多孔介质发动机工作过程单区模型模拟

采用单区燃烧模型模拟多孔介质（PM）发动机的压缩、燃烧和膨胀过程。以热力学第一定律为基础，引入多孔介质换热模型，建立了多孔介质发动机的能量方程。计算了多种工况参数下PM发动机缸内温度、压强变化规律，分别讨论了压缩比、过量空气系数、多孔介质温度、多孔介质体换热系数等参数对多孔介质发动机燃烧过程的影响。将PM发动机与传统发动机加以比较，结果表明PM使缸内温度和压强的变化趋于平缓，这有利于混合气着火并可降低NO，排放。

Working Process Simulation of PM Engine Using a Single-Zone Model

Porous medium(PM) was mounted into combustion chamber as the heat recuperator,and the working process of an engine is simulated by using a single-zone combustion model.An energy equation that incorporates a heat transfer model of porous medium is developed based on the first thermodynamic law.Pressure and temperature in the PM engine are calculated under various working conditions.Influences of operating parameters such as compression ratio,equivalence ratio,temperature and volumetric heat transfer coefficient of the porous medium on combustion process of the PM engine are analyzed.Comparison between PM engine and conventional engine shows that PM can decrease the variation of in-cylinder temperature and pressure,and is favorable to mixture ignition and NOx reduction.