Erman, Aydek Gökçe;
(2021)
Experimental Investigation in a Compression Ignition Engine of Future Fuels and The Relationship between Exhaust Particle Size and Toxicity.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
As the World population grows, energy demand continues to increase. Fossil fuels continue to be the main source of energy supply. However, a determined transition to a lower-carbon global economy is required in order to reduce the future impact of global warming. The goal of this work was to improve understanding of how molecular structure of future fuels impacts on diesel combustion and exhaust emission. Also, another aim of this work was to explore the potential of using future fuels obtained from biomass which had undergone limited reprocessing. Another related goal was to study the way in which the toxicity of particulate emission from a compression ignition engine varies with particle size. The experiments were carried at a constant engine speed of 1200 rpm for the results in chapters 5, 6 and 7. For the results in chapters 5 and 6, the experiments were done at IMEPs of 4 and 6 bar and in the case of the results in Chapter 7, the experiments were done at IMEPs of 4 and 5.5 bar. The influence of fuel cetane number on combustion and exhaust emission was explored by altering ignition delay in two ways: (a) naturally, using a wide range of fuels, and (b) artificially, using small amounts of ignition improver added to a base fuel. This study showed that ignition delay had the greatest influence on combustion and emissions, while the physical and chemical properties of the fuel were more influential at 6 bar IMEP than 4 bar IMEP. The impact of increasing amounts of molecular-bound oxygen on combustion and emissions was investigated using binary blends of oxygenated/fossil fuels. It was found that the duration of ignition delay was controlled by the reactivity of the individual components and synergies between them. Also, the impact of molecular-bound oxygen on combustion efficiency and exhaust emissions varied with engine operating conditions (e.g. load). Tests were also conducted using a number of lignocellulosic-derived molecules as fuels (including some platform molecules). It was found that combustion and emissions were affected by both the duration of ignition delay and fuel physical and chemical properties. Lastly, the relationship between particulate particle size and particle PAH concentration and toxicity was investigated for a fossil fuel and a biofuel. It was found that fossil diesel had the highest overall particle toxicity level, while the B30 toxicity level was generally greatest at smaller particle size range.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Experimental Investigation in a Compression Ignition Engine of Future Fuels and The Relationship between Exhaust Particle Size and Toxicity |
| Event: | University College London |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10122860 |
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