考虑弹性转轴的扑翼三维气动数值计算

张云飞; 叶正寅

考虑弹性转轴的扑翼三维气动数值计算

西北工业大学航空学院翼型、叶栅空气动力学国家级科技重点实验室,西安 710072

基金项目: 预先研究基金

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出版历程
- 收稿日期: 2010-03-22
- 修回日期: 2010-07-01
- 刊出日期: 2011-04-28

Three-dimensional Navier-Stokes simulation of flapping wing with pitching elasticity

National Key Laboratory of Science and Technology on Aerodynamic Design and Research, School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China

摘要

摘要: 通过求解雷诺平均Navier-Stokes方程,研究了同时具有扑动和俯仰运动的三维扑翼气动特性.为了模拟扑翼的弹性特性,在扑翼俯仰轴处设计了扭簧.研究了扑翼平面形状、俯仰弹性轴与质心的相对位置、俯仰刚度变化等参数的影响.结果表明:俯仰角相对扑动角有一个大的相位超前量,且刚度系数越大该超前量越大;考虑了俯仰弹性特征后,计算得到的平均阻力系数减小了60％左右,且升力系数幅值和绕翼根力矩系数的幅值明显减小,而这是判断微型飞行器能否平稳飞行的关键参数.所以,在设计扑翼飞行器时应当考虑其扑翼的俯仰弹性特性,适当设计扑翼的俯仰刚度和俯仰轴的位置对扑翼的空气动力性能至关重要.
- 扑翼 /
- 微型飞行器 /
- 俯仰弹性 /
- 数值模拟 /
- 扑翼运动模型
Abstract: The aerodynamic characteristics of a flapping wing with movements of flapping and pitching were investigated by solving unsteady Reynolds-averaged Navier-Stokes equations.A torque spring on pitch axis was used to simulate the pitching elasticity of bird wings.The influences of the platform of flapping wing,the location of gravity center relative to the pitch axis and the torque spring constant on aerodynamic performances were investigated.The results indicate that there would be a large leading phase between the movements of pitching and plunging.The larger spring constant means greater phase difference.After taking the pitching elasticity into consideration,the amplitude of the lift coefficient and that of bending moment at the root of the wing decreased,contributing much to the steady flight of micro air vehicles.Simultaneously the average drag coefficient was reduced by about 60%.Therefore the pitching stiffness and the location of the pitch axis affect the aerodynamic performance a lot and it's very important to consider the pitching elasticity in flapping wing design.
- flapping wing /
- micro air vehicle /
- pitching elasticity /

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参考文献(23)

[1]	曾锐.仿鸟微型扑翼飞行器的气动特性研究 .南京:南京航空航天大学,2004. ZENG Rui.Aerodynamic characteristics of flapping-wing MAV simulating bird flight .Nanjing:Nanjing University of Aeronautics and Astronautics,2004.(in Chinese)
[2]	Azuma A.The biokinetics of flying and swimming[M].The United States:American Institute of Aeronautics and Astronautics,Inc.,2006.
[3]	Knoller R N.Die gesetze des luftwiderstandes[J].Flug-und Motortechnik(Wien),1909,3(21):1-7.
[4]	Betz A.Ein beitrag zur erklrung dessegelfluge[J].Zeitschrift für Flugtechnik und Motorluftschiffart,1912,3(1):269-272.
[5]	Von Kármán T,Burgers J M.General aerodynamic theory-perfect fluids[M]//Durand W F.Aerodynamic Theory:VolumeⅡ.Berlin:Julius Springer,1934.
[6]	Garrick I E.Propulsion of a flapping and oscillating airfoil .The United States:NACA Report No.567,1936.
[7]	Ashraf M A,Lai J C S,Young J.Numerical analysis of flapping wing aerodynamics .Australia:16th Australasian Fluid Mechanics Conference,2007.
[8]	Tuncer I S,Platzer M F.Computational study of flapping airfoil aerodynamics[J].Journal of Aircraft,2000,37(3):514-520.
[9]	Young J,Lai J C S.Oscillation frequency and amplitude effects on the wake of a plunging airfoil[J].AIAA Journal,2004,42(10):2042-2052.
[10]	谢辉,宋文萍,宋笔锋.微型扑翼绕流的N-S方程数值模拟[J].西北工业大学学报,2008,26(1):104-109. XIE Hui,SONG Wenping,SONG Bifeng.Numerical solution of Navier-Stokes equations for flow over a flapping wing[J].Journal of Northwestern Polytechnical University,2008,26(1):104-109.(in Chinese)
[11]	Lin S Y,Hu J J.Numerical study of flapping wing .AIAA 2003-3448,2003.
[12]	YANG Wenqing,SONG Bifeng,SONG Wenping.Numerical simulation of 3D flapping wing based on chimera method .Alaska,American:The 26th International Congress of Aeronautic Sciences,2008.
[13]	谢飞.低马赫数非定常流动数值模拟及应用 .西安:西北工业大学,2009. XIE Fei.Numerical simulation and applications of unsteady flow in low Mach .Xi'an:Northwestern Polytechnical University,2009.(in Chinese)
[14]	杨文青.基于重叠网格的扑翼飞行器绕流数值模拟研究 .西安:西北工业大学,2010. YANG Wenqing.Numerical simulation of flowfield over flapping-wing micro air vehicle based on overset grids .Xi'an:Northwestern Polytechnical University,2010.(in Chinese)
[15]	宋书恒,微型飞行器相关气动力特性的数值模拟 .绵阳,中国空气动力研究与发展中心,2007. SONG Shuheng.Numerical simulation of aerodynamic characteristics for micro air vehicles .Mianyang:China Aerodynamics Research and Development Center,2007.(in Chinese)
[16]	宫兆新,鲁传敬,黄华雄.浸入边界法及其应用[J].力学季刊,2007,28(3):353-362. GONG Zhaoxin,LU Chuanjing,HUANG Huaxiong.Immersed boundary method and its application[J].Chinese Quarterly of Mechanics,2007,28(3):353-362.(in Chinese)
[17]	Bush B L,Baeder J D.Computational investigation of flapping-wing flight .AIAA 2007-4209,2007.
[18]	肖天航,昂海松,周新春.柔性扑翼非定常流场的数值计算方法[J].航空学报,2009,30(6):990-999. XIAO Tianhang,ANG Haisong,ZHOU Xinchun.Numerical method for unsteady flows of flexible flapping-wings[J].Acta Aeronautica et Astronautica Sinica,2009,30(6):990-999.(in Chinese)
[19]	Gopalakrishnan P,Tafti D K.A parallel boundary fitted dynamic mesh solver for applications to flapping flight[J].Computers & Fluids,2009,38(8):1592-1607.
[20]	王利光.微型扑翼飞行器动力系统设计与优化 .西安:西北工业大学,2008. WANG Liguang.Design and optimization for the propulsion system of the flapping-wing micro air vehicle .Xi'an:Northwestern Polytechnical University,2008.(in Chinese)
[21]	Tobalske B W,Peacock W L,Dial K P.Kinematics of flap-bounding flight in the zebra finch over a wide range of speeds[J].The Journal of Experimental Biology,1999,202(13):1725-1739.
[22]	Thomas A L R,Taylor G K.Animal flight dynamics Ⅰ:stability in gliding flight[J].Journal of Theoretical Biology,2001,212(3):399-424.
[23]	Van Den Berg C,Rayner J M V.The moment of inertia of bird wings and the inertial power requirement for flapping flight[J].The Journal of Experimental Biology,1995,198(8):1655-1664.