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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimer: 2150-766X
ISSN En ligne: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012005213
pages 165-180

EXPERIMENTS IN DILUTED PREMIXED TURBULENT STAGNATION FLAMES FOR GAS-TURBINE ENGINE APPLICATIONS

Sean D. Salusbury
Department of Mechanical Engineering, McGill University, Montreal, QC, H3A 2K6, Canada
Jeffrey M. Bergthorson
Department of Mechanical Engineering, McGill University, Montreal, QC, H3A 2K6, Canada

RÉSUMÉ

In general, turbulent combustion in gas-turbine engines occurs under conditions at which the smallest turbulent eddies are assumed to be smaller than the flame thickness but larger than the inner-layer thickness: the so-called thin reaction-zone regime. This study demonstrates a bench-top experimental technique to investigate turbulent combustion properties in this important regime, where the burning velocity of a flame is assumed to be a function of the mixture's laminar flame speed, turbulence intensity, diffusion coefficients, and the mean flame curvature. Experimental observation of turbulent counterflow flames in this thin reaction zone will be used to investigate properties of turbulent combustion and to test the applicability of turbulent burning velocity predictions. High-blockage plates upstream of a high-contraction ratio contoured nozzle are used to generate high-turbulence intensities of 20−40% in premixed methane-air flames. The experimental method makes use of two laser diagnostic techniques: (a) particle image velocimetry to measure flow velocity and turbulence intensity; (b) planar Rayleigh scattering to measure progress variable and flame-front curvature. The measured burning velocities in the thin reaction-zone regime are then determined and compared to those predicted by a previously proposed correlation and by the flamelet model. Further, the burning velocities of methane-air flames are investigated with carbon dioxide dilution to investigate the effect of varying laminar flame speed independent of turbulence intensity. Intense turbulence will bring this study into the scope of gas-turbine engines and a compact experimental apparatus allows both higher experimental resolution and simulation at lower computational cost.


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