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根据前行桨叶概念(ABC)旋翼配平方程中未知量多于方程数的特点,提出了一种基于优化的配平问题求解方法。进而结合计算流体力学(CFD)/计算结构动力学(CSD)松耦合策略,建立了ABC旋翼动力学分析方法。CFD分析中以非定常Euler/Navier-Stokes方程为控制方程,通过动态重叠网格及动网格方法实现桨叶的运动及变形;桨叶结构模型采用非线性中等变形梁理论建立。以XH-59A直升机为例,对不同前飞速度下的旋翼效率进行了仿真分析,计算结果与飞行试验值吻合良好。仿真结果表明,该旋翼动力学分析方法具有很好的分析精度和收敛性,可广泛应用于ABC旋翼动力学分析。
According to the characteristic that the unknowns in the blade equation of forward blade (ABC) is more than the number of equations, a solution to the problem of trim problem based on optimization is proposed. Furthermore, combined with computational fluid dynamics (CFD) / computational structural dynamics (CSD) loose coupling strategy, a dynamic analysis method of ABC rotors is established. In the CFD analysis, the unsteady Euler / Navier-Stokes equation is used as the control equation, and the motion and deformation of the blade are realized by dynamic overlay grid and moving grid method. The blade structure model is established by using the nonlinear medium deformation beam theory. Taking XH-59A helicopter as an example, the rotor efficiency under different forward flight speeds is simulated and the results are in good agreement with the flight test. The simulation results show that the rotor dynamics analysis method has a good analysis accuracy and convergence, and can be widely used in ABC rotor dynamics analysis.