应用时间精确自由尾迹方法的旋翼气动特性计算

erodynamic characteristics and responses of rotor with control inputs present complex unsteadiness. A time-accurate free-wake calculation method is developed based upon wake model, PC2B algorithm, blade model, unsteady airfoil model and trim model. Using the developed method, the calculations on rotor inflow for forward flight and thrust coefficient with ramp increase in rotor collective pitch angle for hover are firstly carried out. By comparisons between the calculated results and available experimental data, the capability of the present method is demonstrated. Then, the rotor thrust coefficient, moment coefficient and blade flapping responses with the abrupt increase of collective pitch angle are calculated and analyzed, and some meaningful results are obtained.