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Leishman-Beddoes(L-B)非定常动态失速模型适用于中等马赫数(Ma>0.3),而在低马赫条件(Ma<0.3)下存在与翼型气动试验数据不符合的问题,为此首先研究了低马赫数条件下翼型的非定常动态失速气动特性,其次采用状态空间法从翼型表面气流变化的角度修正了L-B模型,最后通过与翼型气动载荷试验数据的对比表明在低马赫数条件下对L-B模型的修正是正确的,能够准确预测及分析翼型的气动载荷,且该修正模型易于耦合进直升机综合分析代码中.
The unsteady dynamic stalling model of Leishman-Beddoes (LB) is suitable for medium Mach number (Ma> 0.3), whereas the problem of inconsistent aerodynamic test data with airfoils under low Mach conditions (Ma <0.3) Low Mach number of airfoils unsteady dynamic stall aerodynamic characteristics, followed by the use of state space method from the airfoil surface airflow changes point of view of the modified LB model, and finally compared with the airfoil aerodynamic test data show that in the low Mach number conditions The correction of the LB model is correct, which can accurately predict and analyze the aerodynamic loads on the airfoils, and the correction model can be easily coupled into the helicopter comprehensive analysis code.