Numerical Investigation of the Impact of Fuel Injection Strategies on Combustion and Performance of a Gasoline Compression Ignition Engine

2009 ◽

Author(s):

Gong Chen

Keyword(s):

Fuel Injection ◽

Cetane Number ◽

Fuel Properties ◽

Liquid Fuels ◽

Compression Ignition ◽

Heavy Duty ◽

Compression Ignition Engine ◽

End Effects ◽

Compression Ignition Engines ◽

The Impact

It is always desirable for a heavy-duty compression-ignition engine, such as a diesel engine, to possess a capability of using alternate liquid fuels without significant hardware modification to the engine baseline. Because fuel properties vary between various types of liquid fuels, it is important to understand the impact and effects of the fuel properties on engine operating and output parameters. This paper intends and attempts to achieve that understanding and to predict the qualitative effects by studying analytically and qualitatively how a heavy-duty compression-ignition engine would respond to the variation of fuel properties. The fuel properties considered in this paper mainly include the fuel density, compressibility, heating value, viscosity, cetane number, and distillation temperature range. The qualitative direct and end effects of the fuel properties on engine bulk fuel injection, in-cylinder combustion, and outputs are analyzed and predicted. Understanding these effects can be useful in analyzing and designing a compression-ignition engine for using alternate liquid fuels.

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Investigation of Fuel Injection Strategies for Direct Injection of Neat n-Butanol in a Compression Ignition Engine

SAE International Journal of Engines ◽

10.4271/2016-01-0724 ◽

2016 ◽

Vol 9 (3) ◽

pp. 1512-1525 ◽

Cited By ~ 6

Author(s):

Tadanori Yanai ◽

Christopher Aversa ◽

Shouvik Dev ◽

Graham Reader ◽

Ming Zheng

Keyword(s):

Fuel Injection ◽

Direct Injection ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Injection Strategies

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Numerical assessment of ozone addition potential in direct injection compression ignition engines

International Journal of Engine Research ◽

10.1177/1468087420973553 ◽

2020 ◽

pp. 146808742097355

Author(s):

Vincent Giuffrida ◽

Michele Bardi ◽

Mickael Matrat ◽

Anthony Robert ◽

Guillaume Pilla

Keyword(s):

Cfd Simulation ◽

Fuel Injection ◽

Direct Injection ◽

High Reactivity ◽

Experimental Results ◽

Injection Timing ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Compression Stroke ◽

The Impact

This paper aims at taking into account the chemistry of O3 in a 3D CFD simulation of compression ignition engine with Diesel type combustion for low load operating points. The methodology developed in this work includes 0D homogeneous reactors simulations, 3D RANS simulations and validation regarding experimental results. The 0D simulations were needed to take into account O3 reactions during the compression stroke because of the high reactivity of O3 with NO and dissociation at high temperature. The values found in these simulations were used as an input in the 3D model to match the correct O3 concentration at fuel injection timing. The 3D simulations were performed using CONVERGETM with a RANS approach. Simulations reproduce the compression/expansion stroke after the intake valve closure to focus on the impact of O3 on the fuel auto ignition. The comparison between numerical and experimental results demonstrates that the proposed methodology is able to capture correctly the impact of O3 addition on ignition delay and on heat release. Moreover, the analysis of the data enables to better understand the fundamental processes driving O3 impact in a CI engine. In particular, using 0D simulations, the plateau effect observed experimentally when increasing O3 concentration is attributed to O3 thermal decomposition and reaction with NO during the compression stroke. Also, 3D CFD results showed that O3 impact is observed mainly during LTHR phase and does not affect the topology and the propagation of the flame inside the combustion chamber.

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Numerical Investigation of the Impact of Spray – Bowl Interaction on Thermal Efficiency of a Gasoline Compression Ignition Engine

10.1115/icef2021-67851 ◽

2021 ◽

Author(s):

Srinivasa Krishna Addepalli ◽

Michael Pamminger ◽

Riccardo Scarcelli ◽

Thomas Wallner

Keyword(s):

Thermal Efficiency ◽

Fuel Injection ◽

Kinetic Mechanism ◽

Chemical Kinetic ◽

Design Parameters ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Baseline Design ◽

Piston Bowl ◽

The Impact

Abstract Gasoline compression ignition (GCI) is a promising way to achieve high thermal efficiency and low emissions while leveraging conventional diesel engine hardware. GCI is a partially premixed combustion concept, which derives its superiority from good volatility and long ignition delay of gasoline-like fuels. The present study investigates the interaction between the piston bowl and the spray plume of a compression ignition engine that operates with a late fuel injection strategy using computational fluid dynamics (CFD) analysis. Simulations were carried out on a single cylinder of a multi-cylinder heavy-duty compression ignition engine. The engine operates at a speed of 1038 rev/min., and a compression ratio of 17. Incylinder turbulence was modelled using RNG k-ε model and the fuel spray break up was modelled using KH-RT model. A reduced chemical kinetic mechanism was used to model combustion chemistry. After validating the combustion and performance characteristics of the baseline piston against experimental results, several new piston bowl designs were generated using CAESES. Full cycle engine simulations for four selected bowl profiles were carried out. The results compare the spray-bowl interaction of the new piston bowl designs with the baseline design. It was found that the lip location and center depth of the bowl profile are the critical design parameters that influence the air utilization and heat transfer losses. The impact of spray-bowl interaction on thermal efficiency of the engine is investigated.

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