直喷式柴油机缸内过程的能量可用性分析

本文以柴油机工作过程的热力学第一定律数值模拟为基础，应用热力第二定律分析一台直喷式柴油要的缸内过程的能量可用性。通过各过程的能量可用性平衡分析，定量地计算了能量作功能力和不可逆损失，并且与势和不第一定律的能量平衡进行了比较；分析计算了直喷式柴油机的循环喷油量、燃烧开始角、燃烧持续期、燃烧品质指标及气缸绝热对缸内能量可用性和热力学第一定律、第二定律热效率的影响。

Availability Analysis of In Cylinder Processes for a Direct Injection Diesel Engine

In this paper availability of in cylinder processes for a direct injection engine is analysed by use of thermodynamic Second Law,which is based on a simulation model of the engine cycle by First Law analysis.The energy available for doing work and irreversible loss are quantified by the avai lability balance,and compared with First Law energy balance.A parameter study is carried out.The effects of fuel amount injected per cycle,burning start angle,burning duration,burning rate shape factor and cylinder thermal insulation on in cylinder availability,First Law and Second Law efficiency are calculated.