Flame liftoff height dependence on geometrically modified bluffbodies in a vitiated flow

Wookyung Kim, Seong Kyun Im, Hyungrok Do, M. Godfrey Mungal

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In this study, the improvement of liftoff height of bluffbody-stabilized, partially premixed methane flames and the change of flow field in the recirculation zone of bluffbodies, of variously modified base geometries, are investigated in a high temperature (~1,315 K) vitiated flow. The basic geometry of the bluffbody consists of a two-dimensional rectangular body with a rounded nose with fuel jets being discharged from the body at several locations upstream of the base. Flame liftoff height measurements are characterized by CH chemiluminescence, while the three-dimensional flow field is determined using stereo particle image velocimetry (PIV). The lowest liftoff height is observed when the geometric modifications from the original rectangular bluffbody base are carried out such that the base has three-dimensional local cavities together with two-dimensionally modified geometries. PIV measurements show that the improvement of liftoff height is primarily attributed to an intense recirculation induced by multi-dimensional vortex structures in the presence of the two- and three-dimensionally modified base.

Original languageEnglish
Pages (from-to)27-41
Number of pages15
JournalExperiments in Fluids
Volume49
Issue number1
DOIs
Publication statusPublished - 2010 Jul 1
Externally publishedYes

Fingerprint

flames
Velocity measurement
Geometry
Flow fields
particle image velocimetry
flow distribution
Chemiluminescence
geometry
Jet fuel
Methane
jet engine fuels
three dimensional flow
chemiluminescence
Vortex flow
upstream
methane
vortices
methylidyne
cavities
Temperature

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Flame liftoff height dependence on geometrically modified bluffbodies in a vitiated flow. / Kim, Wookyung; Im, Seong Kyun; Do, Hyungrok; Mungal, M. Godfrey.

In: Experiments in Fluids, Vol. 49, No. 1, 01.07.2010, p. 27-41.

Research output: Contribution to journalArticle

Kim, Wookyung ; Im, Seong Kyun ; Do, Hyungrok ; Mungal, M. Godfrey. / Flame liftoff height dependence on geometrically modified bluffbodies in a vitiated flow. In: Experiments in Fluids. 2010 ; Vol. 49, No. 1. pp. 27-41.
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