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基于格林定理在时域中推导了适用于任意地形的二维机翼地效翼性能的计算方法.静止坐标系上,在所有边界布置兰金源和偶极子,对满足物面边界条件和尾涡面库塔条件的积分方程进行数值离散.翼表面网格坐标和尾涡面上的偶极强度随时间步进变化.将平直地面下NACA0012翼型升力系数随攻角变化的时域计算结果与已发表的试验数据进行比较,结果表明本文时域计算地效翼问题可行.最后讨论了地形变化对机翼升力的影响,进而非直平面二维地效翼性能计算可发展为自由面上的地效翼性能计算.
Based on the Green's theorem, a method for calculating the efficiency of two-dimensional wing-based wings for any terrain is deduced in the time domain. In the stationary coordinate system, Rankine sources and dipoles are arranged at all boundaries, Finally, the integral equation of the wake vortex Kuta conditions is numerically discretized, and the wing surface grid coordinates and the dipole intensity on the wake vortex surface change step by step with time. When the lift coefficient of NACA0012 airfoil under straight ground changes with the angle of attack Compared with the published experimental data, the results show that this paper calculates the effective wing problem in the time domain.Finally, the influence of the terrain variation on the wing lift is discussed, and then the calculation of the two-dimensional wing-free wing performance can be developed into Ground wing performance calculation on free surface.