Optimization And Simulation Of General Aircraft Hybrid-Electric System

In recent years, general aircraft as urban transport has got more and more attention by people. With the opening of the low altitude areas, the quantity of general aircraft in China will increase. Traditional general aircraft consume fossil fuels, the disadvantage of pure electric aircraft is low battery energy density, and performance is inferior to conventional general aircraft. The general aircraft with hybrid-electric propulsion system has better performance in flight mission, Compared with traditional general aircraft, general aircraft with hybrid-electric propulsion produce less energy consumption and pollution. The environmental pollution, energy depletion and other issues have become increasing serious in China, the general aircraft with hybrid-electric propulsion have the potential and development prospects in the future.In this paper, German C42 plane has been adopted as prototype aircraft of the hybrid-electric aircraft. Refer to the hybrid-electric propulsion system which used in hybrid-electric cars. Optimization and simulation of general aircraft hybrid-electric system, aircraft fuel is efficient use in flight mission through optimize the hybrid-electric propulsion system, improve the flight performance and save fuel consumption. Because of the aircraft space and weight restrictions, the weight and output power of the piston engine and electric motor will be processed as important parameters in the process of the whole optimization simulation. The take-off weight of the hybrid-electric aircraft and the properties in each mission of the flight process keep invariability. Obtain the speed, output torque and power value in the performance test of piston engine and electric motor. Simulation models of the components in a hybrid-electric propulsion system were designed in the MATLAB Simulink environment, at the beginning of the design, the parts in the system were determined, the piston engine, electric motor, battery, fuel, transmission as independent separate modules, implement the whole simulation process by AeroSim Blockset. In order to improve flight efficiency, Mission Waypoint Optimization was used in the simulation process, this method is different from trajectory optimization or Flight Mission Planning in that Mission Waypoint Optimization deals with a pre-specified set of waypoint, rather than generating the waypoint. Use strategy of Mission Waypoint Optimization procedure to improve the fuel economy onboard a hybrid-electric aircraft.The electric motor can provide additional power and improve the Specific fuel consumption of piston engine by simulating flight mission, the output power of hybrid-electric propulsion system is higher than the prototype aircraft. The results show that a general airplane equipped with hybrid-electric propulsion system configuration is capable of achieving a fuel saving of 20%, the whole range increased by 15%, compared to the piston engine configuration. The performance of the hybrid-electric aircraft is better than the prototype plane.