In order to improve lift and drag characteristics of ground effect aircraft,experiments are made by measuring lift,drag characteristics,and wake velocity fields with a downward-forward swept wing and a biomimetic wing.On the basis of analyzing the wing tip vortex flow field structure,the mechanism of wing lift and drag changes is discussed from the perspective of spanwise flow.The results show that with-in the ground effect zone,the downward-forward structure can effectively improve the flow characteristics of the wing,suppress the formation and development of wing tip vortex flow,increase the vortex center distance,the effect is made with the lift being increasing and drag force being decreasing,and the closer the wing is to the ground,the more obvious the effect is.On this basis,the concave convex leading edge can further optimize the flow characteristics of the wing,reduce the intensity of the wing tip vortex,and reduce the induced drag.In small clearance ratio and small angle of attack conditions,the biomimetic wing with a downward-forward sweep structure with a concave convex leading edge has the optimal navigation e-conomy.This provides a reference for improving the flight performance of ground effect wings and promo-ting the development of ground effect wing design theory.
关键词
地面效应/平直翼/下反前掠翼/仿生翼/升力和阻力/PIV实验
Key words
ground effect/straight wing/downward-forward swept wing/bionic wing/lift and drag forces/PIV experiment
维普
万方数据