论文部分内容阅读
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 solve the practical application of Raynaud’s average Navier-Stokes (RANS) method to simulate the drag reduction of groove surface, inspired by Wilcox’s method of roughness modeling, the k-ω shear stress transport (SST) turbulence model It is found that increasing the wall ω value in the viscoelastic layer can reduce the turbulent kinetic energy, turbulent viscosity and Reynolds stress of the corresponding near wall, and the effect and the real effect on the flow characteristics in the near wall The same groove surface. Based on the experimental data of the drag reduction of the classic symmetrical V-groove surface (height = spacing), by introducing the influence factors of drag reduction effect-pressure gradient and yaw angle, the geometrical dimensions of the groove surface under complicated flow conditions are established to the wall ω Value of the modular function equation, the numerical simulation results and experimental results show that the modeled groove surface can achieve the same with the actual groove surface drag reduction effect, and in accordance with this groove surface drag reduction in engineering practice The overall design and evaluation of the drag reduction of the groove surface is completed by taking the cruise configuration of the C919 wing body assembly as an example.