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Optimal analysis of rotor arrangement for a micro quadrotor aircraft

DOI：

 作者 单位 E-mail 雷瑶 福州大学 yaolei@fzu.edu.cn 王恒达 福州大学 叶艺强 福州大学 黄宇晖 福州大学

为研究悬停状态下不同翼间距对微型四旋翼飞行器气动性能的影响，结合整机试验和数值模拟分析了不同旋翼间距下微型四旋翼飞行器拉力和功耗的变化规律。在样机试验中，通过搭建试验平台对间距比l/d范围1.1~2.0的微型四旋翼飞行器进行了拉力和功耗的测量，确定了相同功耗条件下具有较大拉力的最佳旋翼间距范围。为更直观地得到旋翼间气动干扰对整机气动性能的影响，通过CFD方法对微型四旋翼飞行器进行了流场仿真，得到了不同间距下的压力分布、流线分布和涡量分布情况，进而对四旋翼飞行器在不同旋翼间距下表现出的不同气动特性从理论上进行分析。结果表明，与无干扰状态下的孤立单旋翼相比，四旋翼间存在的的气动干扰在合适的旋翼间距下可以保持涡流完整，进而有助于提升四旋翼系统的拉力。最后通过试验和仿真对比发现在旋翼间距为1.8d时四旋翼飞行器具有较大的功率载荷和良好的气动特性，是四旋翼飞行器整机最佳的气动布局。

In order to study the influence of aerodynamic performance of micro quadrotor aircraft with different rotor spacing in hover, both the thrust and power of the micro quadrotor aircraft are analyzed with the experimental and numerical simulation results. For the experiments, thrust and power of quadrotor with rotor spacing ratios arranged from 1.1 to 2.0 are measured to try to find out the rotor spacing with the best aerodynamic performance by setting up the test platform with different rotating speed. Additionally, the CFD is applied to obtain the accurate influence of aerodynamic interference between rotors with the pressure distribution, streamline distribution and vorticity distribution. Combined with the experimental results, the reasons for causing different aerodynamic characteristics are analyzed theoretically. Results showed that moderate aerodynamic interference between quadrotor can keep the vortexes intact, so that the thrust can be increased effectively compared with the isolated single rotor. At last, the rotor spacing at 1.8d is proved to be the optimal rotor arrangement with bigger power loading and better aerodynamic characteristics.
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