It is challenging to mimic flying insects and create effective artificial flapping drones that can imitate their flying techniques. The results reveal the variation of the flow field measurement data feasible to the wind tunnel and other techniques and are useful in the design of wing kinematics of a micro aerial vehicle.įlying insects are interesting dipteras with an outstanding wing structure that makes their flight efficient. This new technique is quantitative in nature, and in the future, we hope to complement the qualitative wind tunnel smoke line experiment.
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It includes how to quantify the soap film imaging into lift and thrust forces, and the comparison with the result of the wind tunnel force measurement. In addition to the qualitative comparison of soap-film imaging with the conventional smoke tracing method, the subsequent processing of the soap-film images was also demonstrated. This thesis innovatively used soap-film visualization with high-speed photography to record a 2D colorful flow field generated by a hovering flapping wing of a 10 cm span. Then the author mixes the bubble liquid for the experiment, improve the experimental design, acquire the images of the soap film experiment, processed and analyze the images finally the net thrust value of the flapping wing was obtained from the soap film image and finally compared with the wind tunnel results.
The work firstly summarized the soap film flow visualization of a flapping wing along 3 different orientations and their corresponding formula for predicting lift and net thrust.
Besides the computational fluid mechanics (CFD) technology, flow visualization is also needed to assist this research. When designing FWMAVs, detailed unsteady aerodynamic information is required. Flapping wing micro-air-vehicles (FWMAVs) animate the small-space dexterous flight, hovering, and energy-saving characteristics of birds and insects, and are believed to have enlightenment for the development of bionic flight in the future. This study is based on a modified design of the "2D quasi-steady flow around a flapping wing and its bubble film flow visualization" by our team, Huang, Hsin-Lun, in 2014, and Chih-Yu Jen, in 2019 to change from the forward flight to vertical hovering.
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