Low-Temperature multistage diffusion flames

Omar R. Yehia, Christopher B. Reuter, Yiguang Ju

Research output: Contribution to conferencePaperpeer-review


We demonstrate the existence of steady low-Temperature multistage diffusion flames in the counterflow configuration and examine their character as well as that of premixed flames. The character of both diffusion and premixed multistage flames is such that intermediates are produced and consumed in separate oxidation layers. For hydrocarbon fuels in thermodynamic conditions of practical interest, there exist three distinct temperature-dependent classes of reactions that dictate three different oxidation stages, namely low-Temperature peroxy chemistry, intermediate-Temperature chemistry, and high-Temperature small radical chemistry. For ethers of practical interest, such as diethyl and dibutyl ether, the intermediate-Temperature stage is pronounced owing to the additional contribution of the intermediates produced from the scission of the fuel radical, along with the intermediates produced from the decomposition of ketohydroperoxide. For both non-premixed and premixed flames, multistage flames exist for intermediate Damköhler numbers, limited by the classical high-Temperature hot flame in the limit of large Damköhler number and a single-stage low-Temperature cool flame in the limit of small Damköhler number approaching that of extinction. An abrupt transition between the two-stage flame and single-stage hot flame occurs, whereas a smooth transition between both flames occur for rich premixed flames, for the conditions considered.

Original languageEnglish (US)
StatePublished - 2018
Event2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 - State College, United States
Duration: Mar 4 2018Mar 7 2018


Other2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018
Country/TerritoryUnited States
CityState College

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • General Chemical Engineering


  • Cool flame
  • Counterflow.
  • Low-Temperature chemistry
  • Multistage diffusion flame


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