Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load

Gong, Changming; Si, Xiankai; Li, Fenghua

doi:10.1016/j.fuel.2021.120442

Cited by 82 publications

(9 citation statements)

References 64 publications

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“…Whereas, the opposite trend is found for the ID and CD with an increase of λ value, owing to ethanol's lower laminar flame speed with less concentration of fuel in the combustion chamber 89 . Also, the air motion plays a vital role in preparing a homogenous air‐fuel mixture in the engine cylinder and air motion is induced by changing the design of combustion systems like the intake manifold and piston bowl geometry 111 . The rate of pressure rise, burning rate, and combustion noise are increased with the increase of tumble ratio (TR) due to enhancing air‐fuel mixture formation.…”

Section: Flex‐fuel Engine Output Characteristics Under Steady‐state C...mentioning

confidence: 99%

“…89 Also, the air motion plays a vital role in preparing a homogenous air-fuel mixture in the engine cylinder and air motion is induced by changing the design of combustion systems like the intake manifold and piston bowl geometry. 111 The rate of pressure rise, burning rate, and combustion noise are increased with the increase of tumble ratio (TR) due to enhancing air-fuel mixture formation. However, the air motion is not effective at lower speed conditions.…”

Section: Operating Parametersmentioning

confidence: 99%

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Critical review on recent progress of ethanol fuelled flex‐fuel engine characteristics

Azhaganathan

Ashok

2022

Intl J of Energy Research

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Summary Ethanol‐powered spark ignition (SI) engines have the potential to mitigate the twin crisis of fossil fuel depletion and exhaust emissions. However, the successful promotion of ethanol is hindered due to the restriction of fuel blend diversity and design features in the conventional SI engine. The fuel flexibility can be overcome by the use of flex‐fuel engine (FFE) technology with appropriate changes in engine design features for a wide range of ethanol blends. The understanding of FFE based on various technical aspects has greater potential in the automotive sector. Therefore, this review paper provides a holistic approach to critically analyze the various technical aspects of FFE. In this work, the application of ethanol blends on FFE output characteristics is reviewed critically considering the effects of engine operating conditions and parameters. Further, the impact of ethanol blends on material compatibility, cold starting characteristics, and unregulated emissions are analyzed. The outcome of the study shows that combustion and performance characteristics such as cylinder pressure(CP), heat release rate (HRR), and brake thermal efficiency (BTE) are improved in FFE operation due to the clean‐burning characteristics of ethanol blends. Also, carbon monoxide(CO) and hydrocarbon (HC) emissions decreased without any significant improvement in nitrogen oxides (NOx) emissions with a wide range of ethanol shares in FFE. Finally, this study summarizes the present status of research in FFE and creates a route towards the direction of multidisciplinary research need in the future that supports the application of different types of biofuels in FFE.

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Section: Flex‐fuel Engine Output Characteristics Under Steady‐state C...mentioning

confidence: 99%

Section: Operating Parametersmentioning

confidence: 99%

Critical review on recent progress of ethanol fuelled flex‐fuel engine characteristics

Azhaganathan

Ashok

2022

Intl J of Energy Research

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“…As a result, it is possible to raise the engine thermal efficiency [19]. Stratified mixtures are formed by fuel injection to the combustion chamber just before ignition on the compression stroke [20]. In this mode of the engine, for stable combustion, it is necessary to make an appropriate mixture around the ignition plug [21].…”

Section: Gdi Engine Modes Of Run and Their Impact On Fuel Consumptionmentioning

confidence: 99%

The Indicator of GDI Engine Operating Mode and Its Influence on Eco-Driving

Pawlak

Wołczyński

2022

Applied Sciences

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Elements of car construction, especially the information available on a dashboard, can stimulate the way of driving. The experiment described in the paper aimed to examine how the information provided by the indicator, which informs about the operational mode of a gasoline direct injection (GDI) engine, can contribute to eco-driving and the possible learning of acceleration pedal operation by a driver. The analysis of the fuel injection process affected by driver behaviour was an essential part of the experiment. The experiment was divided into two parts. The first one (nine tests) consisted of driving without access to the indicator information. In the second part, the information on the mode of the engine run was available for the driver. The results confirmed that the information about the type of fuel mixture used for the supply of the GDI engine facilitates an economical driving style (about 10% fuel savings) and motivates the driver to engage in eco-driving.

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“…Since IT is one of the key roles in optimizing GDI engine performance, many researchers have focused on its effect on engine performance (Huang et al, 2003;Shi et al, 2020). Gong et al (2021) studied IT and CO 2 dilution on combustion and emissions of a stoichiometric GDI engine. The result shows that peak cylinder pressure, peak heat release rate, and peak cylinder temperature first increased, and then decreased as retarding IT.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Injection Timing Effects on a GDI Engine Performance: Part B, In-Cylinder Emission Formation and Oxidation Process

et al. 2022

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The emphasis on environmental protection and energy security has promoted automobile engine technology toward low emission and economy. While the traditional port fuel injection engine can hardly meet the latest regulations and requirements, the gasoline direct injection (GDI) engine becomes a hot research topic because of its potential to reduce fuel consumption and emissions. Since injection timing has a determining effect on overall engine performance, this paper aimed to investigate the injection timing effects on mixture formation and emissions. A validated three-dimensional numerical simulation model of a 4-stroke GDI engine combustion chamber was adopted. In a previous work (Part A), the in-cylinder combustion process has been discussed. In this study, the simulation results demonstrate that with the injection timing advancing, the fuel–gas mixture was more uniformly distributed and combusted more completely; the CO, UHC, and soot had decreased sharply by 80.6, 99.2, and 97.5%; the NOx emission increased by 151.7%. The optimized injection timing for this case was 300 CA BTDC. Moreover, this paper studied the in-cylinder views of injection timing effects on mixture formation and emission, providing reference to optimize injection of GDI engine.

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Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load

Cited by 82 publications

References 64 publications

Critical review on recent progress of ethanol fuelled flex‐fuel engine characteristics

Critical review on recent progress of ethanol fuelled flex‐fuel engine characteristics

The Indicator of GDI Engine Operating Mode and Its Influence on Eco-Driving

Numerical Investigations of Injection Timing Effects on a GDI Engine Performance: Part B, In-Cylinder Emission Formation and Oxidation Process

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