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Technical Paper

Influence of Oxy-Fuel Combustion on Engine Operating Conditions and Combustion Characteristics in a High Speed Direct Injection (HSDI) Diesel Engine under Homogenous Charge Compression Ignition (HCCI) Mode

2020-04-14
2020-01-1138
Oxyfuel combustion and nitrogen-free combustion coupled with Carbon Capture and Storage (CCS) techniques have been recently proposed as an efficient method to achieve carbon free emissions and to improve the combustion efficiency in diesel engines. In this study, a 3-D computational fluid dynamics model has been used to evaluate the influence of oxyfuel-HCCI combustion on engine operating conditions and combustion characteristics in a HSDI diesel engine. Investigations have conducted using four different diluent strategies based on the volume fraction of pure oxygen and a diluent gas (carbon dioxide). The first series of investigations has performed at a constant fuel injection rating at which 4.4 mg of fuel has injected per cycle. In the second part of analysis, the engine speed was maintained at 1500 rev/min while the engine loads were varied by changing the fuel injection rates in the range of 2.8 to 5.2 mg/cycle.
Technical Paper

Analysis of the Influence of Inlet Temperature on Oxy-Fuel Combustion in an HSDI Diesel Engine

2022-06-14
2022-37-0003
Carbon Capture and Storage (CCS) techniques in combination with oxy-fuel combustion have been applied as an effective way to achieve nitrogen-free combustion and zero-carbon emissions. The present study has been carried out computationally in the framework of a European project (RIVER) (funded by Interreg North-West Europe) to explore the effect of intake charge temperature on oxy-fuel combustion in an HSDI diesel engine under HCCI combustion mode. Experimental data obtained from a Ford Puma common-rail diesel engine for a conventional part-load condition at 1500 rev/min and 6.8 bar IMEP have been used to validate the CFD model. To simulate the combustion process of HCCI, a reduced chemical n-heptane-n-butanol-PAH model has been adopted. The model has 349 elementary reactions and 76 species. The simulation has been carried out at five different intake charge temperatures (140°C, 160°C, 180°C, 200°C, and 220°C) and five different intake oxygen percentages (15%, 17%, 19%, and 21% v/v).
Technical Paper

Simulation Study on Implementation of Oxy-Fuel Combustion for a Practical GDI Engine

2021-04-06
2021-01-0380
As the impacts of global warming have become increasingly severe, Oxy-Fuel Combustion (OFC) has been widely considered as a promising solution to reduce Carbon Dioxide (CO2) for achieving net-zero emissions. In this study, a one-dimensional simulation was carried out to study the implementation of OFC technology on a practical turbocharged 4-cylinder Gasoline Direct Injection (GDI) engine with economical oxygen-fuel ratios and commercial gasoline. When the engine is converted from Conventional Air-fuel Combustion (CAC) mode to OFC mode, and the throttle opening, oxygen mass fraction, stoichiometric air-fuel ratio (lambda = 1) are kept constant, it was demonstrated that compared to CAC mode, θF gets a remarkable extension whereas θC is hardly affected. θF and θC are very sensitive to the ignition timing, and Brake Specific Fuel Consumption (BSFC) would benefit significantly from applying Maximum Brake Torque (MBT) ignition timing.
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