黏性耗散对壁面热流的贡献  

Contribution of Viscous Dissipation to Wall Heat Flux

作　　者：张朋 宋余滨 夏振华 Zhang Peng;Song Yubin;Xia Zhenhua(Department of Engineering Mechanics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学航空航天学院流体工程研究所,浙江杭州310027

出　　处：《气动研究与试验》2024年第5期75-80,共6页Aerodynamic Research & Experiment

摘　　要：壁面的热流贡献可以被分解为湍流传热部分的贡献、分子传热部分的贡献、压力功部分的贡献和黏性应力功部分的贡献(VW) 4部分。本文首先在低马赫数Ma 0.3 (近似不可压缩流动)和中等马赫数Ma 1.5的可压缩槽道湍流中对该分解公式进行了进一步验证,所得结果和壁面直接计算的热流符合得很好。在此基础上,进一步将脉动场黏性应力功的贡献VWf分解为螺旋耗散、膨胀耗散以及脉动密度相关项耗散,发现脉动场部分的贡献主要是螺旋耗散项。数值结果显示,在低马赫数下,黏性应力功部分依然是壁面热流的主要贡献项。The wall heat flux is decomposed into four parts,including the contribution from the turbulent heat transfer,the contribution from the molecular heat transfer,the contribution from the pressure work,and the contribution from the work from viscous stress(VW).The paper first validated the decomposition in compressible flow at Ma 0.3(approximately incompressible flow)and Ma 1.5,and the results are in good agreement with the heat flux directly calculated on the wall.Moreover,the contribution to the fluctuating viscous stress(VWf)can be further decomposed into solenoidal dissipation,dilatational dissipation and fluctuation density correlation related dissipation.It is found that the main contribution to the fluctuating field is the solenoidal dissipation term.At low Mach number,the results also show that the viscous work is still the main contribution term to the wall heat flux,although the mean velocity is quite close to the results from the incompressible case.

关 键 词：壁面热流 可压缩槽道湍流 黏性耗散 低马赫数 

分 类 号：O354.7[理学—流体力学]