Author
Ghazi A. Karim
Other affiliations: Imperial College London
Bio: Ghazi A. Karim is an academic researcher from University of Calgary. The author has contributed to research in topics: Combustion & Ignition system. The author has an hindex of 31, co-authored 142 publications receiving 3796 citations. Previous affiliations of Ghazi A. Karim include Imperial College London.
Topics: Combustion, Ignition system, Methane, Spark-ignition engine, Fuel gas
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a review of the positive features and current limitations associated with the use of hydrogen as a spark ignition engine fuel is made. But the question whether hydrogen can be manufactured abundantly and economically will remain the limiting factor to its widespread use as an S.I. engine fuel in the future.
379 citations
TL;DR: In this paper, the effects of the presence of some hydrogen with methane on the main combustion characteristics of the fuel for engine applications were investigated and it was shown experimentally that the performance of a single cylinder spark ignition engine fuelled with methane can be improved significantly through mixing hydrogen with the methane.
285 citations
TL;DR: In this paper, the main effort needed to overcome the problems associated with the operation of gas fueled dual fuel engines is via a better control of the relatively complex processes of combustion, and experimental and analytical modeling procedures for effecting optimum improvement to the combustion process are described.
Abstract: In the dual fuel engine much of the energy release comes from the combustion of the gaseous fuel white only a small amount of diesel liquid fuel provides ignition through timed cylinder injection. Such operation with optimum conversion methods has the potential to provide operational characteristics that are comparable or superior to those of the corresponding diesel or spark ignition engines. There characteristics may be realized only if sufficiently effective measures can be ensured both for the avoidance of knock, usually at high loads, and incomplete gaseous fuel utilization at relatively light loads. An objective of this contribution is to demonstrate that the main effort needed to overcome the problems associated with the operation of gas fueled dual fuel engines is via a better control of the relatively complex processes of combustion. Both experimental and analytical modeling procedures for effecting optimum improvement to the combustion process are described.
273 citations
TL;DR: In this article, a brief review of the characteristics of the dual fuel engine of the compression ignition type and the combustion phenomena that bring about such characteristics is presented, operating with liquefied natural gas and under low intake temperature is also considered.
217 citations
TL;DR: In this paper, it is shown that when the work energy required for the production of hydrogen by electrolysis is taken into account, the range of viable operation of such an engine is very narrow.
167 citations
Cited by
More filters
TL;DR: In this article, a review is given of contemporary research on the hydrogen-fueled internal combustion engine and the emphasis is on light-to medium-duty engine research, where it is shown that due to low volumetric efficiencies and frequent preignition combustion events, the power densities of premixed or port-fuel-injected hydrogen engines are diminished relative to gasoline-powered engines.
831 citations
TL;DR: A comprehensive overview of hydrogen-fueled internal combustion engines (H 2 ICEs) can be found in this paper, where the authors discuss the fundamentals of the combustion of hydrogen, details on the different mixture formation strategies and their emissions characteristics, measures to convert existing vehicles, dedicated hydrogen engine features, a state of the art on increasing power output and efficiency while controlling emissions and modeling.
743 citations
29 Jul 2014
TL;DR: The types of sensors reviewed in this chapter are (1) room-temperature hydrogen leak sensors; (2) thermometers, particularly useful at low temperature; (3) liquid hydrogen volume and mass gauges; and (4) para/ortho hydrogen ratiometers as mentioned in this paper.
Abstract: Four types of hydrogen detectors are used by researchers, engineers, and manufacturers
today, and if hydrogen continues to play a role in emerging alternative energy sources,
there will be exponential growth in the use and need for more advanced and more robust
devices in the future. The types of sensors reviewed in this chapter are (1) room-temperature hydrogen leak sensors; (2) thermometers, particularly useful at low temperature;
(3) liquid hydrogen volume and mass gauges; and (4) para/ortho hydrogen ratiometers.
631 citations
TL;DR: In this article, a dual-fuel engine with high-cetane fuel and natural gas injection is used to provide a source of ignition for the charge of a spark-ignition (SI) engine.
595 citations
TL;DR: In this article, the up-and-coming hydrogen energy economy, its environmental and climatic relevance, its exergizing influence on the energy system, its effect on decarbonizing fossil fueled power plants, the introduction of the novel non-heat-engine-related electrochemical energy converter fuel cell in portable electronics, in stationary and mobile applications.
562 citations