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Entropy generation rates calculation in turbulent flow through an airfoil based on eddy viscosity models[J].计算力学学报,2018,35(3):387~392

Entropy generation rates calculation in turbulent flow through an airfoil based on eddy viscosity models
Entropy generation rates calculation in turbulent flow through an airfoil based on eddy viscosity models

DOI：10.7511/jslx20170227003

 作者 单位 王威 华中科技大学 能源与动力工程学院, 武汉 430074 王军 华中科技大学 能源与动力工程学院, 武汉 430074 李佳峻 华中科技大学 能源与动力工程学院, 武汉 430074 梁钟 华中科技大学 能源与动力工程学院, 武汉 430074

利用有限体积法实现了基于非正交同位网格的SIMPLE算法。基于熵分析方法，采用涡粘性模型求解湍流熵产方程，系统研究了湍流模型对二维翼型绕流流场熵产率的影响。通过计算NACA0012翼型在来流雷诺数为2.88×106时，0°攻角~16.5°攻角范围内的翼型表面压力系数分布和升阻力特性，验证了算法及程序的正确性。结果表明，选择不同湍流模型时，翼型流场熵产的计算结果存在差异，湍流耗散是引起流场熵产的主要原因；翼型流场的熵产主要发生在翼型前缘区、壁面边界层和翼型尾流区域，流场熵产率与翼型阻力系数线性相关；当产生分离涡时，粘性耗散引起的熵产下降。

The SIMPLE algorithm was achieved based on non-orthogonal collocated grid by using FVM.Based on entropy analysis method, the influence of turbulence model using eddy viscosity model on the entropy generation rate of the flow field around a two-dimensional airfoil was studied.The accuracy of the algorithm and programs was assessed by simulating the pressure coefficient distribution, lift coefficient and drag coefficient of NACA0012 airfoil under Reynolds number of 2.88×106 and attack angle from 0° to 16.5°.It is found that the entropy generation rate in the airfoil flow field varies with different turbulence models, which is mainly caused by turbulent dissipation.The entropy generation of airfoil flow field mainly occurs in the frontal zone, the wall boundary layer zone and the wake region.The drag coefficient of the airfoil and entropy generation rates in the flow field can be related by linear equation.The entropy generation rates caused by viscous dissipation decrease when the separation vortex appears.