仿生折叠翼扑动过程气动特性分析

Analysis of Aerodynamic Characteristics of Bionic Folding Wing During Flapping

以甲虫后翅为仿生对象,基于四板机构理论设计了一种仿甲虫四板折叠翼,并对其气动特性进行研究。建立了仿甲虫四板折叠翼动力学仿真模型,采用双向流固耦合数值模拟方法,分析了扑动幅值、拍动频率与前飞速度对柔性折叠翼的升阻力系数和空气流场的影响,并对柔性折叠翼扑动过程进行了流场研究。研究表明,柔性折叠翼能提高飞行器的升力特性和推力特性,其扑动幅值为80°,频率为50Hz时,折叠翼的气动特性最为显著。本研究工作为优化折叠翼的设计及控制奠定了基础。

Taking the beetle hind wings as a bionic object,a four-plate folding wing like the beetle was designed based on the theory of four-plate mechanism,and its aerodynamic characteristics were studied.A dynamic simulation model of the beetle-like four-plate folding wing was established.Using a two-way fluid-structure coupling numerical simulation method,the effects of flapping amplitude,flapping frequency and forward flight speed on the lift-drag coefficient and air flow field of the flexible fold-ing wing were analyzed.The fluttering process of the flexible folding wing is studied in the flow field.Studies have shown that flex-ible folding wings can improve the lift characteristics and thrust characteristics of the aircraft.When the flapping amplitude is 80°and the frequency is 50Hz,the aerodynamic characteristics of the folding wings are the most significant.This research work laid the foundation for optimizing the design and control of the folding wing.