Etude de la combustion de gaz de synthèse issus d'un processus de ...
Etude de la combustion de gaz de synthèse issus d'un processus de ...
Etude de la combustion de gaz de synthèse issus d'un processus de ...
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Experimental study of engine-like turbulent <strong>combustion</strong><br />
Let us now verify the influence of spark time jitter on the pressure signal. For this<br />
analysis two cases with simi<strong>la</strong>r scatter of spark time (0.84 ms and 0.87 ms,<br />
respectively) are presented for different ignition timings, 5.0 ms BTDC and 12.5 ms<br />
BTDC.<br />
70<br />
12<br />
60<br />
10<br />
Pressure (bar)<br />
50<br />
40<br />
30<br />
20<br />
8<br />
6<br />
4<br />
Voltage (V)<br />
10<br />
2<br />
tel-00623090, version 1 - 13 Sep 2011<br />
0<br />
100 105 110 115 120 125 130 135 140 145 150 155 160<br />
Time (ms)<br />
Figure 5.6 – Pressure and spark signals for updraft syngas: ignition at 5.0 ms BTDC.<br />
Pressure (bar)<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
0<br />
12<br />
10<br />
8<br />
6<br />
4<br />
Voltage (V)<br />
10<br />
2<br />
0<br />
0<br />
100 110 120 130 140 150 160<br />
Time (ms)<br />
Figure 5.7 – Pressure and spark signals for downdraft syngas: ignition at 12.5 ms BTDC.<br />
Analyzing figures 5.6 and 5.7 is observed that the effect of the spark time scatter has<br />
higher influence on in-cylin<strong>de</strong>r pressure when the ignition is ma<strong>de</strong> close to TDC. This<br />
could also justify the fact of lower reproducibility of pressure signal for ignition timings<br />
close to TDC as shown in the next section.<br />
144
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