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自由尾迹的桨叶气动模型中,考虑了由于桨叶预扭导致尾随涡不在同一个平面对控制点诱导速度的影响,翼型气动模型采用Leishman-Beddoes非定常气动模型,并推导得到操纵下的桨叶挥舞运动方程。采用二阶精度时间步进格式,耦合桨叶气动模型、挥舞运动方程,构建时间步进自由尾迹算法。而后计算旋翼尾迹在操纵条件下的变化历程,得到旋翼的气动响应。通过计算结果与实验数据的对比,验证方法的可行性,并分析操纵速率、预扭对气动响应的影响。
In the aerodynamic model of blade with free wake, the influence of wake vortex on the induced velocity of control point due to the non-same vortex is considered. The airfoil aerodynamic model uses the unsteady aerodynamic model of Leishman-Beddoes and derives the aerodynamic model Blade waving motion equation. The second-order precision time stepping format is adopted, the aerodynamic model of the blade is coupled, the motion equation is waving, and the free stepping algorithm of time step is constructed. Then calculate the change process of the rotor wake under the control conditions to obtain the aerodynamic response of the rotor. By comparing the calculated results with the experimental data, the feasibility of the method is verified, and the influence of the manipulative rate and pre-twist on the aerodynamic response is analyzed.