基于波状地面效应的自主运动仿生翼力学特性研究

Research on Mechanical Property of Wavy Ground on a Self-propelled Bionic Wing

自然界的生物可以利用地面效应获得的优良运动性能,受此启发,本文运用数值模拟研究了仿生翼在正弦波状地面下的自主运动。通过分析波状地面波长、翼型初始高度和俯仰周期对仿生翼性能的影响,深入分析了自主运动翼的位移、受力和绕流情况,揭示了波状地面效应下自主仿生翼的非定常涡度动力学。研究结果表明,当地面波长与仿生翼长度相同时,近地面的高频俯仰周期并不能使仿生翼获得最大的位移,适当的提高初始高度与俯仰周期能使仿生翼获得最佳升阻比。当地面波长增加为仿生翼长度的2倍时,大俯仰周期能使仿生翼获得最佳升阻比。

The living creatures can use the ground effect to obtain excellent performance,inspired by this,this paper uses numerical simulation to study the self-propelled pitching bionic wing under wavy ground.The influence of wavelength,initial height of wing and pitching period on the performance of bionic wing was analyzed.The displacement,force and flow around the wing were analyzed in depth.The unsteady vorticity dynamics of the self-propelled bionic wing under the wavy ground effect was revealed.The results show that when the wavelength is the same as the length of bionic wing,the high frequency pitching period near the ground can not make the bionic wing get the maximum displacement,and the optimal lift-to-drag ratio can be obtained by properly increasing the initial height and pitch period.When the surface wavelength is increased to twice the length of the bionic wing,the optimal lift resistance ratio can be obtained by large pitch period.