分布式电推进飞机气动-推进耦合特性地面试验

In the research on green aviation, the Distributed Electric Propulsion (DEP) aircraft shows great application potential because of its high energy efficiency in the propulsion system. However, compared with the traditional propulsion aircraft, the DEP aircraft suffers from strong aerodynamic-propulsion coupling phenomenon in flight. To explore the power system characteristics and aerodynamic-propulsion coupling characteristics of the DEP aircraft, a set of low-cost ground test platform for the aerodynamic-propulsion system of the DEP aircraft is designed. Through the ground test, the performance of the power system is evaluated first, and then the aerodynamic performance and aerodynamic-propulsion coupling relationship of the DEP technology are studied by the ground test and numerical simulation. The results show that the boundary layer suction effect of the electric ducted fan accelerates the air flow on the upper wing, resulting in a larger pressure difference between the upper and lower wings and thus an increase of the lift. The backward movement of the aerodynamic center caused by the increase of lift should be paid attention to. The research results can provide a reference for the overall design of the DEP aircraft.