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Unsteady aerodynamic characteristics investigation of rotor airfoil under variational freestream velocity

机译：自由流速度变化下转子翼型的非定常气动特性研究

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Numerical investigations based on CFD method have been accomplished to illustrate the unsteady aerodynamic characteristics of the SC1095 airfoil under conditions of coupled freestream velocity/pitching oscillation. In order to simulate the variational freestream velocity of airfoil, the moving-embedded grid method is employed to calculate the fluctuating velocity. The unsteady RANS equations coupling with the dual time-stepping approach are chosen as the governing equations to predict flowfield of airfoil under variational freestream velocity condition. The implicit Lower-Upper Symmetric Gauss-Seidel scheme and Spalart-Allmaras turbulence model are employed to improve the calculation efficiency and accuracy, respectively. Based on the present CFD method, the unsteady aerodynamic characteristics of the airfoil with variational freestream velocity are simulated under conditions of fixed angle and variational angle. The simulated results indicate that the peaks of lift coefficient, drag coefficient and pitching moment coefficient of airfoil are enlarged with the increasing of fluctuating velocity, and the start of airflow reattachment process on airfoil is delayed with the increasing of fluctuating velocities and reduced frequencies due to the effects of the airflow hysteresis and compressibility. Additionally, it is illustrated in the case of different phase angles that these peaks would be reduced by increasing phase angle. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：已经完成了基于CFD方法的数值研究，以说明在自由流速度/俯仰振动耦合条件下SC1095机翼的非定常空气动力学特性。为了模拟翼型自由流的变化速度，采用移动嵌入网格法计算脉动速度。选择与双重时步法耦合的非稳态RANS方程作为控制方程，以预测在自由流变化速度条件下的翼型流场。采用隐式上下对称高斯-赛德尔格式和Spalart-Allmaras湍流模型分别提高了计算效率和准确性。基于目前的CFD方法，在固定角和变角条件下，模拟了自由流速度变化的机翼的非定常空气动力学特性。仿真结果表明，随着脉动速度的增大，翼型的升力系数，阻力系数和俯仰力矩系数的峰值增大;随着脉动速度的增大和频率的降低，翼型上气流再附着过程的开始被延迟。气流滞后和可压缩性的影响。另外，示出了在不同的相角的情况下，这些峰值将通过增加相角而减小。 （C）2016 Elsevier Masson SAS。版权所有。

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