基于状态空间法的低马赫数翼型气动载荷计算

Prediction of airfoil airload at low Mach numbers based on state space formulation

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 Leishman-Beddoes （L-B） unsteady and dynamic stall model is applicable to the medium Mach numbers （MAYO. 3）, and some inconsistent problems for predicting airfoil airload when comparing with airfoil airload test data at low Mach numbers （Ma〈 0. 3）, so firstly the unsteady and dynamic stall aerodynamic behavior of airfoil at low Mach numbers was investigated, secondly the modified L-B model was set from the viewpoint of the variation of the flow on the airfoil surface, finally the comparisons between the modified L-B and airfoil airload test data at low Mach numbers show that the modified L-B model with state space formulation is accurate and can be used to predict the airfoil airload at low Mach numbers, and also it can be easily incorporated into a helicopter comprehensive code.