旋翼非定常流场的数值模拟及尺度效应的分析

Unsteady Numerical Simulations of Flow Field of Single Rotor and Analysis of Scale Effect

基于三维非定常可压缩N-S(Navier-Stokes)方程求解,采用滑移网格法等技术,直接模拟旋翼旋转流场。使用0°攻角和8°攻角悬停实验结果,验证了流场网格和数值离散方法的计算精度。对C-T(Caradonna-Tung)旋翼和小型旋翼流场模拟表明:旋翼转速对升力系数均值影响较小,且悬停和垂直下降运动状态改变对旋翼升力系数均值影响不大;在下降状态,C-T旋翼的流场非定常性较强,小型旋翼的流场周期性较好,且随着下降速度增加,小型旋翼升力系数最大值增大。

Based on three-dimensional unsteady compressible N-S（Navier-Stokes） equations and sliding mesh method,the flow field of a single rotor is numerically simulated.Validation of current mesh and numerical method is first carried out concerning two typical cases of the single rotor in hovering state with angle of attack to be fixed at zero degree and eight degrees.The simulation results for C-T rotor and small-scale rotor are investigated comparatively.Rotor angular speed is less important to the average lift coefficient.