沟槽非光滑表面流场的数值分析  

Numerical simulation of turbulent flow over riblet non-smooth surface

作　　者：封云[1] 丛茜[1] 金敬福[1] 张宏涛[1] 任露泉[1] 

机构地区：[1]吉林大学地面机械仿生技术教育部重点实验室

出　　处：《吉林大学学报（工学版）》2006年第S2期103-107,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金："863"国家高技术研究发展计划项目(2003AA305080);国家科技合作重点计划项目(2005DFA008501)

摘　　要：利用有限体积法对三角形仿生非光滑沟槽表面流场进行了数值计算。近壁面区采用B-L两层模型,外区采用雷诺应力模型。分析了沟槽表面的流场特性,对计算域中心Z=3 mm平面的速度场和湍流统计量进行了研究。顶点间距s+≈20,h+≈17.3的沟槽减阻率为5.2%;s+≈40,h+≈34.6的沟槽增阻率为12.3%。从速度场、剪应力及湍流统计三方面对沟槽表面减阻、增阻机理进行了分析讨论。与风洞和油槽实验数据定性对比的结果表明,理论计算与实验结果一致。The numerical simulation of the fully developed turbulent flow over the triangle bionic non-smooth surface were performed by the finite volume analysis to reveal the mechanism of drag effect by the riblets.In the near-wall region the B-L model and outside the region the RSM model were used respectively.The velocities,the shear stresses and the turbulence statistics including vortices in the center of calculation domain Z=3 mm were analyzed.The calculation results showed that the drag is reduced by 5.2% for the riblets with the apex space s^+≈20 and the apex height h^+≈17.3 and increased by 12.3% for those with s^+≈40 and h^+≈34.6,which were in good agreement with the data obtained in the wind tunnel and oil sump.The mechanism of the drag reduction and increase were discussed based on the turbulent flow calculation results.

关 键 词：工程仿生学 仿生非光滑 减阻 沟槽 数值分析 流场 

分 类 号：TB126[理学—工程力学]