Analysis of Exergy Destruction Characteristics in Laminar Premixed Dual Flames of Dimethyl Ether

MI Xiaoqing; LI Gesheng; MI Xiaoxiong; ZHOU Mengni; LIU Biao; DOU Xiaoyu; ZHANG Zunhua

doi:10.7652/xjtuxb202603008

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Analysis of Exergy Destruction Characteristics in Laminar Premixed Dual Flames of Dimethyl Ether

更新时间：2026-03-09

- Analysis of Exergy Destruction Characteristics in Laminar Premixed Dual Flames of Dimethyl Ether
- Journal of Xi'an Jiaotong University Vol. 60, Issue 3, Pages: 77-85(2026)
- 作者机构：
  
  武汉理工大学船海与能源动力工程学院，430063，武汉
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202603008
  CLC： TK16
- Received：19 March 2025，
  
  Published：10 March 2026
- 稿件说明：
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MI Xiaoqing, LI Gesheng, MI Xiaoxiong, et al. Analysis of Exergy Destruction Characteristics in Laminar Premixed Dual Flames of Dimethyl Ether[J]. Journal of Xi'an Jiaotong University, 2026, 60(3): 77-85.
DOI：

MI Xiaoqing, LI Gesheng, MI Xiaoxiong, et al. Analysis of Exergy Destruction Characteristics in Laminar Premixed Dual Flames of Dimethyl Ether[J]. Journal of Xi'an Jiaotong University, 2026, 60(3): 77-85. DOI： 10.7652/xjtuxb202603008.

摘要

为研究发动机先进燃烧模式中的低温燃烧过程，解析二甲醚（DME）低温燃烧过程中的能质转换机制，针对不同当量比、氮气摩尔分数、初始压力和初始温度条件下DME/O

混合物层流预混双火焰的产生条件、双火焰结构、化学反应路径以及熵产特性的进行了研究，进一步解析了不同初始工况下双火焰的㶲损特性，揭示了低温燃烧双火焰阶段能量损失的关键因素。结果表明：低压、低温和富燃工况下二甲醚层流预混双火焰特征显著，该工况下火焰结构和熵产率沿火焰轴向距离均呈现“双峰”的变化趋势，即具有两个峰值；CH

OCH

和HO

自由基摩尔分数升高，双火焰反应熵产率及总熵产率增大；当压力为0.2 MPa、N

摩尔分数为30%、温度从300 K增加至450 K时，当量比为5时的传热㶲损率降低了41.2%，当量比为10时的传热㶲损率降低了52.4%。该研究可为调控发动机低温燃烧过程、优化发动机燃烧策略提供参考。

Abstract

To investigate the low-temperature combustion process in advanced engine combustion modes and analyze the energy-mass conversion mechanism during the low-temperature combustion process of dimethyl ether (DME)

this study systematically examines the generation conditions

double flame structure

chemical reaction pathways

and entropy production characteristics of laminar premixed double flame inDME/O

mixtures under varying equivalence ratios

nitrogen mole fractions

initial pressures

and initial temperatures.The exergy destruction characteristics of double flame under different initial operating conditions are further a

nalyzed

revealing the key sources of energy loss during the double-flame stage of low-temperature combustion.The results indicate that double flame characteristics are most pronounced under lowpressure

low-temperature

and fuel-rich conditions

with both flame structure and entropy production rate exhibiting a “double peak”trend along the axial flame direction

characterized by two distinct peaks.Elevated mole fractions of CH

OCH

and HO

radicals enhance the reaction entropy production rate and total entropy production rate in double flames.When pressure is 0.2 MPa and N

mole fraction is 30%

increasing the temperature from 300 K to 450 K reduces the heat transfer exergy destruction rate by 41.2% for an equivalence ratio of 5 and by 52.4% for an equivalence ratio of 10.This study provides valuable insights for regulating low-temperature combustion processes in engines and optimizing engine combustion strategies.

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