Flow and flame dynamics of confined buoyant inverse diffusion flames

Xuren Zhu, Xi Xia, Peng Zhang

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

Abstract

PIV experiments and simulation were performed to investigate non-reacting and reacting buoyant inverse diffusion flames, with emphasis on flow and flame dynamics. The results show that in non-reacting inverse diffusion flames the initial shear flow and the buoyancy effect induce opposite-direction vorticities, which interact with each other and cause flow instability. This instability can be quantified by the Richardson number, Ri, which measures the gravitational effect relative to the initial shear flow. So the instability is strongest at Ri = 1 when the two mechanisms of vorticity are comparable to each other. In the reacting inverse diffusion flame, the density gradient is reversed due to chemical heat release and so is the buoyancy-induced vorticity that it shares the same direction with the vorticity of the initial shear flow. As a result, the near-field flow instability is suppressed while the initial shear flow would continue growing under the gravitational effect until instability develops in the far field.

Original languageEnglish
Publication statusPublished - 1 Jan 2017
Event11th Asia-Pacific Conference on Combustion, ASPACC 2017 - University of Sydney, Sydney, Australia
Duration: 10 Dec 201714 Dec 2017

Conference

Conference11th Asia-Pacific Conference on Combustion, ASPACC 2017
Country/TerritoryAustralia
CitySydney
Period10/12/1714/12/17

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Chemical Engineering(all)

Cite this