压缩空气/燃油混合动力发动机工作特性的数值模拟

以一种四行程压缩空气/燃油混合动力发动机为研究对象,应用热力学理论建立了它的两种工作模式———四行程压缩空气动力模式和内燃机模式的数学模型,并对两种工作模式的工作特性进行了仿真研究。仿真结果表明,转速在低于1500r/min时,四行程压缩空气动力模式具有良好的经济性和动力性能;转速在1500～3500r/min范围内时,内燃机模式具有良好的经济性和动力性能。故知,四行程压缩空气动力模式适宜在低速、低负荷时运行,而内燃机模式适宜在高速、大负荷时运行。

Numerical Simulation on Operating Characteristics of Hybrid Compressed-air and Fuel Engine

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.