【摘要】 为了对气动发动机进行效率分析和参数整合与优化,提高发动机的工作效率和经济性,提出一个能代表气动发动机工作过程、特征明显的理想热力循环.利用变质量热力学理论对该循环建模,分析了不同工作参数和气缸的几何参数对气动发动机工作过程的影响.提出并推导了4个效率评价指标以从不同角度评价气动发动机的工作状况.经过多目标规划计算后得到了气动发动机在最佳工况时的工作参数和气缸的几何尺寸.分析结果表明,当进气压比为32,气缸压缩比为13时,系统的效率最高,而进气温度对优化结果没有影响.更多还原

【Abstract】 To analyze the efficiency of air powered engine and parameters integration,an ideal cycle closely resembling the actual cycle was represented by keeping the complexities at a manageable level and utilizing some idealizations.The simple idealized model was expressed by changeable mass model which made analytical study of the cycle feasible.The effect of the input state and cylinder geometry was obtained from the model.To determine the optimal working parameters,4 efficiency indicators were used to evaluate the engine’s performance from different views.After multi-objective optimization pressure ratio equaling 32 and compression ratio equaling 13 were obtained.The conclusion that the input temperature does not affect the optimization result was reached in the end.更多还原