利用螺旋桨动力配平的飞翼布局无人机
首发时间:2012-12-10
摘要:提出了采用螺旋桨动力参与纵向配平的飞翼布局无人机。提出的飞翼布局无人机使用正弯度翼型改善升阻特性,利用外洗和螺旋桨动力实现无人机纵向配平。利用CMARC软件和粘性阻力修正进行气动力计算和稳定性分析,在失速范围内,其计算结果与风洞试验结果吻合较好。考虑到不同任务段功率需求不同,融入了动力系统计算模型。基于遗传算法对有无动力配平的飞翼布局无人机总体参数进行了优化。优化与参数分析结果表明:采用螺旋桨动力配平减小了采用正弯度翼型飞翼布局无人机的后掠角和外洗,改善无人机展向升力分布,从而提高无人机升阻比,最终提升了无人机航时,减小了无人机重量和尺寸。
关键词: 电动无人机 飞翼布局 动力配平 遗传算法 总体参数设计
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A Flying Wing Configuration UAV Trimmed Longitudinally With Propeller Thrust
Abstract:A new aerodynamics configuration which use the propeller thrust to trim the flying wing is proposed. In this configuration, the positive cambered airfoil is used to replace the conventional reflex cambered airfoil in order to improve the lift to drag ratio and maximum lift available. The UAV is trimmed by wash out and propeller thrust. The aerodynamics forces are computed from commercial software CMARC and empirical formulation. Good agreements are obtained with the results from wind tunnel experiments. To guaranty the fidelity of the analysis, the propulsion system mathematic model is involved into the analysis. The genetic algorithm is used to optimize the performance of the UAV and the sensitivity analysis is performed. From the analysis, it is found that with the help of propeller thrust, the wash out and sweepback can be reduced. This will improve the lift to drag ratio and reduce UAV weight. So the endurance of the UAV will be increased and size of the UAV can be reduced.
Keywords: electric-powered UAV flying wing propeller thrust trim genetic algorithm configuration parameter design
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