Premixed Turbulent combustion

1
Premixed Turbulent combustion

• 2004.06.09

2
The contents of tables

• Fronzen state
• Damkohler number
• Residence time
• Mixture fraction variables
• Flammable mixture range
• Regime of turbulent premixed combustion
• Corrugated flame-let regime
• Kinematic balance of steady oblique flame
• Level set approach
• G equation
• Flame stretch effect
• Markstein number
• Level set approach for the corrugated flame-let
  regime
• Flame stabilization

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Frozen state Metastable domain
1300k(hydrocarbon)
1000k(hydrogen)
0.k
4
Damkohler number1.p4592.p4
extinction
Burned
ignition
Unburned
5
Residence time in WSR1.p191
Reactor volume
Mixture density
Total Mass flow rate
An introduction to combustion (concepts
applications 2nd ed.) Stephen R. turns Intl 2000
6
Mixture fraction variables 2.p172
Fuel stream
oxidizer stream
7
Flammable mixture range2.p66
8
Regime of Turbulent Premixed Combustion 2.p79
9
Corrugated flame-let regime
Broken regime
corrugated regime
Thin reaction regime
Wrinkled regime
Inner layer thickness
10
Kinematic balance of Steady oblique flame2.p72
burnt
unburnt
11
Level set approach2,p91
Arbitrary BUT fixed for Particular combustion
event
12
G equation2,p92
Kinematical balance
Well defined burning velocity
13
Burning velocity with flame stretch effect2.p95
Markstein length
Unstretched planar flame
curvature
Strain rate
14
Markstein number
15
Level set approach for the corrugated flame-lets
regime
16
Flame stabilization1,p470

• Low velocity bypass ports
• Refractory burner tiles
• Bluff body Flame-holder(Recirculation)
• Swirl or jet-induced recirculating flows
• Rapid increase in flow area creating
  recirculating separated flow

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The contents of tables II

• The level-set approach for the thin reaction zone
  regime
• Favre average
• Mean variance
• Flame structure
• Turbulence flame brush thickness
• G Flame thickness
• A common level set equation for both regimes

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The levelset approach for the thin reaction zone
regime
skipped
19
Favre Average
20
Mean variance
21
Flame structure2.p27
22
Turbulent flame brush thickness2,p111
23
G flame thickness
24
A common level set equation for both regimes
25
Equation for the mean the variance of G
26
Modeling
27
reference

• An introduction to combustion (concepts
  applications 2nd ed.) Stephen R. turns Intl 2000
• Turbulent combustion Norbert Peters