Modeling of air-fuel mixture flow in a marine four-stroke diesel engine to optimize performance and minimize pollutant emissions
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Date
2024-10-16
Authors
Γαβαλάς, Αντώνιος
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Abstract
Marine four-stroke diesel engines are essential for the propulsion of a wide range of vessels, from commercial to pleasure crafts. Optimizing their performance and minimizing emissions is critical to ensure efficient operation, reduce fuel consumption and limit environmental impact. This study investigates the intricate relationship between engine parameters and emissions performance in marine applications, which contributes significantly to both marine engineering and environmental sustainability. The primary objective was to simulate and improve the air-fuel mixture flow and combustion process in a Perkins 404D-22 four-stroke diesel engine, with a focus on enhancing overall performance and reducing harmful emissions, a critical issue in the maritime industry.
Two types of simulations were carried out: base-speed and parametric. Two discrete operating speeds of the engine, 2200 RPM and 3000 RPM, were simulated to assess the effects of different engine speeds on output of power, combustion efficiency, and emissions formation. After that, several parametric simulations were performed to investigate how engine performance and emissions formation were affected by the initial air temperature, pressure, and injected fuel mass.
The results showed that engine parameters, such as speed and pre-combustion conditions, interact in a complex way, significantly affecting both engine performance and emissions. In general, higher engine speeds produce more power, but they can also result in more pollution and less fuel efficiency. The optimum speed depends on the application. The interaction between the initial air temperature, pressure and mass quantity of injected fuel significantly affects engine performance and emissions. While higher values can improve certain aspects, they also introduce potential trade-offs.
This research aims to improve the operation of marine diesel engines and reduce emissions in order to meet the stringent environmental regulations set by the International Maritime Organization (IMO). The results of the study can be used to develop strategies to improve engine design and operation, thus contributing to the protection of the marine environment and the achievement of sustainable shipping development goals.
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Keywords
Marine diesel engine, Performance optimization, Emissions reduction, Air-fuel mixture flow, Simulation modeling