甲醇内燃机变工况仿真研究

Investigation on Numerical Simulation of Methanol-Internal Combustion Engine

在各种不同工况下,内燃机性能和排放会有很大的不同,尤其是甲醇作为一种汽油的替代燃料,燃烧特点与汽油有很大不同。为研究甲醇内燃机在各种内燃机工况下的燃烧性能,为了提高燃烧效率,采用先进的KIVA-3V仿真平台,建立了三维内燃机燃烧模型,通过改变内燃机的点火提前角、负荷和转速的仿真试验,研究了这三种变工况下甲醇燃烧的动力性和排放指标。结果表明,增大点火提前角,缸内压力、温度升高,CO_2、NO_X的含量也随之增大;增大负荷,缸内压力、温度升高,使CO_2、NO_X的含量也随之升高,振动加剧;提高转速,温度、压力降低,CO_2、NO_X的含量也随之降低。仿真结果为设计提供了依据。

Based on advanced simulation platform KIVA - 3V,a three - dimensional model of the internal combustion engine combustion is established.By changing the internal combustion engine advanced ignition angle,load and speed simulation test,power and emissions of methanol at three mutative modes are ananlysed.The results show that,increasing the ignition advance angle,cylinder pressure,and temperature,the concentration of CO2,NOX also increases;increasing load,cylinder pressure,and temperature,the concentration of CO2,NOX also and vibration also increased,and improving speed,and depressing temperature and cylinder pressure,the concentration of CO2, NOX also decreased.