内燃机性能指标的简化计算

Simplified Calculation for Performance of Internal Combustion Engine

循环热效率和指示热效率是两个不同的热效率概念 ,本文推导出了两种热效率之间相互换算的因子———“热效率修正因子”的计算式 ,应用该因子可以计算或预测内燃机实际循环的性能指标 ,计算结果与热计算结果吻合 ,该方法比热计算简单 ,适用于所有四冲程内燃机。

Cycle thermal efficiency and indicated thermal efficiency are different two conceptions of thermal efficiency. This paper derived a inter-relation between cycle thermal efficiency and indicated thermal efficiency ' thermal efficiency modified factor'. By using the factor, performance indices of internal combustion engines are calculated or predicted. The calculation results are in agreement with the thermal calculation results. This method is simple, and can be applied to all four-stroke internal combustion engines.