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 ...
Experimental study of engine-like turbulent combustion 80 Pressure (bar) 60 40 20 Shot 1 Shot 2 Shot 3 0 90 100 110 120 130 140 150 160 170 180 Time (ms) 80 (c) tel-00623090, version 1 - 13 Sep 2011 Pressure (bar) 60 40 20 0 Shot 1 Shot 2 Shot 3 90 100 110 120 130 140 150 160 170 180 Time (ms) (d) Figure 5.8 b – Pressure signals for various ignition timings. (c) 7.5 ms BTDC. (d) 12.5 ms BTDC. Figure 5.8 shows the good reproducibility of the pressure signal for various ignition timings. The maximum difference between peak pressures is: 1.8 bar for ignition at TDC (70 bar on average, which represents an error of 2.5%); 0.8 bar for ignition timing at 5 ms BTDC (69.2 bar on average representing an error of 1.1%); 0.5 bar for ignition timing at 7.5 ms BTDC (68.8 bar on average, which represents an error of 0.7%);0.5 bar for ignition timing at 12.5 ms BTDC (68.4 bar on average representing an error of 0.7%). 5.1.1.5 Conclusion The quality of the RCM experimental measurements was evaluated on this section throughout a sensibility analysis of errors in measurement techniques and in the 146
Chapter 5 estimation of various parameters on the main experimental results: in-cylinder pressure and volume. This analysis shows the high precision of the Institute Pprime RCM for every measured parameter, which ensures about the quality of the results that will be shown in the following sections. 5.1.2 In-cylinder pressure Figures 5.9-5.10 show RCM experimental pressure histories of stoichiometric syngasair mixtures for various spark times and compression ratio ε =11. Four ignition timings were tested: TDC, 5.0, 7.5 and 12.5 ms before TDC, respectively. 80 tel-00623090, version 1 - 13 Sep 2011 Pressure (bar) 0.0 ms BTDC 5.0 ms BTDC 60 7.5 ms BTDC 12.5 ms BTDC Compression 40 20 0 80 90 100 110 120 130 140 150 160 170 180 190 200 Time (ms) Figure 5.9 – Pressure versus time for stoichiometric updraft syngas-air mixture at various spark times. 80 0.0 ms BTDC Pressure (bar) 60 40 20 5.0 ms BTDC 7.5 ms BTDC 12.5 ms BTDC Compression 0 80 90 100 110 120 130 140 150 160 170 180 190 200 Time (ms) Figure 5.10– Pressure versus time for stoichiometric downdraft syngas-air mixture at various spark times. 147
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Chapter 5<br />
estimation of various parameters on the main experimental results: in-cylin<strong>de</strong>r pressure<br />
and volume. This analysis shows the high precision of the Institute Pprime RCM for<br />
every measured parameter, which ensures about the quality of the results that will be<br />
shown in the following sections.<br />
5.1.2 In-cylin<strong>de</strong>r pressure<br />
Figures 5.9-5.10 show RCM experimental pressure histories of stoichiometric syngasair<br />
mixtures for various spark times and compression ratio ε =11. Four ignition timings<br />
were tested: TDC, 5.0, 7.5 and 12.5 ms before TDC, respectively.<br />
80<br />
tel-00623090, version 1 - 13 Sep 2011<br />
Pressure (bar)<br />
0.0 ms BTDC<br />
5.0 ms BTDC<br />
60<br />
7.5 ms BTDC<br />
12.5 ms BTDC<br />
Compression<br />
40<br />
20<br />
0<br />
80 90 100 110 120 130 140 150 160 170 180 190 200<br />
Time (ms)<br />
Figure 5.9 – Pressure versus time for stoichiometric updraft syngas-air mixture at various spark<br />
times.<br />
80<br />
0.0 ms BTDC<br />
Pressure (bar)<br />
60<br />
40<br />
20<br />
5.0 ms BTDC<br />
7.5 ms BTDC<br />
12.5 ms BTDC<br />
Compression<br />
0<br />
80 90 100 110 120 130 140 150 160 170 180 190 200<br />
Time (ms)<br />
Figure 5.10– Pressure versus time for stoichiometric downdraft syngas-air mixture at various<br />
spark times.<br />
147
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