UNSTEADY AERODYNAMIC MODEL OF ISOLATED ROTORIN LARGE-AMPLITUDE MANEUVERS  

大机动飞行中孤立旋翼的非定常空气动力模型(英文)

作　　者：徐进[1] 高正[1] 岳海龙[1] 

机构地区：[1]南京航空航天大学航空宇航学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2008年第1期1-10,共10页南京航空航天大学学报（英文版）

摘　　要：To improve the rotor off-axis response prediction, aerodynamic models must include the wake distortion effects of the maneuvering rotor. And the crux of the matter is to obtain a precise wake curvature parameter KR. A Peters-He finite-state wake model is improved to incorporate the operating-state-dependent KR to embody maneuver-induced effects. The curvature parameter KR varies with rotor forward speed, thrust and maneuvering angular rate according to a smoking experiment. Moreover, aerodynamic force/moment experiment indicates that after a quasi-step angular input, both on-axis and off-axis rotor responses show that an overshoot and its amplitude increases with the pitching rate. The comparison between theoretical and experimental results shows that the operating-state-accurate curvature parameter must be adopted to obtain accurate aerodynamic forces/moments, especially for the off-axis response. Additionally, combined with a dynamic wake distortion model, the obtained correlation agrees well with experimental data.为提高旋翼他轴响应的预测,气动模型应当计入机动旋翼的尾迹畸变效应,而准确表示尾迹弯曲参数KR是关键。为表达机动导致的各种效应,增广Peters-He有限状态尾迹模型可以吸收随飞行状态变化的KR值。根据烟流实验,该参数随旋翼前飞速度、拉力和机动角速率而变化。旋翼的空气动力实验表明,旋翼轴接受准阶跃输入后,同轴及他轴的空气动力响应有过冲,且俯仰速率愈大,过冲幅值愈大。理论和实验结果的对比显示,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,应在模型中采用随状态变化的尾迹弯曲参数KR。此外,在当前模型基础上联合动态尾迹畸变模型,计算出的旋翼力和力矩更接近试验数据。

关 键 词：MANEUVERABILITY WAKES flight aerodynamics dynamic inflow off-axis response 

分 类 号：V212.4[航空宇航科学与技术—航空宇航推进理论与工程] V249.1