重庆大学学报2025，Vol.48Issue(7)：85-93,9.DOI:10.11835/j.issn.1000-582X.2025.07.008
二甲醚掺混对氨/空气预混燃烧特性的影响
Effect of dimethyl ether addition on NH3/air premixed flames
摘要
Abstract
To improve the ignition and combustion performance of NH3 in engines,blending it with the high-reactivity-fuel dimethyl ether(DME)is an effective strategy.This study conducts simulations of NH3/DME/air premixed laminar flames to investigate the effects of DME addition on key combustion characteristics,including laminar flame speed,reaction pathways,and NO formation.The results show that both the adiabatic flame temperature and the laminar flame speed increase significantly with higher DME blending ratios.A strong correlation is observed between laminar flame speed and the concentration of reactive free radicals,suggesting that the increased radical concentration due to DME is the main contributor to the enhanced flame speed.Furthermore,the normalized NO concentration in the flame rises significantly with increasing DME content,reaching approximately 50%when the DME blending ratio reaches 80%.Reaction pathway analysis indicates that DME addition inhibits the conversion of nitrogen species to N2,thereby leading to increased NO emissions.Sensitivity analysis shows that DME significantly alters the dominant elementary reactions.As the DME ratio increases,the sensitivity of nitrogen-group reactions considerably declines,while hydrogen-and carbon-group reactions increasingly govern the combustion process of the blended fuel.关键词
氨/反应动力学/二甲醚掺混/层流燃烧速度/反应路径Key words
ammonia/reaction kinetics/dimethyl ether blending/laminar flame speed/reaction pathways分类
能源科技引用本文复制引用
李天喜,陈朝阳,康琦,张达..二甲醚掺混对氨/空气预混燃烧特性的影响[J].重庆大学学报,2025,48(7):85-93,9.基金项目
国家自然科学基金资助项目(51506010) （51506010）
陕西省自然科学基金资助项目(2020JM-243).Supported by National Natural Science Foundation of China(52506010),and Natural Science Foundation of Shaanxi Province(2020JM-243). （2020JM-243）
