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

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Abstract

Quantitative hydroxyl time-series measurements from a set of stable and extinguishing turbulent opposed-flow partially premixed CH4/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 mixture-fraction 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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Authors and Affiliations

  1. School of Mechanical Engineering, Purdue University, West Lafayette, 47907-1288, Indiana

    Krishna K. Venkatesan & Normand M. Laurendeau

  2. Department of Mechanical Engineering, University of Connecticut, Storrs, Connecticut, 06269-3139, USA

    Michael W. Renfro

  3. Department of Mechanical Engineering, Technical University Darmstadt, Darmstadt, Germany

    Dirk Geyer & Andreas Dreizler

Authors
  1. Krishna K. Venkatesan
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  2. Normand M. Laurendeau
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  3. Michael W. Renfro
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  4. Dirk Geyer
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  5. Andreas Dreizler
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Corresponding author

Correspondence to Krishna K. Venkatesan.

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“Time-Series Measurements in Turbulent Opposed-Jet Flames" is submitted for consideration as a full length article to Flow Turbulence and Combustion.

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Venkatesan, K.K., Laurendeau, N.M., Renfro, M.W. et al. Time-resolved measurements of hydroxyl in stable and extinguishing partially premixed turbulent opposed-jet flames. Flow Turbulence Combust 76, 257–278 (2006). https://doi.org/10.1007/s10494-006-9014-x

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  • DOI: https://doi.org/10.1007/s10494-006-9014-x

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