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The Differential Equation Algorithm for General Deformed Swept Volumes

Journal of Computer Science & Technology 2000年第6期15卷 604-610页

作者：汪国平华宣积孙家广 DepartmentofComputerScienceandTechnology PekinUniversityBeijing100871P.R.China

The differential equation approach for characterizing swept volume boundaries is extended to include objects experiencing deformation. For deformed swept volume, it is found that the structure and algorithm of sweep-envelope differential equation (SEDE) are similar between the deformed and the rigid swept volumes. The efficiency of SEDE approach for deformed swept volume is proved with an example.

关键词： CAD geometric modeling sweeping motion deformation swept volume

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LARGE AERODYNAMIC FORCES ON A sweeping WING AT LOW REYNOLDS NUMBER

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Acta Mechanica Sinica 2004年第1期20卷 24-31页

作者：孙茂吴江浩 Institute of Fluid Mechanics Beijing University of Aeronautics & AstronauticsBeijing 100083China

The aerodynamic forces and flow structure of a model insect wing is studied by solving the Navier-Stokes equations *** an initial start from rest,the wing is made to execute an azimuthal rotation(sweeping)at a large angle of attack and constant angular *** Reynolds number(Re)considered in the present note is 480(Re is based on the mean chord length of the wing and the speed at 60% wing length from the wing root).During the constant-speed sweeping motion,the stall is absent and large and approximately constant lift and drag coefficients can be *** mechanism for the absence of the stall or the maintenance of large aerodynamic force coefficients is as *** after the initial start,a vortex ring,which consists of the leading-edge vortex(LEV),the starting vortex,and the two wing-tip vortices,is formed in the wake of the *** the subsequent motion of the wing,a base-to-tip spanwise flow converts the vorticity in the LEV to the wing tip and the LEV keeps an approximately constant *** prevents the LEV from *** a result, the size of the vortex ring increases approximately linearly with time,resulting in an approximately constant time rate of the first moment of vorticity,or approximately constant lift and drag coefficients. The variation of the relative velocity along the wing span causes a pressure gradient along the wing- *** base-to-tip spanwise flow is mainly maintained by the pressure-gradient force.

关键词： model insect wing sweeping motion high lift leading-edge-vortex

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