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Numerical Analysis of Combustion in Gasoline Compression Ignition Engines
Technical Paper
2002-01-2865
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A new auto-ignition combustion model for performing multi-zone engine cycle simulations has been developed to investigate the characteristics of compression ignition combustion in gasoline engines. In this combustion model, the auto-ignition timing is predicted with a modified shell model and combustion speed is calculated with a three-region (burned, ignited and unburned) model. Engine cycle simulations performed with this model were used to analyze the effect of engine operating parameters, i.e., temperature and air-fuel distributions in the cylinder, on combustion characteristics. It was found that the air-fuel distribution in the cylinder has a large impact on combustion characteristics and knocking was prevented by creating a fuel-rich zone at the center of the cylinder under high load conditions. The fuel-rich zone works as an ignition source to ignite the surrounding fuel-lean zone. In this way, two-step combustion is accomplished through two separate auto-ignitions. Based on these results, this paper discusses the possibility of obtaining stable auto-ignition combustion in a gasoline engine at high loads without any knocking.
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Citation
Yoshizawa, K., Teraji, A., Aochi, E., Kubo, M. et al., "Numerical Analysis of Combustion in Gasoline Compression Ignition Engines," SAE Technical Paper 2002-01-2865, 2002, https://doi.org/10.4271/2002-01-2865.Also In
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