混合动力, 压缩空气, 内燃机, 数值模拟

A new hybrid compressed-air and fuel engine was chosen as the research object. The new hybrid engine was modeled using the thermodynamics theories,which can work by both four-stroke compressed-air powered engine mode and internal-combustion engine mode and the simulation analysis was made in its operating characteristics. The simulation results show that the four-stroke compressed-air powered engine mode possesses preferable economic performance and torque characteristics when the engine rotating speed is below 1500r/min; the internal-combustion engine mode possesses better economic performance and torque characteristics when the rotating speed is between 1500r/min and 3500r/min. So the four-stroke compressed-air powered engine mode is fit to run at low speed or low load, and the internal-combustion engine mode is fit to run at high speed or high load. 