Abstract: This paper proposes a kind of distributed electric-propelled propeller aircraft, which uses the second-order precision k-ω Shear-Stress-Transport (SST) turbulence model to solve the RANS equation, and uses the Multiple Reference Frame (MRF) method to carry out numerical simulation for the low-speed characteristics, and this paper obtains the influence of the distributed propeller slipstream effect on the aerodynamic characteristics of the entire aircraft. The results show that the slip flow state increases the lift and drag of the whole aircraft, the maximum increment of lift coefficient is more than 65%, and the lift increment increases with the increase of angle of attack. The slip flow improves the stall performance, and increases the head-down moment. Meanwhile the rotation of the propeller increases the circumferential speed, changes the radial speed distribution, increases the axial speed, and the high-energy propeller slipstream changes the local lift and drag characteristics of the wing; the result also shows the airflow of the propeller blades rotates upwards, and the local angle of attack increases due to the up washing effect on one side, while the local angle of the attack on the other side decreases. The rotation direction of the propeller has a great influence on the surface pressure distribution of the wing on both sides of the propeller; especially the wingtip propeller has a great influence on the aerodynamic performance of the whole aircraft.

Key words: distributed, electric aircraft, multiple reference frame, slipstream effect, aerodynamic performance, pressure distribution