【摘要】 针对三维等直机翼型(NACA0015),采用计算流体动力学(CFD)分析方法,以非定常不可压缩流动N-S方程和2阶RNGk-ε湍流模型,对高海况波浪地面效应进行了数值模拟与分析.首先在二维情况下数值模拟分析了波浪地面效应,讨论了计及当地风速和波浪行进速度的必要性,同时分析了高海况下波浪地面效应翼型气动力系数随飞行高度变化趋势及原因.在此基础上,计算分析了三维情况下,等直机翼在不同航向与风向角时的气动力系数及滚转力矩的变化,并重点对侧风影响下的滚转力矩产生机理及变化特点进行了论述.通过数值模拟,初步探讨了高海况下波浪地面效应对等直机翼气动特性的影响规律,为深入研究高海况对地效飞行器设计的影响提供了依据.更多还原

【Abstract】 The 3-dimensional straight wing(NACA0015airfoil)flying over wavy ground at high grade sea condition was studied numerically by adopting the computational fluid dynamics(CFD)method.The N-S equation of unsteady incompressible flow and second order RNGk-εturbulence model were solved in Fluent.First,the necessity of involving local wind speed and velocity of wave when researching qavy-groundeffect numerically was investigated with 2-dimensional cases.Besides,the trends and reasons that aerodynamic coefficients vary with ground clearances under wavy-ground-effect were studied.Then,the aerodynamic force and the rolling moment of 3-dimensional airfoil were analyzed when the course angle between the direction of flight and local wind speed were different,and detailed description of the causes and characteristics of the rolling moment were made.After numerically researching these cases,the impact of wavy-ground-effect at high grade sea conditions on the airfoil was illustrated preliminarily,providing basic theory to aerodynamic design and flight control for WIG craft.更多还原