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本文提出了基于微分-积分方程组求解N-S方程的有限差分法求解不可压缩实际粘性流体绕孤立翼型流动。计算中采用了K-ε湍流模型结合考虑逆压梯度的壁面函数法,并导出任意非正交曲线坐标系下的压力修正方法和适用于大流通量的混合格式。分别计算了层流和湍流情况下带分离翼型绕流,与流动显示及实验数据比较表明,在预测分离点位置,翼型表面压力、平均速度分布、雷诺切应力uv方面,两者吻合,结果是满意的。
In this paper, the finite difference method for solving the N-S equation based on the differential-integral equations is proposed to solve the incompressible actual viscous fluid around isolated airfoils. In the calculation, the K-ε turbulence model was used in combination with the wall function method considering the back pressure gradient, and the pressure correction method in any non-orthogonal curvilinear coordinate system and the mixed format suitable for large flow rates were derived. Computation of laminar and turbulent flows with separate airfoils, respectively, and the flow display and experimental data show that the prediction of the separation point, the airfoil surface pressure, the average velocity distribution, Reynolds shear stress uv, the two coincide, The result is satisfactory.