李延吉,许多,宋瑞雯,等.掺氢天然气充量均质压燃发动机燃烧和排放特性的数值模拟研究[J].内燃机工程,2022,43(6):27-36.
掺氢天然气充量均质压燃发动机燃烧和排放特性的数值模拟研究
Numerical Simulation Study on Combustion and Emission Characteristics of Hydrogen Fueled Natural Gas Homogeneous Charge Compression Ignition Engines
DOI：10.13949/j.cnki.nrjgc.2022.06.004
关键词:掺氢天然气  内燃机  充量均质压燃  化学反应动力学
Key Words:hydrogen enriched natural gas  internal combustion engine  homogeneous charge compression ignition（HCCI）  chemical reaction kinetics
基金项目:辽宁省自然科学基金项目（20180550324）；辽宁省教育厅项目（L201707）
作者单位E-mail
李延吉* 沈阳航空航天大学 清洁能源利用辽宁省重点实验室，沈阳 110136 yanji0518@163.com 
许多 沈阳航空航天大学 清洁能源利用辽宁省重点实验室，沈阳 110136  
宋瑞雯 沈阳航空航天大学 清洁能源利用辽宁省重点实验室，沈阳 110136  
李明泽 沈阳航空航天大学 清洁能源利用辽宁省重点实验室，沈阳 110136  
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摘要:为研究掺氢对天然气充量均质压燃（homogeneous charge compression ignition， HCCI）发动机的燃烧及排放特性的影响，基于化学反应动力学软件包CHEMKIN中的零维模型模拟天然气HCCI发动机在掺氢比为0%~40%时的燃烧过程及排放，并对其进行数值分析。结果表明：掺入氢气后缸内温度和放热率先略下降后上升而缸内压力变化不明显，着火时刻随掺氢比增加不断提前，CO和CO2的生成浓度降低而NO的生成浓度上升。掺入氢气为体系提供大量H，使链分支和链传递反应加快，HO2和OH生成速度加快，造成着火时刻提前。NO的总生成速率随掺氢比增加而加快。
Abstract:In order to investigate the effects of hydrogen enrichment on the combustion and emission formation processes of natural gas homogeneous charge compression ignition（HCCI） engines， based on the chemical kinetics software of CHEMKIN， a single-zone model was used to calculate the in-cylinder processes of natural gas HCCI engine fueled with different hydrogen fractions （from 0% to 40% in volumetric fraction）. The numerical results show that the trend of change in the in-cylinder temperature and heat release rate after adding hydrogen shows a slight decrease at first and then an increase. However， the effect of adding hydrogen on the in-cylinder pressure is not obvious. And the increase in the ratio of hydrogen incorporation leads to an earlier ignition time. As the hydrogen doping ratio increases， the mole fractions of CO and CO2 decrease while the mole fraction of NO shows an opposite trend. A large amount of H is supplied to the system after adding hydrogen， which accelerates the chain branching and chain transfer reactions. And the generation rates of HO2 and OH are accelerated， resulting in an earlier ignition time. The total formation rate of NO increases with the increase of hydrogen doping ratio.
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