| Summary: | 碩士 === 中華大學 === 機械工程學系碩士班 === 100 === In this thesis, the aerodynamic performance of the seagull's flight is simulated. The widely used NACA0012 airfoil is adopted as the computational model to mimic the seagull's wing. The considered flight kinematic parameters as the flapping amplitude of the rigid and flexible wings coupling with reduced frequency, pitching angle and angle of attack are the main concerns in our studies. To validate our computations, an oscillating cylinder under different Reynolds number and reduced frequencies is computed and compared with the experimental data such as the lift and drag. In addition, the flow over a three-dimensional NACA0012 airfoil is calculated and compared the thrust distribution with the previous work. Secondly, the flow fields of the three-dimensional rigid and flexible NACA0012 airfoils under different reduce frequency are computed and studied. It is found that the mildly flexible wing with large reduced frequency of really can enhance the lift. Finally, The aerodynamics of the rigid and flexible wings at different angle of attack are simulated. It is interesting to know that the flexibility of the flapping wing compared with the rigid wing at the same flapping amplitude and reduced frequency can delay the stall and increase the lift.
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