Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Diesel combustion"”.
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A Five-Zone Model for Direct Injection Diesel Combustion
… of the internal structure of direct injection diesel fuel jets as well as empirical correlations predicting jet development and structure. This information was used to create a diesel cycle simulation model using C language including compression, fuel injection and combustion, and expansion …
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Ionization in diesel combustion: Mechanism, new instrumentation and engine applications
<p>Diesel engines are known for their superior fuel economy and high power density. However they emit undesirable high levels of nitrogen oxide (NOx) and black particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an …
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Effects of oxygenated fuels on DI diesel combustion and emissions
… Mechanisms responsible for changes in the combustion process and emissions were investigated with a matrix containing 14 fuels, addressing oxygenate proportionality, structure, volatility, equivalent structure without oxygen, and changes in the base diesel fuel. A scanning mobility particle …
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Ionization In Diesel Combustion For On-Board Diagnostics And Engine Control
<p>Diesel engines have been known for their high thermal efficiency and specific power output, but there is concern about engine-out NOx and particulate matter emissions. To meet the current emission standards, advanced diesel engines are fitted with electronically controlled fuel injection systems …
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Design, set up and commissioning of a test facility for smokeless rich diesel combustion research
Low Temperature Combustion (LTC) is a strategy that harnesses the properties of exhaust gas, through the use of large quantities of exhaust gas recirculation (EGR), to reduce the peak combustion temperatures below that favoured by the formation processes of oxides of nitrogen (Ox) and those of …
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Issues on Clean Diesel Combustion Technology Using Supercritical Fluids: Thermophysical Properties and Thermal Stability of Diesel Fuel
<p>The clean diesel combustion technology using supercritical fluids is aimed to both improve fuel economy and reduce harmful emissions. This novel process involves preparation, injection and combustion of supercritical fuel/diluents mixtures. Design and development of this new process require a …
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Study of Ultra-low Emissions Diesel Combustion Systems by Synergetic Application of 3D-CFD and Single-Cylinder Engine
L'abstract è presente nell'allegato / the abstract is in the attachment
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Air/fuel mixing enhancement and emission reduction through intake port design and various fuel emulsions for diesel combustion
… constraints require the next generation internal combustion engine (ICE) to yield lower pollutant emissions and higher fuel efficiency. The air/fuel mixture inside the ICE, which has a pivotal impact on the subsequent combustion and emission performance, is a key aspect to achieve those …
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Investigation of Clean Diesel Combustion With Oxygenated Fuels in a Constant -Volume Combustion Chamber Using Forward Illumination Light Extinction Technique
… soot reduction performances at different diesel combustion modes. In the premixed combustion mode, the higher oxygen efficiency from TPME due to its molecular structure advantage contributes to the less soot generation. While at mixing controlled combustion mode, DBM oxygenated fuel has …
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Combustion quality and regimes for standard and alternative fuels
… constraints require the next generation internal combustion engine (ICE) to yield lower pollutant emissions and higher fuel efficiency. Various alternative fuels and combustion strategies and regimes have shown great potential in meeting these goals. The work done in this dissertation aims at …
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Performance effects and causal mechanisms of mid-channel congestion in diesel particulate filters
The diesel particulate filter (DPF) is a ~$5,000-$50,000 USD critical component of aftertreatment systems installed in diesel engine-powered vehicles. The device is designed to trap particles emitted by the diesel combustion process in order to prevent their release into the surrounding …
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Characterization and Control of Multi-Cylinder Partially Premixed Combustion
In the last decade diesel combustion has developed in a new direction. Research has been carried out trying to prolong the ignition delay and enhance fuel/air premixing to avoid diffusion combustion as well as lowering the combustion temperature through use of EGR. One of these new combustion …
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The Origin of Polycyclic Aromatic Hydrocarbons in Diesel Exhaust Emissions
Emission limits for diesel engine exhaust pollutants are being continually reduced in line with increasingly stringent emissions legislation. Essential to the task of reducing diesel exhaust emissions is an understanding of the origin of the exhaust pollutants. This research has investigated the …
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The effect of complexes on combustion
… to attempt to investigate these goals. For diesel engine vehicles, this can be achieved by improving the efficiency of the fuel combustion in the combustion chamber. By having a suitable oxidation catalyst in the fuel one would expect the efficiency of the fuel combustion to be increased and …
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Coupling of Chemical Kinetics with Computational Fluid Dynamics in a Three-Dimensional Engine Model
… simplified global reaction steps to simulate the combustion and pollutant formation inside the internal combustion engine. With the current interest in advanced combustion modes and injection strategies, this approach depends on arbitrary adjustment of model parameters that could reduce …
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Design, setup of an optically accessible internal combustion engine for study of gasoline direct injection combustion
… engine was built to visualize GDI combustion. The optical engine was originally designed and used as a compression ignition engine for study of diesel combustion, but was extensively modified for GDI. The cylinder head was modified to include a spark plug, and a new ignition system …
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Experimental and computational study of soot formation under diesel engine conditions
Past research has shown that during diesel combustion, soot is formed in local premixed fuel-rich regions. This project focuses on the fundamentals soot formation under fuel-rich conditions similar to those in diesel engine operation. Since these conditions cannot be easily reproduced in typical …
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The effect of fuel injection pressure and in cylinder temperature on igniton delay, combustion performance and emission
… ignition process plays as a key element in the diesel combustion. The objective of this research was to help an understand of the effects of air fuel mixing process during the ignition delay period and initial heat release in combustion process that strongly affects the exhaust emissions. This …
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The Fate of Naphthalene and n-Alkylnaphthalenes During Combustion, and an Evaluation of the Sources of these Compounds in Diesel Exhaust Emissions
… of naphthalene and n-alkylnaphthalenes during diesel combustion, and an evaluation of their sources in diesel exhaust emissions. This was achieved by the use of a procedure which employed a [14C]radiolabelled PAH technique and a diesel enriched fuel technique (DEFT). The combustion of diesel …
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Development Of A Two-Color Optical Diagnostic For The Determination Of Engine In-Cylinder Soot Temperature And Volume Fraction Evolution With A Flame-Calibrated Emissivity Model
… understanding of advanced compression ignition combustion is requisite to meet the simultaneous challenges of stringent fuel efficiency and emission standards. Single zone simulation shows that nitrogen oxide (NOx) production occurs in a high temperature region and soot production in a high …
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