二甲醚燃烧机理简化与燃烧特性验证
Mechanism simplification and combustion characteristics verification of dimethyl ether combustion
滕霖 1单志伟 1李卫东 1尹鹏博1
作者信息
- 1. 福州大学 化工学院,福建 福州 350108
- 折叠
摘要
二甲醚(DME)作为燃料具有来源广、可再生和低碳等优点,已成为最具潜力的内燃机和燃气轮机替代燃料.然而,关于DME燃烧机理的研究仍然不够深入.通过使用带有误差传播和敏感性分析的有向关系图法(DRGEPSA)对现有的高压条件下的DME燃烧详细机理进行简化获得了骨架机理(Mech_191),然后通过调整指前因子对Mech_191进行优化获得了简化机理.将应用简化机理获得的指征DME燃烧的重要参数(点火延迟时间和层流火焰速度)的预测值与文献值进行了对比.结果表明,简化机理的预测值与文献值高度吻合,验证了该机理在模拟DME燃烧特性方面的有效性.此外,还发现部分关键反应(如·CH3OCH2的消耗反应)的确定对于准确获取重要燃烧参数有重要作用.
Abstract
As a fuel,dimethyl ether(DME)has the advantages of wide source,renewable and low carbon,and has become the most potential alternative fuel for internal combustion engine and gas turbine.However,the research on the combustion mechanism of DME is still insufficient.The skeleton mechanism(Mech_191)was obtained by simplifying the detailed mechanism of DME combustion under high pressure by using DRGEPSA method with error propagation and sensitivity analysis,and then the simplified mechanism was obtained by optimizing Mech_191 by adjusting the pre-exponential factor.The predicted values of the important parameters indicating DME combustion(ignition delay time and laminar flame velocity)obtained by the simplified mechanism were compared with those in the literature.The results show that the predicted values of the simplified mechanism are in good agreement with those in the literature,which verifies the effectiveness of the mechanism in simulating the combustion characteristics of DME.In addition,it is also found that the determination of some key reactions(such as the consumption reaction of·CH3OCH2)plays an important role in accurately obtaining important combustion parameters.
关键词
二甲醚燃烧机理/DRGEPSA方法/点火延迟时间/层流火焰速度Key words
dimethyl ether combustion mechanism/DRGEPSA method/ignition delay time/laminar flame speed引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据