基于多孔介质燃烧的发动机理论热力循环分析

针对多孔介质发动机,建立了热力学理论模型,引入等温膨胀比,对经典的闭式和开式多孔介质发动机的热力循环过程进行分析,推导出多孔介质发动机热效率、循环功的计算公式,并采用压缩比系数建立了闭式和开式多孔介质发动机热力循环的关系.通过模拟计算,研究了传统发动机和闭式多孔介质发动机两种类型6种循环的理论热力过程,探讨其热效率、循环功随不同参数的变化及其与各参数之间的关系.分析发现,在理论热力循环中,闭式多孔介质发动机比传统发动机在循环功上有着较大优势,认为高速柴油机循环更适合采用多孔介质技术实现高效燃烧和超低排放.

Theoretical Thermodynamics Cycle Analysis of Porous Medium Combustion Based Engine

A theoretical thermodynamic cycle model was established with the expansion ratio of constant temperature as a parameter. Based on an analysis of the thermodynamic cycle of typical the closed and open porous medium(PM) engine, a formula of the thermal efficiency and cycle net work was derived. The relationship of thermodynamic cycle between the closed and open PM engine was defined with the compression ratio coefficient. Through calculation, six kinds of thermodynamic cycle of two types of traditional and the closed PM engine were studied, in which the variation and impact of thermal efficiency and cycle net work with the change of other parameters were deduced. The analysis results show that the net work of theoretical thermodynamic cycle of the closed PM engine is superior to that of the traditional engine. The high speed diesel engine cycle is found to be more suitable for PM technical scheme.