论文部分内容阅读
通过求解二维非定常雷诺平均N-S方程,使用k-ωSST湍流模型,分析了地面效应对二维干净构型、增升构型失速攻角变化的影响;对移动地面、固定地面条件下两种二维构型的气动特性进行了研究,并探讨了近地高度变化对流场的影响。结果表明:地面效应使得干净构型增升减阻,增升构型减升减阻,但使两种构型的失速攻角均减小;移动地面、固定地面条件下两种构型升阻力变化趋势一致;干净构型小攻角时固定地面条件下的升阻力均稍大于移动地面,而增升构型则呈现升力小于移动地面、阻力高于移动地面的趋势。地面效应对增升构型的影响高度范围较干净构型更广。
By solving the two-dimensional unsteady Reynolds average Navier-Stokes equations and using the k-ωSST turbulence model, the effect of the ground effect on the two-dimensional clean configuration and the increase of the attack angle of the stalled configuration is analyzed. For moving ground and fixed ground conditions, The aerodynamic characteristics of two-dimensional configuration are studied, and the effect of the change of near-ground height on the flow field is discussed. The results show that: the ground effect makes the clean configuration increase and decrease the drag, the increase configuration reduces the drag reduction, but both the configurations reduce the angle of attack of attack; both the moving ground and fixed ground conditions lift resistance The trend of change is the same. The lift resistance of fixed configuration under a small angle of attack is a little larger than that of a fixed floor, while that of an elevated configuration is less than that of moving ground and the resistance is higher than that of moving ground. The effect of the ground effect on the elevated configuration is much broader than the clean configuration.