二甲醚、乙醇和甲烷均质压燃的模拟比较  

Comparing simulations of HCCI combustions running on DME,ethanol,or methane

作　　者：左承基[1] 黎幸荣[1] 章炜[2] 任荣社[2] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230601 [2]海军蚌埠士官学校机电系,蚌埠233012

出　　处：《热科学与技术》2009年第1期74-79,共6页Journal of Thermal Science and Technology

摘　　要：在相同条件下对二甲醚(methoxymethane,DME)、乙醇和甲烷进行均质压燃(homogeneous charge compression ignition,HCCI)燃烧的模拟,改变压缩始点的缸内温度及压力、压缩比、燃空当量比中的一个以考察其对三种燃料HCCI燃烧过程的影响。随着压缩始点温度和压力、压缩比的提高,三种燃料的着火时刻都提前;提高燃空当量比,DME的着火时刻提前,而甲烷和乙醇则相反;三种燃料低温下的主要脱氢途径都是与OH自由基发生的脱氢反应;三种燃料实现HCCI燃烧的条件不一样,模拟结果给出了大致的趋势。Running the simulations of HCCI combustion fueled with DME, Ethanol or Methane at different initial temperature, initial pressure, compression ratios or fuel-air ratios respectively, their effect on HCCI combustion process was studied. It can be found that increasing the initial temperature or initial pressure or compression ratio will advance the ignition time. Increasing fuel-air ratio will advance the ignition time of combustion running on DME, while delaying the time on Methane and Ethanol. Reaction with radical H is the main way for all three fuels to abstract H at lower temperature. The running conditions for these three fuels to perform HCCI combustion are different.

关 键 词：均质压燃 二甲醚 乙醇 甲烷 模拟 

分 类 号：TK46[动力工程及工程热物理—动力机械及工程]