分布式涵道风扇喷流对后置机翼的气动性能影响

Based on the research of the Vertical Take-Off and Landing (VTOL) Unmanned Aerial Vehicles (UAVs) with Distributed Electric Propulsion (DEP), high-precision quasi-steady numerical simulation of the jet flow aerodynamic effects of different DEP-wing configurations are conducted using the Reynolds-Averaged Navier-Stokes (RANS) equations of the Multiple Reference Frame (MRF)/Momentum Source Method (MSM) based on the hybrid grid technology and k-ω SST turbulence model. The reliability and efficiency of the numerical method under the zero-velocity freestream condition are verified by the experiment of solo ducted fan/ducted fan and wing configurations. The aerodynamic advantages of the DEP-wing configuration are then analyzed. Finally, the rotating speed, spacing of the DEP and the rotating direction of the ducted fan are numerically simulated. Results show that the aerodynamic characteristics of the wing are significantly improved by the jet coupling effect of the DEP, compared with the solo ducted fan; the aerodynamic characteristics of the wing are similar at different rotating speeds of the DEP; the dynamic characteristics of the ducted fan will be improved with the increase of the spacing of the DEP, while those of the wing will be reduced; the reasonable rotation direction of the ducted fan enables smoother high pressure transition in the lower wing jet area and more continuous static pressure values; in addition, the inner ducted fan is motivated by the side jet flow, producing a better induction effect on the lift characteristics of the wing.