The effects of CH4 addition on DME non-premixed cool flames

Rui Zhang, Christopher B. Reuter, Yiguang Ju

Research output: Contribution to conferencePaper

Abstract

Methane has poor reactivity at low temperatures, which limits its utilization in internal combustion engines. However, this issue can be remedied through the use of DME/CH4 blends. In this paper, the effects of CH4 addition on DME non-premixed cool flames are investigated. The extinction limits and flame structures of both hot and cool flames are measured using a counterflow burner and planar laser-induced fluorescence (PLIF). The experimental results show that steady DME/CH4 non-premixed cool flames can be established in a counterflow burner. It is found that the addition of CH4 into DME reduces the extinction strain rates of cool flames but increases the extinction strain rates of hot flames. Furthermore, the peak CH2O mole fraction in both hot and cool flames decreases as the CH4 mole fraction increases. Several DME/CH4 reaction mechanisms are compared with the experimental data. Modeling results using the mechanism of Wang et al. show the most agreement with the experimental trends, but a significant quantitative disagreement is still apparent for the low-temperature cool flames.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event10th U.S. National Combustion Meeting - College Park, United States
Duration: Apr 23 2017Apr 26 2017

Other

Other10th U.S. National Combustion Meeting
CountryUnited States
CityCollege Park
Period4/23/174/26/17

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

Keywords

  • Cool flame
  • Dimethyl ether
  • Kinetic effect
  • Methane
  • Non-premixed counterflow flame

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  • Cite this

    Zhang, R., Reuter, C. B., & Ju, Y. (2017). The effects of CH4 addition on DME non-premixed cool flames. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.