扑翼非定常气动特性的实验研究

扑翼的动态特性使其具有与固定翼完全不同的飞行模式,为了研究扑翼在扑动周期内的非定常气动特性,建立基于虚拟仪器的扑翼风洞实验测控系统,能够实现对气动力、扑动角度、功率等物理量的实时测量;以斯特劳哈尔数作为扑翼非定常程度的度量标准,并根据斯特劳哈尔数的定义完成扑翼在不同扑动幅度、扑动频率和来流速度条件下的风洞实验;分析扑翼在不同条件下的升力、推力及推进效率,进而得出斯特劳哈尔数对扑翼气动特性的影响规律。结果表明:扑翼的气动力随斯特劳哈尔数的增大而显著增大;当斯特劳哈尔数处于特定范围内时,扑翼具有较高的推进效率。

Experimental Research of Unsteady Aerodynamics for Flapping-wing

The dynamic feature makes flapping-wing much different from fixed-wing .In order to study the un-steady aerodynamics of flapping-wing ,a flapping-wing wind tunnel experimental system based on virtual instru-ment is set up ,which can perform real-time measurement of aerodynamic force ,flapping angle ,power con-sumption and so on .The Strouhal number （St） is regarded as a key issue of unsteady aerodynamics .A series of wind tunnel experiments ,based on the definition of St ,are carried out to explore the influence of the St ,which is varied by different flapping amplitude ,flapping frequency and wind velocity .The lift ,thrust and propulsion efficiency of the flapping-wing in different conditions are analyzed ,and the influence rule of St on aerodynamic characteristics for flapping-wing is got .The experiment results show that ,as St increases ,the aerodynamic force of flapping-wing increases significantly ;and the propulsion efficiency keeps in a high level when St is in a certain range .