Etude de la combustion de gaz de synthèse issus d'un processus de ...

Chapter 4
7
500
Pressure (bar)
6
5
4
3
2
1
Experimental P
Numerical P
Qw
400
300
200
100
Qw (kW/m 2 )
0
0 10 20 30 40 50 60 70 80 90 100
Time (ms)
0
Figure 4.42 – Pressure and heat flux for updraft syngas-air at φ=1.2, P=1.0 bar, T= 293 K.
tel-00623090, version 1 - 13 Sep 2011
From figures 4.40-4.42 one can conclude that pressure evolution of updraft syngas-air
mixtures is accurately reproduced by the code for each equivalence ratio. However,
pressure peak is always higher than the experimental measurement as well as in the
cooling phase. It was found important chamber leakages at this stage, and so the
chamber was repaired. The following results were obtained after the reparation.
Figures 4.43 - 4.45 shows experimental and numerical pressure and the heat flux for
downdraft syngas-air mixture at φ=0.8, φ=1.0 and φ=1.2, respectively.
Pressure (bar)
7
6
5
4
3
2
1
500
Experimental P
Numerical P
400
Qw
300
200
100
Qw (kW/m 2 )
0
0 10 20 30 40 50 60 70 80 90 100
Time (ms)
0
Figure 4.43 – Pressure and heat flux for downdraft syngas-air at φ=0.8, P=1.0 bar, T= 293 K.
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