摘要
在定容燃烧弹中系统地研究了常温常压下,不同稀释气、不同稀释系数、不同燃空当量比时二甲醚—空气—稀释气混合气的燃烧特性。基于容弹计算的准维双区模型和实测的燃烧压力数据,计算了燃烧温度及规范化质量燃烧速率。研究结果表明:随着稀释系数的增加,最大燃烧压力值、最高燃烧温度值以及规范化质量燃烧速率均降低,而火焰发展期和快速燃烧期随稀释系数的增加而增加。研究发现,CO2作为稀释气体时对燃烧温度降低的效果较N2作为稀释气体时更加明显。
Combustion characteristics of dimethyl ether-air-N2/CO2 premixed mixtures were studied in a constant volume bomb under different dilution ratios and equivalence ratios at room temperature and atmospheric pressure. N2 and CO2 were used as the diluents for the dimethyl ether-air mixture premixed combustion. The gas temperature and the normalized mass burning rate were calculated based on a two-zone model and the recorded pressure data. The results show that the peak combustion pressure, the normalized mass burning rate, the maximum temperature of the burned gases show the decrease with the increase of dilution ratio whereas the flame development duration and the rapid combustion duration increase with the increase of the dilution ratio. CO2 presents the larger influence on combustion temperature than that of N2 as the diluent in the dimethyl ether-air-diluent mixture combustion.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2008年第3期207-213,共7页
Transactions of Csice
基金
国家自然科学基金重点项目(50636040)
国家自然科学基金创新群体项目(50521604)
优秀国家重点实验室项目(50323001)
关键词
二甲醚
燃烧特性
稀释
Dimethyl ether
Combustion characteristics
Dilution
