PremixedFlamesILect16ME525SP2011

PremixedFlamesILect16ME525SP2011 - ME 525: Combustion...

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ME 525: Combustion Lecture 16: Laminar Premixed Flame Structure, Spalding Analysis rof Robert P Lucht Prof. Robert P. Lucht Room 87, Mechanical Engineering Building chool of Mechanical Engineering School of Mechanical Engineering Purdue University West Lafayette, Indiana Email: [email protected] Phone: 765-494-5623 arch 3 2011 School of Mechanical Engineering, Purdue University March 3, 2011 1/30
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Lecture Topics • Premixed combustion in a constant area tube. • Qualitative structure of laminar premixed flames. palding analysis of laminar premixed flames • Spalding analysis of laminar premixed flames. School of Mechanical Engineering, Purdue University 2/30
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Premixed Combustion in a Constant-Area Tube remixed fuel/oxidizer in long constant rea tube Premixed fuel/oxidizer in long, constant-area tube. Fuel/Oxidizer pen both ends, ignite at one end - ombustion wave Open both ends, ignite at one end combustion wave propagates down the tube at velocity of 0.2-2 m/sec - subsonic combustion wave is termed deflagration or flame. Propagation of flame controlled by diffusion of radicals and conduction of heat. Products Unburned Fuel/Oxidizer M<<1 School of Mechanical Engineering, Purdue University 3/30
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Premixed Combustion in a Constant-Area Tube remixed fuel/oxidizer in long, constant- rea tube. Premixed fuel/oxidizer in long, constant area tube. Fuel/Oxidizer pen one end ignite at closed end ombustion wave Open one end, ignite at closed end - combustion wave proceeds at supersonic velocities – detonation . Shock wave structure raises temperature and pressure and causes rapid reaction Products Unburned Fuel/Oxidizer M>1 School of Mechanical Engineering, Purdue University 4/30
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Structure of Premixed Hydrocarbon Flames onsider a premixed uniform flow of premixed HC/air in a Consider a premixed uniform flow of premixed HC/air in a slightly diverging tube: Final Flame Position , v xu L S , v L S , v L S School of Mechanical Engineering, Purdue University 5/30
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Structure of Premixed Hydrocarbon Flames If ignited at either end, the flame will propagate to a position where the laminar flame speed S L matches the velocity of the incoming reactant mixture. School of Mechanical Engineering, Purdue University 6/30
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Structure of Premixed Hydrocarbon Flames Preheat Zone Reaction Zone Recombination Zone T Reactants q Fuel Intermediates HO T H 2 O 2 Structure of a 1-D laminar premixed 2 School of Mechanical Engineering, Purdue University HC flame 7/30
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Structure of Premixed Hydrocarbon Flames lame consists of three zones: Preheat zone Reaction Flame consists of three zones: Preheat zone, Reaction zone, Recombination zone Reaction zone can be further divided into a pyrolysis zone where hydrocarbon fragments are formed, and a zone in which intermediates like CO and H are 2 consumed.
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This note was uploaded on 12/27/2011 for the course ME 525 taught by Professor Lucth during the Fall '11 term at Purdue.

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PremixedFlamesILect16ME525SP2011 - ME 525: Combustion...

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