Effect of pressure on the characteristics of lifted flames

Seunghwan Bang, Byeong Jun Lee*, Suk Ho Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The effects of pressure on the characteristics of lifted flames in a coflow with propane fuel were investigated experimentally in a pressure chamber. Changing the pressure influenced the density, reaction kinetics, and flame propagation speed. The pressure range tested was P?=?0.5-5.5atm. As the fuel jet velocity increased, a nozzle-attached flame transitioned to a lifted flame before blowout occurred. Depending on pressure, the onset conditions of liftoff and blowout occurred in the laminar, transition, or turbulent regimes. When P<1.6atm, the flame was lifted and had a tribrachial edge structure in the laminar regime, and the liftoff height (H L ) increased with increasing pressure. Both the liftoff and blowout velocities decreased with decreasing pressure, and they merged at 0.5atm. A correlation was derived in terms of the Schmidt number (Sc) and the Reynolds number (Re): Pn2(HLPn12Sc1? Re. The reattachment velocity in the laminar and transition regimes linearly decreased with pressure. The liftoff height had two local minimum points at given Reynolds number in the transition regime, and then increased linearly in the turbulent regime.

Original languageEnglish (US)
Pages (from-to)2013-2020
Number of pages8
JournalProceedings of the Combustion Institute
Volume37
Issue number2
DOIs
StatePublished - 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: SHC was supported by King Abdullah University of Science and Technology (KAUST).

Keywords

  • Laminar flame
  • Lifted flame
  • Pressure
  • Transition
  • Turbulent flame

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Effect of pressure on the characteristics of lifted flames'. Together they form a unique fingerprint.

Cite this