Design And Performance Analysis Of Distributed Oil-Electricity Combined UAV

After a comprehensive analysis of the advantages and disadvantages of the fuel-powered,electric-powered and the hybrid UAVs,this paper designed a new type of combined-electric UAV which has a distributed layout.The UAV not only kept the high energy density of the fuel to ensure the battery life and load capacity,but also utilized the slipstream effect of the propeller to fully exploit the potential of the integrated design of the distributed electric propulsion system and the aerodynamic characteristics of the wing,so that it can reduce the Weight of power system and wing structure.Specifically,this paper redesigned its powertrain and wings on the basis of an ultra-light electric aircraft,used several propellers which were driven by some motors placed on the leading edge of the wing and a Piston engine which arranged at the nose of the aircraft with its single-propeller system to replace the single-power motor-driven single-propeller power system of the reference model,the system was driven by Piston engine independently.Based on the theory of momentum and numerical simulation of CFD,the influence of the slipstream generated by the propellers at different positions on the wing on the aerodynamic force of the wing was analyzed,the position where can greatly improve the aerodynamic efficiency was find out,and the geometrical parameters of the corresponding wing were redesigned,at last a comprehensive design method of the distributed propulsion system parameters and wing geometry parameters was proposed.The dynamic parameters of the distributed hybrid power system were matched.The optimal number of motors and the power of a single motor was determined.The propeller which matched with the motor was selected and the suitable piston engine was chosen.The capacity of the battery and the fuel tank was determined,and the wing form corresponded to the program was designed.The total weight of the aircraft,the distance of take-off and landing,the climb rate,the mobility,the battery life and other performance indicators were analyzed and compared with the characters of the prototype.The feasibility and superiority of this system are verified from the aspects of power,structure weight,cruising time and the voyage,and then the practical significance and development prospect of developing distributed oil-electricity combined power UAV were demonstrated.It will provide a reference for the future study of the workers who works in the area of distributed oil and electric combined power UAV.