Dynamics of bluff-body-stabilized premixed hydrogen/air flames in a narrow channel

Bok Jik Lee, Chun Sang Yoo, Hong G. Im

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Two-dimensional direct numerical simulations were conducted for bluff-body stabilized flames of a lean hydrogen/air mixture at near-blowoff conditions in a meso-scale channel. Parametric simulations were conducted by incrementally varying the inflow velocity in the vicinity of the blowoff limit, and the corresponding flame response was monitored. The present study is a showcase of combustion DNS with embedded boundary representation, and full demonstration of the detailed visualization of the near-blowoff flame characteristics. As the inflow velocity approaches blowoff limit, the flame dynamics exhibit a complex sequence of events, such as periodic local extinction and recovery, and regrowth of the bulk flame by the flame segments attached behind the bluff-body. The total extinction is observed as the attached flames shrink down and are no longer able to regrow the bulk flames. Despite the disparity in the physical scale under study, the observed sequence of the extinction pathway shows a strong similarity with experimental observations at larger scale combustion systems. © 2015 The Combustion Institute.
Original languageEnglish (US)
Pages (from-to)2602-2609
Number of pages8
JournalCombustion and Flame
Volume162
Issue number6
DOIs
StatePublished - Jun 2015

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Dynamics of bluff-body-stabilized premixed hydrogen/air flames in a narrow channel'. Together they form a unique fingerprint.

Cite this