AME 513 Principles of Combustion Lecture 8 ... - Paul D. Ronney

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Burning velocity measurement" Many techniques, all attempt to determine the speed of theunburned gases relative to the flame front or vice versa(since that’s the definition of S L ) Counterflow very popular (e.g. Prof. Egolfopoulos)AME 513 - Fall 2012 - Lecture 8 - Premixed flames I19Deflagrations – burning velocities"≈ 2200KS L≈ 40 cm/sorT adT ad SL≈ 1500KFuel %≈ 5 cm/s! ≈ 0.5 ! = 1 ! ≈ 2Lean StoichiometricRichlimitlimitSchematic of flame temperatures andlaminar burning velocitiesReal data on S L (CH 4 -air, 1 atm)AME 513 - Fall 2012 - Lecture 8 - Premixed flames I20• 10
Deflagrations - summary" These relations show the effect of T ad (depends on fuel &stoichiometry), α (depends on diluent gas (usually N 2 ) & P),ω (depends on fuel, T, P) and pressure (engine condition)on laminar burning rates Re-emphasize: these estimates are based on an overallreaction rate; real flames have 1000s of individualreactions between 100s of species - but we can workbackwards from experiments or detailed calculations to getthese estimates for the overall reaction rate parametersAME 513 - Fall 2012 - Lecture 8 - Premixed flames I21• 11
Page 1 and 2: AME 513Principles of Combustion"Lec
Page 3 and 4: Hugoniot curves" Defines possible e
Page 5: Detonation velocities - calculation
Page 8 and 9: Deflagrations - burning velocity" M

AME 513 Principles of Combustion Lecture 8 ... - Paul D. Ronney

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