地面效应下前/后掠翼气动特性研究

针对飞行器在地效区飞行时复杂的流场特性,通过求解定常可压N-S方程,改变机翼后掠角和地效区飞行高度,研究不同前/后掠角机翼在地效区内的气动特性。结果表明:在地效区内,随着后掠角的增大,机翼的升力系数和阻力系数呈现先增后减的变化规律,后掠角在0°附近时升力系数达到最大值,阻力系数在10°附近达到最大值;俯仰力矩系数随着后掠角增加而减小;展向流动在后掠角为0°时最小,展向流动随着后掠角增大或减小剧烈变化;机翼下洗角随着后掠角增大而减小,随着离地高度的减小而减小。研究结果可为地效飞行器的概念方案设计和优化提供理论依据。

Aerodynamic Investigation of Forward-Swept and Backswept Wing in Ground Effect

The aerodynamic characteristics of forward-swept and back swept wing in ground effect was researched carefully by solving steady incompressible N-S equations. According to the computation of lift and drag coefficient for the same area wing with different forward swept and swept angle, we can get the aerodynamic characteristics of wings in free space and ground effect. As a result, lift/drag coefficient and lift-drag ratio decrease and aerodynamic center moves backward with the increase of backswept in ground effect. Meantime, downwash angle decreases with back-swept angle increasing. While with the increase of forward-swept angle, lift/drag coefficient decreases and aerodynamic center moves forward, but the lift-drag ratio almost keep constant. The results can provide theoretical basis for the programming and optimization of aircraft in ground effect.