VECOM Low Temperature Combustion
VECOM Low Temperature Combustion
VECOM Low Temperature Combustion
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HCCI Ringing Limit<br />
2) <strong>Low</strong> pass ringing index 1<br />
Based on the assumption that ringing is initiated by and is<br />
proportional to the maximum rate of low freq. pressure rise.<br />
Apply a 5 kHz low pass filter to each cylinder pressure trace<br />
RI LP<br />
<br />
<br />
<br />
1 <br />
2<br />
For typical passenger car engine geometry,<br />
β=0.05<br />
dP<br />
dt<br />
<br />
<br />
<br />
This approach is useful for engine simulations<br />
that do not capture high frequency oscillations.<br />
Keep RI < 5 MW/m 2<br />
<br />
<br />
<br />
W<br />
<br />
m<br />
max<br />
RT<br />
,<br />
2<br />
Pmax<br />
2<br />
-20 -10 0 10 20 30 40<br />
1<br />
Eng J. A., “Characterization of Pressure Wave Oscillation in HCCI <strong>Combustion</strong>,” SAE Paper No. 2002-01-2859, 2002.<br />
<strong>VECOM</strong> Workshop 44 Prague, March 14-15 2012<br />
<br />
<br />
<br />
60<br />
55<br />
50<br />
45<br />
40<br />
35<br />
30<br />
25<br />
P<br />
t<br />
<br />
<br />
<br />
dP<br />
dt<br />
<br />
<br />
<br />
max<br />
P max
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