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An experimental study of recirculation zones on a bluff-body stabilized nonpremixed flame Prapti Mahandari Mechanical Engineering, Engineering Faculty,

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Presentation on theme: "An experimental study of recirculation zones on a bluff-body stabilized nonpremixed flame Prapti Mahandari Mechanical Engineering, Engineering Faculty,"— Presentation transcript:

1 An experimental study of recirculation zones on a bluff-body stabilized nonpremixed flame Prapti Mahandari Mechanical Engineering, Engineering Faculty, University of Indonesia

2 Theory: Motivated by the LES work of Kempf et al, 2005 (and similar) –Bluff –body increase turbulence flow –“Turbulence kinetic energy is insufficient in the context of Smagorinsky subgrid model combine with the dynamic procedure of Germano Experiment: Sidney Bluff-Body Burner, 1998 –Velocity and scalar statistic –Structure of the recirculation zone is depend on the flow field

3 Bluff-Body Stabilized Nonpremix Flame Quartz Tube: Insulation: Blanket, ‘Jacketed’ Tube, Heat Exchanger Injectors& Bluff-body Fuels: H 2, C 2 H 2, C 2 H 4, n-C 7 H 16 OPTICAL MEASUREMENT IMAGE AND SPECTROSCOPY Quartz Tubes: Insulation: Blanket, ‘Jacketed’ Tube Injector & 3 Bluff-bodies: Fuels: C 2 H 4 only OPTICAL MEASUREMENT IMAGE AND SPECTROSCOPY Fixed Bluff-body3 Different Bluff-Bodies Schema

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5 OBJECTIVES Aforementioned results are not entirely consistent This is a reflection of a more general situation: –Insufficient current knowledge concerning,Thermodynamic of flame in the recirculation zone –Limited number of relevant, well characterized experiments for validation – THUS – In order to understand the fundamental underlying physics of the coupling between a bluff body and the recirculation zone, we experimentally: –Observe the recirculation zone on the bluff-body –Investigate the themodynamic properties of flame of the bluff-body –Results directly available for comparison with the LES

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7 INDEPENDENT VARIABLES: EXPERIMENTAL ACCURACY

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