涵道风扇无人机纵向稳定性研究  

Study on longitudinal stability of ducted fan UAV

作　　者：杨磊[1] 叶正寅[1] 

机构地区：[1]西北工业大学翼型叶栅空气动力学国家重点实验室,陕西西安710072

出　　处：《飞行力学》2013年第2期101-104,109,共5页Flight Dynamics

摘　　要：为了获得涵道风扇无人机的动力学特性,设计了一种以涵道风扇为动力的无人机。采用CFD方法,计算了该无人机在各飞行状态下的气动导数。为了求解其在各飞行状态下的纵向稳定性,对其进行了动力学建模。通过小扰动假设,对运动方程进行了线性化处理,进而计算了其模态特性。研究结果表明,该无人机在各飞行阶段均存在不稳定性,且在垂直起降和过渡阶段尤为突出,需要对发动机转速及升降舵偏角施加控制以保证稳定性要求。最后,对该无人机的纵向不稳定性成因给出了相应的物理解释。该研究可为今后涵道风扇无人机的设计提供一定的参考。A ducted fan UAV is designed to obtain its dynamic properties.The aerodynamic derivatives of the ducted fan UAV in each flight state are computed with the CFD method.In order to study the longitudinal stability of the ducted fan UAV in each flight state,the dynamic model for ducted fan UAV is established and small disturbance and linearization techniques are applied to simplify the equations of motion,and then the mode characteristics are calculated.The results show that the ducted fan UAV is unstable in each flight state and the instability is serious in vertical takeoff stage and the transition stage.The elevator and the engine speed need to be continuously adjusted to guarantee the stability.This paper also tries to explain the physical mechanism of the longitudinal instability of the ducted fan UAV in each flight state,which could provide some references for the ducted fan UAV design.

关 键 词：涵道风扇无人机 垂直起降 纵向稳定性 

分 类 号：V212.1[航空宇航科学与技术—航空宇航推进理论与工程] V279