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研究了翼型在低马赫数条件下的非定常气动特性,从翼型表面气流运动的角度对Leishman-Beddoes(L-B)模型进行了修正,并在此基础上建立了适合低马赫数颤振研究且带有气动及结构非线性的二元机翼气弹系统分析模型.对比低马赫数翼型气动载荷试验结果表明对L-B模型的修正是有效的,且机翼颤振试验结果亦验证了二元机翼气弹分析模型.研究结果表明:二元机翼气弹系统的失速颤振与初始变距角和来流速度密切相关,且耦合的三次非线性变距和浮沉刚度是造成系统呈现准周期运动的主要原因.
The unsteady aerodynamic characteristics of the airfoil at low Mach numbers are studied. The Leishman-Beddoes (LB) model is modified from the airfoil movement on the airfoil. Based on this, And the aerodynamic and structural nonlinear airfoil aeroelastic system analysis model is presented.Compared with the low Mach number airfoil aerodynamic loading test results show that the LB model is valid and the wing flutter test results also verify the second The results show that the stall flutter of the binary aeroelastic system is closely related to the initial pitch angle and the flow rate of the incoming air, and the three nonlinear transitions and the floating stiffness of the coupled system are caused by the system rendering The main reason for quasi-periodic exercise.