Structures and stability of lifted combustion zones in preheated oxidizer

Jiongming Ruan, Hideaki Kobayashi, Takashi Niioka, Abudula Abuliti, Fumio Iida

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The structures and stability of lifted combustion zones have been simulated with detailed chemistry and transport properties in an axisymmetric laminar fuel (CH 4) jet and outer co-flow of the (O 2 + N 2) oxidizer whose initial temperature is 300 K, 700 K and 1 200 K. A set of numerical simulations was executed by increasing the N 2 dilution ratio, Z (mole fraction of N 2 in the oxidizer). The results showed that at 300 K, the lifted combustion zone had a triple flame structure where the rich premixed wing is smaller than the lean one and the trailing diffusion flame immediately inclined to the fuel side from the triple point as well as the leading edge of the triple flame was shifted away from the jet axis as Z increased. As the initial temperature increased, the combustion zones were lifted at larger Z values than the one at 300 K. Especially, for 1 200 K, it was found that the lifted combustion zones, when expressed in terms of the heat release rate, have become so weak that a flameless triple combustion zone was formed due to the high dilution ratio and high preheat temperature. The numerical simulations on the response of the lifted triple combustion zone to the initial fuel velocity were also carried out, and the results showed that the lifted combustion zone using a high preheated temperature was very stable in the near field.

Original languageEnglish
Pages (from-to)499-505
Number of pages7
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume45
Issue number3
DOIs
Publication statusPublished - 2002 Aug

Keywords

  • Flame structure and stability triple flame
  • Laminar lifted flame
  • Numerical simulation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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