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Dissertation
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Sciences and engineering --- Physical sciences --- Applied sciences --- Engineering --- Mechanical.
Dissertation
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Book
Year: 2007 Publisher: Warrendale, Pa SAE International
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In order to find effective solutions to the problem of air pollution due to combustion processes, attention is paid to the research projects to find alternative sources of energy to replace the rapidly depleting petroleum resources. This paper discusses the experimental studies carried out in a multi-cylinder four stroke gasoline engine using hydrogen as the sole fuel. Apart from this, a new approach on the storage apparatus has also been attempted. The main problem in the gaseous hydrogen storage has been taken care with a new system which is comprised of a capsule that contains nanomaterials in it. Hydrogen is stored in that capsule and it is directly fitted with the engine. This capsule would replace the current fuel storage cylinders. It occupies less size and it also takes care of the safety issues. The performance and emissions characteristics of the hydrogen-fueled engine at constant speed compared with that of gasoline operation has been presented. Reduction in power output, increased thermal efficiency and only NOx emissions are observed with hydrogen-fueled operation.
Motorcars engineering --- H (waterstof) --- auto's
Book
Year: 2008 Publisher: Warrendale, Pa SAE International
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Hydrogen-fueled internal combustion engines equipped with port fuel injection offer a cheap alternative to fuel cells and can be run in bi-fuel operation side-stepping the chicken and egg problem of availability of hydrogen fueling station versus hydrogen vehicle. Hydrogen engines with external mixture formation have a significantly lower power output than gasoline engines. The main causes are the lower volumetric energy density of the externally formed hydrogen-air mixture and the occurrence of abnormal combustion phenomena (mainly backfire). Two engine test benches were used to investigate different means of compensating for this power loss, while keeping oxides of nitrogen (NOx) emissions limited. A single-cylinder research engine was used to study the effects of supercharging, combined with exhaust gas recirculation (EGR). Supercharging the engine results in an increase in power output. The combination with EGR permits stoichiometric operation and thus low NOx emissions because of the resulting high aftertreatment efficiency. Furthermore, the power output can be varied through the supercharging pressure and the EGR percentage, enabling throttle-less operation and thus higher engine efficiencies. A four-cylinder production gasoline engine was converted to bi-fuel operation and was used to study the effects of continuously variable intake valve timing on power output, efficiency, emissions and the occurrence of backfire when operated on hydrogen. The engine efficiency on hydrogen is compared to gasoline operation.
Motorcars engineering --- brandstofcellen --- H (waterstof) --- auto's --- verbrandingsmotoren
Book
ISBN: 9789065691583 Year: 2015 Publisher: Brussel KVAB Press (Koninklijke Vlaamse Academie van België voor Wetenschappen en Kunsten)
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