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MODELING THE INFLUENCE OF FUEL INJECTION AND CHARGE AIR PARAMETERS ON THE EXHAUST EMISSIONS OF A MARINE DIESEL ENGINE
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Tóm tắt
This study investigates the influence of operational parameters, specifically fuel injection characteristics and charge air conditions, on the combustion performance and exhaust gas composition (NOx, CO) of a four-stroke marine diesel engine. A comprehensive physical model, integrating a one-dimensional (1D) flow model for the gas exchange system and a three-dimensional (3D) combustion model within the cylinder, was developed and validated against experimental laboratory data. Simulation results indicate that variations in the fuel spray cone angle, along with charge air pressure and temperature, significantly impact the ignition delay, heat release rate, and emission concentrations. Specifically, an increase in charge air pressure prolongs the combustion process and reduces NOx formation, whereas elevated charge air temperatures increase NOx emissions up to a threshold of 750C. The study confirms that the proposed thermodynamic model is a reliable tool for optimizing the combustion process and controlling emissions in large marine engines, thereby reducing the need for costly empirical testing.
Keywords: Marine diesel engine; Combustion modeling; Exhaust emissions; Fuel injection; Charge air parameters.
Từ khóa
Marine diesel engine, Combustion modeling, Exhaust emissions, Fuel injection, Charge air parameters.
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Tài liệu tham khảo
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