In recent years, researchers have worked hard to improve the efficiency of energy collection devices because a better use of renewable energy is required for energy protection and emission reduction. To improve the energy harvesting efficiency of a flapping wing, this study proposes a blower model for the first time. By installing blower aspirators at the rear of the upper and lower wing surfaces of an airfoil, this airfoil can achieve higher lift and torque than the original airfoil. This study was performed under a Reynolds number and focused on the impact of the attenuation frequency, the effective angle of attack, and a fixed selection of optimal blower speeds. The unsteady laminar two-dimensional numerical simulation results show that there is an optimal working area on the upper and lower airfoil blowers under the given working conditions, and the energy collection efficiency increases when the upper and lower airfoil blowers have similar speeds. For different attenuation frequencies and effective angles of attack, the optimal blower speed improved by 10%, with the highest being 26.7%. Through a flow field analysis, the vortex of the flapping wing equipped with a blower was found to be closer to the airfoil than the vortex of original airfoil at different times and it had a higher vortex intensity than the original. Choosing a reasonable blower velocity can help to capitalize on the blower’s ability to increase lift and torque, and thus improve the efficiency of a flapping wing.

中文翻译：

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带吹气吸气器的扑翼箔的能量收集特性：数值研究

近年来，由于能源保护和减排需要更好地利用可再生能源，研究人员努力提高能量收集装置的效率。为了提高扑翼的能量收集效率，本研究首次提出了鼓风机模型。通过在翼型上下翼面后部安装鼓风机，该翼型可以获得比原翼型更高的升力和扭矩。这项研究是在雷诺数下进行的，重点关注衰减频率、有效迎角和最佳鼓风机速度的固定选择的影响。非定常层流二维数值模拟结果表明，在给定工况下，上下翼型鼓风机存在最佳工作区域，且当上下翼型鼓风机转速相近时，能量收集效率提高。对于不同的衰减频率和有效攻角，最佳风机转速提高了10%，最高可达26.7%。通过流场分析发现，配备鼓风机的扑翼在不同时刻的涡流均比原翼型的涡流更接近翼型，且涡流强度较原翼型更高。选择合理的鼓风机速度有助于利用鼓风机增加升力和扭矩的能力，从而提高扑翼的效率。