带沟槽结构的平板流动中的熵产分析  

Entropy Generation Analysis for Grooved Structure Plate Flows

作　　者：刘梅 李曙光[1] 吴正人 王松岭[1] 邓宇涵[1] LIU Mei;LI Shuguang;WU Zhengren;WANG Songling;DENG Yuhan(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment,North China Electric Power University,Baoding,Hebei 011003,China;Department of Economic Management,North China Electric Power University,Baoding,Hebei 071003,China)

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,河北保定071003 [2]华北电力大学经济管理系,河北保定071003

出　　处：《计算物理》2020年第2期182-188,共7页Chinese Journal of Computational Physics

基　　金：河北省自然科学基金(E2016502088);中央高校基本科研业务费专项资金(2015MS111)资助项目。

摘　　要：基于大涡模拟,采用Fluent软件对带沟槽结构的平板流动过程进行熵产分析,探究沟槽结构引起的熵产变化规律.结果表明:沟槽结构能减少流动过程中的熵产,在30 m·s^-1时(Re≈20 000),近壁区总熵产减少约25%, 40 m·s^-1时(Re≈27 000)减少约19%,但其结构对后续流动没有持续性影响,且随着法向高度的增加,影响逐渐变小;熵产在沟槽顶端部分的数值远大于其他区域,湍流作用引起的熵产起主要作用.所得结论为优化沟槽结构减阻提供了理论依据.To investigate entropy generation caused by a grooved structure on flow, we used Fluent software and large eddy simulation(LES) technology to analyze entropy generation in flow over a plate with a grooved structure. It showed that a grooved structure was able to reduce entropy generation in the flow. At 30 m·s^-1(Re≈20 000), total entropy generation in near-wall region decreased by approximately 25%. And at 40 m·s^-1(Re≈27 000), it decreased by approximately 19%. However, the grooved structure did not have a sustained effect on subsequent flow. As distance from the wall in the normal direction increased, the effect decreased gradually. Entropy production at the top of the trench is much greater. And entropy production caused by turbulence is dominant. It provides a theoretical basis for optimizing drag reduction of trench structures.

关 键 词：仿生减阻 沟槽结构 大涡模拟 熵产分析 

分 类 号：O355[理学—流体力学]