Stability of Buoyant Inverse Diffusion Methane Flames with Confinement Effects

Xuren Zhu, Xi Xia, Peng Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Experimental and numerical studies were performed to examine the stability of inverse diffusion flames (IDFs) with the focus on the boundary wall effects. A regime diagram for flame stability was obtained based on the visual characteristics of flames and verified by the simulated flow fields. The boundary wall effects were identified and investigated by simulating the IDFs with different outer burner diameters. It was found that the wall-bounded induced shear flows either reduce the flow instability by vorticity diffusion or enhance it by vorticity convection. Based on the experimental and numerical observations, the mechanism of the boundary wall effects on the stability of buoyant IDFs was explained and further extended to general diffusion flames.

Original languageEnglish
JournalCombustion Science and Technology
DOIs
Publication statusAccepted/In press - 1 Jan 2019

Keywords

  • buoyant flame
  • instability
  • Inverse diffusion flame
  • vortex dynamics
  • wall effects

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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