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Experimental Study of Recirculation Zones on Bluff-Body Stabilized Nonpremixed Flames

This study investigates the characteristics of recirculation zones on a bluff-body stabilized nonpremixed flame, motivated by turbulence modeling insights from previous works. Conducted using a Sidney Bluff-Body Burner, the research evaluates the impact of different bluff-body designs and insulation methods on flow dynamics and thermodynamic properties of flames using various fuels. Results obtained from optical measurements and spectroscopy highlight inconsistencies in the current understanding of the coupling between bluff bodies and recirculation zones, emphasizing the need for further investigation in this area to improve turbulence models.

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Experimental Study of Recirculation Zones on Bluff-Body Stabilized Nonpremixed Flames

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  1. An experimental study of recirculation zones on a bluff-body stabilized nonpremixed flamePrapti MahandariMechanical 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. Schema Bluff-Body Stabilized Nonpremix Flame Fixed Bluff-body 3 Different Bluff-Bodies Insulation: Blanket, ‘Jacketed’ Tube Insulation: Blanket, ‘Jacketed’ Tube, Heat Exchanger Quartz Tubes: Quartz Tube: Fuels: C2H4 only Fuels: H2, C2H2, C2H4, n-C7H16 Injector & 3 Bluff-bodies: Injectors& Bluff-body OPTICAL MEASUREMENT IMAGE AND SPECTROSCOPY OPTICAL MEASUREMENT IMAGE AND SPECTROSCOPY

  4. 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 OBJECTIVES

  5. INDEPENDENT VARIABLES:EXPERIMENTAL ACCURACY

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