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Fluent
Combustion Modeling Case Studies
1999 User Group Meeting Short Course
Graham GoldinFluent Inc
.
Three cases studies:
𠕇
IFRF swirling pulverized coal flame
𠕇
GE LM-1600 gas turbine combustor
𠕇
Large Eddy Simulation of LPC instability
Case 1: IFRF swirling pulverized coal flame
𠕇
IFRF industrial scale furnace
𠕇
Built on simulation by Peters and Weber (1997),
Mathematical Modeling of a 2.4 MW Swirling, Pulverized Coal Flame
, Combustion Science and Technology,
122
, 131 [Ref. 1]
exhaust
1/4
geometry
7 cooling loopsmeasurement locations:
z = 0.25m, 0.85m
combustion air:
swirl no. = 0.923, flow rate = 2684kg/h
coal
flow rate = 263 kg/h
, with transport air
flow rate = 421 kg/h
1/4
geometry
Grid
𠕇
3D, one quarter geometry model due to periodicity
𠕇
Unstructured hexahedral mesh
70k cells before adaption
260k cells after region adaption near inlet
Maximum equi-angle skew of 0.53
Turbulence modeling
𠕇
Standard k
ε
turbulence model, standard wall functions
not substantially sensitive to the turbulence model
Mean velocity magnitude (
m/s
)
Gas phase combustion modeling (1)
𠕇
Eddy Dissipation (Magnussen) model [parameters from Ref. 1]
two step reaction
VOL + 2.46O
2
2.17CO + 0.633CO
2
+ 2.118H
2
O + 0.071N
2
CO + 0.5O
2
CO
2
model constants
A = 0.6, B = 10
20
(standard
A = 4, B=0.5
)
Adjusted specific heat’s
(SI units)
Species
c
0
c
1
c
2
c
3
c
4
c
5
c
6
N
2
1.027e32.162e-21.486e-4-4.484e-8
CH
4
2.005e3-6.814e-17.086e-3-4.714e-68.513e-10
CO
1.047e3-1.568e-15.399e-4-3.011e-75.050e-11
H
2
1.415e41.737e-16.900e-4
CO
2
5.354e21.279-5.468e-4-2.382e-71.892e-10
H
2
O
1.938e3-1.1813.644e-3-2.863e-67.596e-10
O
2
8.763e21.228e-15.583e-4-1.202e-61.147e-9-5.124e-138.566e-17
=
iiip
TcTc
)(
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