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昆虫起飞的气动机理研究对于微型飞行器(MAV)的设计具有重要的参考意义。本文基于前人对果蝇自由起飞阶段测得的实验结果,构建了翼的二维模型和运动方程。采用人工伪压缩方法求解非定常不可压缩NS方程组,通过分析流场涡结构的发展演化和压强变化对流体动力的影响,深入研究了非定常气动力的产生过程,并探讨了翻转模式和下拍时间比对于气动性能的影响。结果表明:自由起飞的第一次挥拍对果蝇的自由起飞具有重要的影响。其中第一次下拍采用了大的超前比率和小的下拍时间比,这使得第一次下拍产生了很高的升力。果蝇自由起飞中翼翻转普遍采用了超前模式,大的超前比率和小的下拍时间比可以产生很高的升力。
The aerodynamic mechanism of insect takeoff is of great significance to the design of Micro Air Vehicle (MAV). In this paper, based on the previous experimental results of fruit fly free takeoff stage, the two-dimensional model of wing and the equation of motion are constructed. The artificial pseudo-compression method is used to solve the unsteady incompressible Navier-Stokes equations. By analyzing the evolution of the vortex flow in the flow field and the influence of pressure changes on hydrodynamics, the generation process of unsteady aerodynamics is studied in detail. Effect of beat time on aerodynamic performance. The results show that the first swing of free takeoff has an important influence on the free takeoff of fruit flies. The first shot used a large lead ratio and a small down time ratio, which made the first shot produced a very high lift. Drosophila free take-off mid-wing flip generally adopted the advanced mode, a large lead ratio and a small downtime than can produce high lift.