Time-dependent measurements of flame temperature and the OH radical in the unsteady extinction of non-premixed flames

Lee, Uen Do; Oh, Kwang Chul; Shin, Hyun Dong; Lee, Kiho

doi:10.1016/j.combustflame.2005.01.001

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…The OH radical has previously been shown to be a reasonable indicator of extinction for turbulent and unsteady counterflow nonpremixed flames [36].…”

Section: Extinction Studiesmentioning

confidence: 99%

Time-resolved measurements of hydroxyl in stable and extinguishing partially premixed turbulent opposed-jet flames

Venkatesan

Laurendeau

Renfro

et al. 2006

Flow Turbulence Combust

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Quantitative hydroxyl time-series measurements from a set of stable and extinguishing turbulent opposed-flow partially premixed CH 4 /air flames are used to investigate the effect of Reynolds number and fuel-side equivalence ratio on the structure of turbulent partially premixed flames. The hydroxyl (OH) integral time scale, computed from the autocorrelation function, is used to characterize OH fluctuations and is found to reach a minimum at the axial location of peak OH. Analyses of the duration of and period between bursts in the OH time series are used to examine the dynamics of flame-front motion. In general, with increasing Reynolds number (Re), the distribution in OH burst times shifts towards smaller time scales. A hydroxyl intermittency parameter is also defined from the bursts to quantify the presence or absence of OH. For flames with the same fuel-side equivalence ratio, the hydroxyl intermittency at peak OH remains almost constant when going from stable to extinguishing flames. However, histograms portray an increase in burst separation times for flames displaying occasional extinction events. Hydroxyl time series for a partially premixed flame at a fuel-side equivalence ratio of 2.0 and Re = 6650 are synthesized by using mixturefraction simulations based on calculated state relationships for OH versus mixture fraction (f). The laminar-flamelet model is employed to explore relations between OH and f so as to predict trends in mixture-fraction time scales.

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“…The OH radical has previously been shown to be a reasonable indicator of extinction for turbulent and unsteady counterflow nonpremixed flames [36].…”

Section: Extinction Studiesmentioning

confidence: 99%

Time-resolved measurements of hydroxyl in stable and extinguishing partially premixed turbulent opposed-jet flames

Venkatesan

Laurendeau

Renfro

et al. 2006

Flow Turbulence Combust

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show abstract

“…To provide highly repeatable flow-flame interactions, we use a pulsed counterflow burner. This burner configuration has been used extensively for investigating the transient response of the inner structure of non-premixed flames [10][11][12], ignition and extinction in unsteady flow [13,14], and the dynamics of edge-flame propagation [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of H2O and NO on extinction and re-ignition of vortex-perturbed hydrogen counterflow flames

Lee¹,

Yoo²,

Chen³

et al. 2009

Proceedings of the Combustion Institute

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Extinction limit extension of unsteady counterflow diffusion flames affected by velocity change

Lee

Shin

et al. 2006

Combustion and Flame

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Time-dependent measurements of flame temperature and the OH radical in the unsteady extinction of non-premixed flames

Cited by 5 publications

References 22 publications

Time-resolved measurements of hydroxyl in stable and extinguishing partially premixed turbulent opposed-jet flames

Time-resolved measurements of hydroxyl in stable and extinguishing partially premixed turbulent opposed-jet flames

Effects of H2O and NO on extinction and re-ignition of vortex-perturbed hydrogen counterflow flames

Extinction limit extension of unsteady counterflow diffusion flames affected by velocity change

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