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Title: A study on the effects of combined diesel-hydrogen combustion on diesel engines using experimental and simulation techniques
Author: Al-Asadi, Ward
ISNI:       0000 0004 7660 7255
Awarding Body: Brunel University London
Current Institution: Brunel University
Date of Award: 2018
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With the increasingly stringent regulations and laws being put in place worldwide with regards to a cleaner and a safer environment, the modern diesel engine has scope to be improved upon to help meet these new standards set for the betterment of our cities. There are many current modes of alternative transport, with diesel-hydrogen combustion being a transitional solution from fossil fuels to hydrogen powered vehicles. The main objective of this research effort was to investigate the effects of intake air enrichment with hydrogen on the performance, combustion, and emissions of a diesel engine. The secondary aim was to design and optimise accurate engine models which can replicate real world experiments and conditions. This becomes increasingly useful in the modern era of engine testing and development as it allows for more manufacturers to test and optimise new combustion methods, without the need for a physical engine, to meet the ever-tightening emissions legislations. Therefore, the accuracy of the models produced could pave the way for more simulations to be carried out via manufacturers with more confidence. The experimental tests were carried out on a 2.0 litre Ford High Speed Direct Injection (HSDI) diesel engine. the engine was tested at various conditions mimicking light- and medium-duty diesel engines. Hydrogen was used via a bottle with the composition of the gas replicating exhaust gas reformed intake air. The percentage of the hydrogen and the start of injection for diesel were altered for the tests. The simulations were carried out on a replicated four-cylinder 2.0 litre Ford HSDI diesel engine on Ricardo Wave® and a single-cylinder DI diesel engine modelled based on a small Yanmar L70N diesel engine. The experimental operating parameters were used in the simulations to measure the level of accuracy achieved with the models on the software. The experimental results showed that with hydrogen enrichment of the intake air, the CO and smoke emissions were reduced significantly, however NOx emissions were found to have increased at certain conditions. The simulations for the multi-cylinder diesel engine showed great promise with an average of 95% accuracy across the operating conditions and emissions measured. The single-cylinder diesel engine displayed low levels of Total Hydrocarbons (THC), Carbon Monoxide (CO), with a slight increase in Oxides of Nitrogen (NOx) emissions but did show high levels of accuracy against literature and other experimental work based on similar operating conditions. Although there is an abundance of literature currently investigating the effects of hydrogen enrichment of the intake air, the new contributions to knowledge of this research is the comparison between simulated and experimental work of transitional combustion methods such as this. This research is believed to help aid the industry in testing and optimising of simulated engine models for a more reliable manufacturing process.
Supervisor: Megaritis, A. ; Ganippa, L. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Ricardo ; Ford ; Emissions