适合机动飞行的旋翼气动模型研究

Study of aerodynamic model for the maneuvering rotor

为改善对旋翼空气动力他轴响应的预测,在旋翼气动模型中引入时变的尾迹弯曲参数KR,以体现机动旋翼的尾迹畸变效应.与已有方法相比,该模型的计算结果更为接近实验数据.还建立了动态尾迹畸变模型,并分析了计入尾迹收缩效应的必要性.结果表明,为了正确计算机动飞行中的旋翼气动力,特别是操纵的他轴响应,应当在模型中采用随状态变化的尾迹弯曲参数KR.

To improve the prediction of the rotor＇s off-axis aerodynamic response, the wake distortion effect of maneuvering rotor was studied with the introduction of time-accurate wake curvature parameter （KR） into the maneuvering rotor model. As compared with existing approaches, the computed results from this model are more close to the test data. Besides, a dynamic wake distortion model was constructed, while the necessity of incorporating the wake contraction effect was analyzed. The research results show that： the operatingstate-dependent （KR） shall be applied to aerodynamic models in order to calculate accurately the rotor aerodynamic forces and moments, especially for off-axis response.