Numerical simulation of helicopter slung-load flow field and fins design
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摘要: 根据已知的直升机吊挂的几何尺寸,利用CAD软件建立了两种吊挂的三维模型.利用图像测绘的方法对第1种吊挂尾鳍进行了初步设计,通过计算流体力学(CFD,Computational Fluid Dynamics)方法对带尾鳍的吊挂模型进行了计算与分析,气动力计算结果与理论计算结果吻合较好.此外,对第2种UH-60黑鹰直升机带尾鳍吊挂进行了CFD计算,考察了尾鳍对吊挂流场的影响.通过对两种带尾鳍的直升机吊挂情况的计算分析,证明了尾鳍对保证吊挂在飞行过程中的航向稳定性具有关键的作用,进而提出了一种基于无空气阻尼力假设的直升机吊挂尾鳍尺寸的设计方法,并对第2种吊挂状态下的尾鳍尺寸进行了计算设计.计算所得到的尾鳍面积对航向稳定性的影响结果与国外风洞实验结果保持一致.Abstract: Tow 3D slung-load models of helicopter were built by the CAD software according to the known geometry data. Fins of the first slung-load were designed with the method of mapping pictures. Through methods of computational fluid dynamics(CFD), the slung-load with fins was calculated and analyzed, and the result of aerodynamic resistance between CFD methods and theory methods had good agreement. Moreover, the second slung-load with fins of UH-60 Black Hawk helicopter was calculated through CFD methods, and the flow field interaction between fins and slung-load was investigated. By the calculation of two cases, fins were proved for ensuring the directional stability of slung-load crucially in flight. Then a design method of slung-load fins based on hypothesis of ignoring air damping force was presented, and the second slung-load fins were designed through the method. The impacts of fins on the directional stability of slung-load were consistent with the wind tunnel tests.
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Key words:
- helicopter /
- slung-load /
- computational fluid dynamics(CFD) /
- fin /
- directional stability
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[1] Cliff E,Bailey D.Dynamic stability of a translating vehicle with a simple sling load [J].Journal of Aircraft,1975(12):773-777 [2] Nagabhushan B.Low-speed stability characteristics of a helicopter with a sling load [J].Vertica,1985,9(4):345-361 [3] Stuckey R A.Mathematical modeling of helicopter slung load .DSTO-TR-1257,2001 [4] 孙传伟,徐进.带大载荷吊挂直升机悬停纵向操纵性分析[J].南京航空航天大学学报,2005,37(4):421-425 Sun Chuanwei,Xu Jin.Longitudinal control characteristic analysis of heavy slung-load helicopter [J].Journal of Nanjing University of Aeronautics and Astronautics,2005,37(4):421-425(in Chinese) [5] 崔利,曹义华,李国知.直升机吊挂飞行平衡、稳定性与操纵性研究[J].航空动力学报,2010,25(10):2307-2311 Cui Li,Cao Yihua,Li Guozhi.Studies on trims,stability,and controllability of helicopter with slung-load [J].Journal of Aerospace Power,2010,25(10):2307-2311(in Chinese) [6] Matheson N.The stability of portable bridges carried on slings beneath helicopter[M].Melbourne,Victoria:Defense Technical Information Center,1980 [7] Raz R,Rosen A,Carmeli A,et al.Wind tunnel and flight evaluation of passive stabilization of a cargo container slung load [J].Journal of the American Helicopter Society,2010,55(3):032001-1-032001-18 [8] Hoerner S F.Fluid-dynamic drag:practical information on aerodynamic drag and hydrodynamic resistance [M].NJ:Midland Park,1965 [9] Cicolani L S,da Silva J G A,Duque E P N,et al.Unsteady aerodynamic model of a cargo container for slung-load simulation [J].The Aeronautical Journal,2004,108(1085):357-368 -
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