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建立了一个基于结构运动嵌套网格的流场求解器,用来精确模拟复杂的旋翼流场,为更好地预测旋翼气动载荷提供一套计算方法。在该求解器中,控制方程为惯性坐标系下的三维非定常Navier-Stokes方程,空间方向上采用低数值耗散的Roe格式结合三阶逆风格式(Monotonic upwind scheme for conservation law,MUSCL),湍流模式采用了一方程的Spalart-Allmaras模型。应用所建立的方法,分别针对Caradonna模型旋翼、UH-60A直升机旋翼的悬停流场和7A旋翼、SA349/2直升机旋翼的前飞流场以及旋翼气动载荷进行了数值模拟。计算结果表明,本文的方法在一定程度上提高了对旋翼流场的模拟能力,进而提高了旋翼气动载荷的计算精度。
A flow field solver based on a nested grid of structure motion is established to accurately simulate the rotor flow field and provide a set of calculation method for better predicting rotor aerodynamic loads. In this solver, the governing equations are the three-dimensional unsteady Navier-Stokes equations in inertial coordinates, the space-oriented Roe scheme with low numerical dissipation in combination with the Monotonic upwind scheme for conservation law (MUSCL), the turbulent The model uses an equation of the Spalart-Allmaras model. The proposed method was used to simulate the aerodynamic loads of Caradonna model rotors, UH-60A helicopter rotors hovering flow field and 7A rotor, SA349 / 2 helicopter rotors forward flight flow field, and rotor rotors respectively. The calculation results show that the method proposed in this paper improves the simulation capability of the rotor flow field to some extent, and then improves the calculation accuracy of rotor aerodynamic loads.