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采用非定常势流板块法和Euler-Bernoulli梁振动微分方程,对后缘带弹性薄板的翼型在作沉浮运动时翼型绕流和薄板弹性振动之间的流-固耦合过程进行数值模拟,并计算流动特性、非定常气动载荷,尤其是沉浮运动的推力效应。用有限差分法求解薄板的弹性变形运动,气动弹性分析采用弱耦合迭代方式。通过对翼型非定常气动力(升力和推力)、推进效率、尾迹脱落涡计算结果的分析发现,通过调整弹性薄板的刚度,可以使得翼型产生最佳的非定常推力。
The unsteady flow plate method and the Euler-Bernoulli beam vibration differential equation are used to simulate the fluid-solid coupling process between the airfoil flow and the thin-plate elastic vibration in the airfoil with elastic sheet on the trailing edge. And calculate the flow characteristics, unsteady aerodynamic loads, especially the thrust effect of ups and downs. The finite difference method is used to solve the elastic deformation of the thin plate. The aeroelasticity analysis is based on the weakly coupled iterative method. By analyzing the results of unsteady aerodynamic forces (lift and thrust), propulsive efficiency and wake shedding vortices, it is found that the optimal unsteady thrust of the airfoil can be obtained by adjusting the stiffness of the elastic thin plate.