王浒，马春山，王洋，尧命发.灵活缸重整模式下低温重整产物对压燃式发动机燃烧和排放影响的数值模拟研究[J].内燃机工程,2019,40(4):51-57.
灵活缸重整模式下低温重整产物对压燃式发动机燃烧和排放影响的数值模拟研究
Numerical Simulation of Influence of Fuel Low-Temperature Reforming Products on Combustion and Emissions in Flexible Cylinder Engine Mode
DOI：10.13949/j.cnki.nrjgc.2019.04.008
关键词:灵活缸  重整  第一参比燃料  低温  发动机
Key Words:flexible cylinder  reforming  primary reference fuel  low temperature  engine
基金项目:国家自然科学基金重大研究计划资助项目(91541205)；国家自然科学基金项目(5150615)
作者单位
王浒，马春山，王洋，尧命发 天津大学 内燃机燃烧学国家重点实验室，天津 300072 
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摘要:采用数值模拟方法研究了第一参比燃料(PRF50)的低温重整过程及其产物对压燃式发动机燃烧和排放特性的影响。研究结果表明，PRF50燃料的低温重整区域随当量比的增加而增大，初始温度和压力的选择范围变化有限，并且PRF50燃料发生低温反应的触发界线开始向较高的初始进气温度方向移动；初始进气温度和当量比对重整过程的影响要大于初始压力的影响；PRF50燃料的低温重整产物均可使PRF50燃料均质充量压燃的燃烧相位提前，且重整产物的加入改善了发动机有害排放中一氧化碳、未燃碳氢和氮氧化物的排放，指示热效率也可提高约3.0%。
Abstract:The effects of low-temperature reforming process and reforming products of PRF50 fuel(mixture of n-heptane and isooctane in 50% to 50% in volume) on the combustion and emissions characteristics of a homogeneous charge compression ignition(HCCI) engine were studied by numerical simulation. The results show that the ranges of the initial temperature and pressure of low-temperature reforming of PRF50 fuel are narrow with the increase in the equivalence ratio, and the reaction start point of low-temperature reforming of PRF50 fuel begins to move towards higher initial inlet temperature; moreover, the effects of the initial inlet temperature and equivalence ratio on low temperature reforming process are greater than the initial inlet pressure. The reforming products of PRF50 fuel can advance the engine combustion phase, and decrease the emissions of carbon monoxide(CO), unburned hydrocarbon(UHC) and nitrogen oxide(NOx ). The indicated thermal efficiency is improved by about 3.0%.
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