沟槽面湍流减阻数值评估方法  

Numerical evaluation method of turbulence drag reduction with riblets

作　　者：周健[1] 欧平[1] 刘沛清[2] 郭昊[2] 

机构地区：[1]中国航天空气动力技术研究院,北京100074 [2]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《航空学报》2017年第4期10-21,共12页Acta Aeronautica et Astronautica Sinica

摘　　要：为解决雷诺平均Navier-Stokes(RANS)方法模拟沟槽面减阻的实际应用问题,受Wilcox对粗糙度模化方法的启发,通过深入分析k-ω剪切应力输运(SST)湍流模型近壁区ω值的作用效果,发现在黏性底层内增加壁面ω值可使对应近壁区的湍动能、湍流黏度、雷诺应力均减小,这种对近壁区流动特性的作用效果与真实沟槽面一致。以经典的对称V型沟槽面(高度=间距)减阻实验数据为基础,通过引入减阻效果影响因子——压力梯度与偏航角,建立复杂流动条件下沟槽面几何尺寸到壁面ω值的模化函数方程,将数值模拟结果与实验结果对比,验证了模化沟槽面可以达到与真实沟槽面相同的减阻效果,并依此给出沟槽面减阻在工程实践中的应用方法,以C919翼身组合体巡航构型为例,完成其沟槽面减阻的总体设计与评估。In order to apply numerical simulation method based on Reynolds-averaged Navier-Stokes（RANS）equations to drag reduction with riblets,inspired by the roughness model-Wilcox and after a deeper study on the effect of the value ofωnear wall in k-ω shear stress transport（SST）turbulence model,it turns out that an increasing of wallωin viscous sublayer leads to a decreasing of turbulent kinetic energy,turbulent viscosity and Reynolds shear stress,which shows the same change as realistic riblets.Based on the classical experimental data of riblets with symmetric V grooves（height=width）,by introducing the effect factors pressure gradients and yaw angle,a modeling function between riblets geometry size and the value of wallωis established in complex flow conditions.Comparing with the experimental data confirms that the modeling riblets can predict the drag reduction as realistic riblets.Besides,a detailed application method of modeling riblets is proposed.At last,an overall design and evaluation of the drag reduction by riblets is given in the case of the C919wing-body combination.

关 键 词：沟槽面 湍流减阻 k-ω剪切应力输运 模化函数 数值模拟 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程] O357.5[理学—流体力学]