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Numerical Simulation and Mechanism Analysis of a Slender Delta Wing Undergoing Combined Free-roll and Free-sideslip Motion


Dynamic characteristics of an 80° delta wing in combined free-roll andrnfree-sideslip are investigated numerically by solving flow governing equations andrnEuler rigid-body dynamics equations simultaneously. Implicit, upwind, fluxdifferencernsplitting, finite volume scheme and the second-order-accurate finiterndifference scheme are employed to discrete and solve these governing equations.rnFirstly, the double degrees-of-freedom (DOFs) motion of the delta wing, withrndimensionless mass 25.0 and roll axis moment of inertial 0.0622, are simulatedrnnumerically at 30° incidence angle, Mach number 0.35 and Reynolds numberrn2.5×106. Then the roll characteristics of the delta wing in combined free-roll andrnfree-sideslip are investigated by comparing with those of single DOF wing rock.rnThirdly, the coupling kinematic mechanism between free-roll and free-sideslip isrndiscussed, and the flow mechanism sustaining double DOFs wing rock of slenderrndelta wing in combined free-roll and free-sideslip is analyzed also. Lastly, therninfluences of dimensionless mass and moment of inertial are discussed briefly. Thernresults show: Double DOFs motion established larger roll amplitudes obviouslyrngreater than that of single DOF wing rock; Sideslip motion has an influence on thernbifurcation attack angle, combined roll and sideslip wing rock phenomenon mayrnemerge at a lower incidence angle than that of single DOF wing rock, similarity ofrnDOFs should be took as an important similarity rule to be satisfied; Asymmetricrnoscillation of vortices is the flow mechanism sustaining wing rock of slender deltarnwing in combined free-roll and free-sideslip; Right sideslip during left rolling andrnleft sideslip during right rolling are the coupling kinematic mechanism of slenderrndelta wing in combined free-roll and free-sideslip motion; with the influence ofrnsideslip, attack angle and sideslip angle lag behind the roll angle is observed, thernasymmetric characteristics of flow structures and hysteresis effects are enforcedrnduring coupling wing rock; With the same mass, the roll amplitudes increase withrnroll axis moment of inertial increase which is indifferent with single DOF wingrnrock; With the same roll axis moment of inertial, the roll amplitudes decrease withrnmass increase.......

【作者名称】: Yang XiaoLiang, Liu Wei, Zhou YunLong
【作者单位】: Department of Aerospace Science and Engineering, National University of Defense Technology,410073 Changsha Hunan, China yangxl_nudt@sina.com, Department of Aerospace Science and Engineering, National University of Defense Technology,410073 Changsha Hunan, China, Department of Aerospace Science and Engineering, National University of Defense Technology,410073 Changsha Hunan, China
【关 键 词】: Navier-Stokes, Double Degrees-of-freedom, Wing Rock, Slender Delta Wing, Free-roll, Free-sideslip
【会议名称】: Eighth International Conference on Computational Fluid Dynamics
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 100,835,276
【摘要长度】: 2,292
【会议地点】: Chengdu(CN)
【会议组织】: Department of Aerospace Science and Engineering, National University of Defense Technology,410073 Changsha Hunan, China yangxl_nudt@sina.com;Department of Aerospace Science and Engineering, National University of Defense Technology,410073 Changsha Hunan, China;Department of Aerospace Science and Engineering, National University of Defense Technology,410073 Changsha Hunan, China;
【会议时间】: 2014
【上篇论文】: 外文会议 - An Atomistic Approach to Conduction Between Nanoelectrodes Through a Single Molecule
【下篇论文】: 外文会议 - Hard x-ray spectral energy distributions from pulsed power generators measured by transmission crystal spectrometers

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