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aerodynamic mechanism of forces generated by twisting model-wing in bat flapping flight

Applied Mathematics and Mechanics(English Edition) 2014年第12期35卷 1607-1618页

作者：管子武余永亮 Department of Modern Mechanics University of Science and Technology of China The Laboratory for Biomechanics of Animal Locomotion University of Chinese Academy of Sciences

The aerodynamic mechanism of the bat wing membrane Mong the lateral border of its body is studied. The twist-morphing that alters the angle of attack （AOA） along the span-wise direction is observed widely during bat flapping flight. An assumption is made that the linearly distributed AOA is along the span-wise direction. The plate with the aspect ratio of 3 is used to model a bat wing. A three-dimensional （3D） unsteady panel method is used to predict the aerodynamic forces generated by the flapping plate with leading edge separation. It is found that, relative to the rigid wing flapping, twisting motion can increase the averaged lift by as much as 25% and produce thrust instead of drag. Furthermore, the aerodynamic forces （lift/drag） generated by a twisting plate-wing are similar to those of a pitching rigid-wing, meaning that the twisting in bat flight has the same function as the supination/pronation motion in insect flight.

关键词： bat wing twisting panel method aerodynamic mechanism

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Unsteady characteristic research on aerodynamic interaction of slotted wingtip in flapping kinematics

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Chinese Journal of Aeronautics 2022年第4期35卷 82-101页

作者： Dan LIU Bifeng SONG Wenqing YANG Dong XUE Xinyu LANG School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Yangtze River Delta Research Institute.Northwestern Polytechnical University Taiccing 215400China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

The slotted wingtip structure of birds is considered to be the product of improving flight efficiency in the process of evolution. It can change the vortex structure of wingtip and improve aerodynamic efficiency. This paper reports a numerical investigation of slotted wing configuration undergoing bio-inspired flapping kinematics(consisting of plunging and in-line movement)extracted from a free-flying bald eagle wing. The aim is to eluci-date the collective mechanism of the flow generated by slotted tips and the lift contribution of each tip. Specifi-cally, the objective of the study is to determine how changes in the wing spacing affect the resulting aerodynamic interaction between the slotted tips and how that affects the force generation and efficiency. Changes in the phase angle between the flapping motions of slotted tips, as well as the spacings among them,can affect the resulting vortex inter-actions. The rear tips often operates in the wake of the frontal tips and, meanwhile, the vortex generated by the movement of the rear tips promote the frontal *** interaction of vortices in time and space leads to wing-wing interference and the flow around slotted tips becomes complicated and unstable. The innovative study of wingtip slot in unsteady state leads us to find that the aerodynamic interaction among slotted tips makes the overall lift characteristic better than that of the unslotted wings. The slotted wing configuration can efficiently convert more energy into lift. As the flapping frequency increases, the collective feature of slotted wing with constantly changing gaps can be more advantageous to enhance lift-generation performance.

关键词： aerodynamic interaction aerodynamic mechanism Flapping Unsteady behavior Wingtip slots

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