关键词: 分布式涵道风扇, 气动性能, 动量源方法, 高效高精度

Abstract: Due to its complex component composition and aerodynamic coupling effect, it is a challenging task to accurately and efficiently predict the aerodynamic characteristics of the distributed ducted fan-wing coupling configuration. To this end, this paper proposes a distributed ducted fan momentum source method based on the Reynolds-averaged Navier-Stokes (RANS) equations and fully considering the aerodynamic-propulsion coupling effect of multiple com-ponents. This method greatly improves the computational efficiency by simplifying the flow field calculation of the rotor and stator blades, while accurately capturing the wing boundary layer viscosity effect, the duct lip acceleration effect, and the exhaust duct wake effect, thereby accurately predicting the aerodynamic performance of components such as the wing, duct lip, and exhaust duct. Specifically, this method uses the RANS equation combined with the multiple reference frame (MRF) method to calculate the quasi-steady flow field, extracts information such as the three-directional velocity, turbulent kinetic energy, and eddy dissipation rate at the interface, and applies it as a boundary condition to the fan-less configuration to simulate the dynamic effect of the ducted fan. In the single ducted fan-wing section coupled configuration test, compared with the MRF method, the lift coefficient calculated by this method has a relative error of less than 2%, and the drag coefficient has a relative error of less than 4.5%, and the calculation time is reduced by more than 90%, and the calculation accuracy is better than the traditional momentum source method. In addition, the study shows that the flow field information extracted by this method under a single configuration can accurately predict the aerodynamic performance of the same configuration within a large angle of attack range and the aerodynamic performance under different airfoil configurations. In the distributed ducted fan-wing coupled configuration test, this method also shows high accuracy and significant efficiency advantages, providing a reliable and efficient tool for predicting the aerodynamic performance of distributed ducted fan configu-rations.

Key words: Distributed ducted fan, aerodynamic performance, momentum source method, high efficiency and high precision