Combustion chamber deposits in spark ignition engines
Conference
·
OSTI ID:370713
- Shell Research Ltd., Chester (United Kingdom)
Combustion chamber deposits (CCD) derived primarily from the fuel but with some contribution from the oil are formed in a spark-ignition engine with use. Deposit growth is a dynamic and reversible process and decreases with an increase in surface temperature. At a fixed temperature, less volatile fuels tend to form more deposits than more volatile fuels. CCD reduce the heat lost to the coolant and increase the charge temperature, thereby increasing flame propagation rates but reducing volumetric efficiency, they might also affect the final phase of combustion chemically. Hence they cause an increase in octane requirement and NO{sub x} and a reduction in maximum power but an improvement in fuel economy. The effect of CCD on HC and CO emissions is not clear. Deposit growth, its response to changes in fuel and engine operating conditions and the effect on engine performance vary across the combustion chamber and between different engines.
- OSTI ID:
- 370713
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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