[3] WANG Jing;WANG Wei-Qiang;WANG Guo-Fu;ZHANG Ming-Ming;LI Xue-Song(College of Petroleum Engineering,Liaoning University of Petroleum&Chemical Technology,Fushun 113001,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100080,China;Department of Thermal Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,抚顺113001 [2]中国科学院工程热物理研究所,北京100080 [3]清华大学能源与动力工程系,北京100084

出　　处：《工程热物理学报》2020年第4期877-883,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点基金(No.51736008);国家科技重大专项(No.2017-II-0007)。

摘　　要：已有实验表明三角肋条具有较好的表面减阻效果,但雷诺时均湍流模型难以模拟与揭示肋条减阻机理。本文采用大涡模拟(LES)对下壁面安装肋条的槽道流进行模拟,通过减阻率与实验值的对比以及平均速度剖面和脉动速度均方根等与直接数值模拟(DNS)结果的对比确认本文计算的准确性。根据计算的流场细节分析表明:肋条通过增加近壁区的边界层厚度,抑制流向涡的发展,减少近壁活动,使得近肋条壁面的剪切力比平板的剪切力小而获得减阻。Experiments have shown that the triangular riblets have a good effect on surface drag reduction,but it is difficult to simulate and reveal the mechanism of riblets drag reduction by Reynolds averaged turbulence model.In this paper,large eddy simulation(LES)was used to simulate the channel flow with riblets which installed on the lower wall.The accuracy of the calculation in this paper was confirmed by the comparison between the calculated drag reduction rate and the experimental value,as well as the comparison of the mean velocity profile and the RMS velocity with the direct numerical simulation(DNS)results.According to the detailed analysis of the calculated flow field,it is shown that the shear force near the riblets wall is smaller than that of the plate,and the drag reduction is achieved by increasing the thickness of the boundary layer in the near-wall area,inhibiting the development of the streamwise vortex and reducing the near-wall activity.

关 键 词：三角肋条 减阻 大涡模拟 湍流结构 

分 类 号：TK123[动力工程及工程热物理—工程热物理]