桨叶实度及轴间距对摆线桨气动特性影响研究
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摘要
悬停状态下,设计参数和摆线桨间距离对摆线桨的气动特性有较大影响。首先通过算例验证滑移网格计算方法应用于摆线桨悬停状态下气动力计算的准确性,然后研究摆线桨在不同半径、弦长和桨叶数时的气动参数特性,最后计算分析不同距离时,摆线桨间的气动干扰特性。结果表明:随着半径增大,桨叶气动力和单位面积上载荷均增大;弦长越大,气动力越大,桨叶单位面积上载荷反而越小;4叶片摆线桨产生的气动力比3叶片和6叶片大,而3叶片的桨叶载荷最大;合力偏转角分别随转速和实度的增大而减小;随着摆线桨间距离的增加,气动力损失系数和合力偏转角均减小。
The accuracy of the Sliding grid calculation method applied to the aerodynamics calculation is verified with an example in hovering, then, the aerodynamic parameters of cyclorotor with different radius, chord and number of blades are studied, and the aerodynamic interfere of cyclorotor with different distances is calculated and analyzed. The results show that with the increase of radius, the aerodynamics and the load per unit area of the blade increase; the larger the chord, the larger the aerodynamics, the smaller the load per unit area of the blade; the aerodynamics generated by the 4-blade cyclorotor is larger than that of 3-blade cyclorotor and 6-blade cyclorotor, while the blade load of 3-blade cyclorotor is the largest; the resultant deflection angle decreases with the increase of the rotational speed and the solidity respectively; with the increase of the distance among the cyclorotors, the aerodynamic loss coefficient and the resultant force deflection angle are decreased.
The accuracy of the Sliding grid calculation method applied to the aerodynamics calculation is verified with an example in hovering, then, the aerodynamic parameters of cyclorotor with different radius, chord and number of blades are studied, and the aerodynamic interfere of cyclorotor with different distances is calculated and analyzed. The results show that with the increase of radius, the aerodynamics and the load per unit area of the blade increase; the larger the chord, the larger the aerodynamics, the smaller the load per unit area of the blade; the aerodynamics generated by the 4-blade cyclorotor is larger than that of 3-blade cyclorotor and 6-blade cyclorotor, while the blade load of 3-blade cyclorotor is the largest; the resultant deflection angle decreases with the increase of the rotational speed and the solidity respectively; with the increase of the distance among the cyclorotors, the aerodynamic loss coefficient and the resultant force deflection angle are decreased.
引文
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[11] 唐继伟.微小型滚翼机的摆线桨设计方法研究[D].西安:西北工业大学,2016.Tang Jiwei.Research on the design of cycloidal propeller for micro cyclocopter[D].Xi’an:Northwest Polytechnical University,2016.(in Chinese)
[2] Jarugumilli T,Lind A,Benedict M,et al.Experimental and computational flow field studies of a MAV-scale cycloidal rotor in forward flight[C]//American Helicopter Society 69th Annual Forum.Phoenix AZ,2013.
[3] Min S Y,Lee C H,Seung M H,et al.Experimental study of a quadrotor cyclocopter[J].Journal of the American He-licopter Society,2015,60(3):1-10.
[4] Benedict M,Jarugumilli T,Chopra I.Effectof rotor geo-metry and blade kinematics on cycloidal rotor hover performance[J].Journal of Aircraft,2013,50(5):1340-1352.
[5] Kim S J,Yun C Y,Kim D,et al.Design and performance tests of cycloidal propulsion systems[C]//44 th AIAA/ASME/ASCE/AHS/ASC Structures,Structural Dynamics,and Materials Conference.[S.l.]:AIAA,2003:1786-1792.
[6] 唐继伟,胡峪,宋笔锋.关键设计参数对摆线桨气动性能影响[J].航空动力学报,2015,30(2):297-305.Tang Jiwei,Hu Yu,Song Bifeng.The influence of key design parameters on the aerodynamic performance of cycloidal rotors[J].Journal of Aerospace Power,2015,30(2):297-305.(in Chinese)
[7] Benedict M,Ramasamy M,Chopra I,et al.Performance of a cycloidal rotor concept for micro air vehicle applications[J].Journal of the American Helicopter Society,2010,55(2):22002-22002.
[8] Hu Y,Du F,Zhang H L.Investigation of unsteady aerodynamics effects in cycloidal rotor using RANS solver[J].The Aeronautica Journal,2016,120(1228):956-970.
[9] Xisto C,Leger J,Páscoa J,et al.Parametric analysis of a large scale cycloidal rotor in hovering conditions[J].Journal of Aerospace Engineering,2017,30(1):1-4.
[10] Sirohi J,Parsons E,Chopra I.Hover Performance of a cycloidal rotor for a micro air vehicle[J].Journal of the American Helicopter Society,2007,52(3):263-279
[11] 唐继伟.微小型滚翼机的摆线桨设计方法研究[D].西安:西北工业大学,2016.Tang Jiwei.Research on the design of cycloidal propeller for micro cyclocopter[D].Xi’an:Northwest Polytechnical University,2016.(in Chinese)