Effect of adding oxygen to the intake air on a dual-fuel engine performance, emissions, and knock tendency

Abdelaal, Mohsen; Rabee, Basem A.; Hegab, Abdelrahman

doi:10.1016/j.energy.2013.09.022

Cited by 92 publications

(27 citation statements)

References 21 publications

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“…The basic philosophy of the model was not modified for the needs of the present study, but care was exerted for inclusion of various oxygen contents of the aspirated air. The data of the only relatively complete experimental investigation in [44] were used here, solely to calibrate and moreover evaluate the predictive capabilities of the model. It concerns a single cylinder, 4-stroke, water cooled, naturally aspirated, direct injection (DI) diesel engine, having a bowl-in-piston combustion chamber, converted to operate in natural gas-diesel dual fuel (NG/DDF) mode.…”

Section: Validation Of the Modelmentioning

confidence: 99%

“…In contrast to the above, the investigation/evaluation of the effects of intake air oxygen enrichment in NG/DDF engines on their combustion, performance, and emissions is limited to less than a handful of experimental investigations (even covering few aspects) [44,45], while no such computational study exists in the international literature. The air-inlet oxygen enrichment seems to be one of the attractive combustion technologies to control pollution and improve combustion quality in a compression ignition environment.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Air Oxygen Enrichment Effects on Combustion and Emissions of Natural Gas/Diesel Dual-Fuel Engines at Various Loads and Pilot Fuel Quantities

Papagiannakis

Rakopoulos

2018

Energies

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The use of natural gas (NG) as supplement of the normal diesel fuel in compression ignition (CI) environments (Natural Gas/Diesel Dual-Fuel, NG/DDF), seems to present an answer towards reducing soot or particulate matter (PM) and nitrogen oxides (NOx) emissions in existing and future diesel engine vehicles. The benefits for the environment can be even higher, as recently NG quality gas can be produced from biomass (bio-methane or bio-CNG or ‘green gas’). However, this engine type where the main fuel is the gaseous one and the diesel liquid fuel constitutes the ignition source (pilot), experiences higher specific energy consumption (SEC), carbon monoxide (CO), and unburned hydrocarbons (HC) emissions compared to the conventional (normal) diesel one, with these adverse effects becoming more apparent under partial load operation conditions. Apart from using bio-fuels as pilot fuel, it is anticipated that air oxygen enrichment—addition of oxygen in the intake air—can mitigate (at least partly) the associated negative results, by accelerating the burning rate and reducing the ignition delay. Therefore, the present work strives to investigate the effects of various degrees of oxygen enrichment on the combustion, performance, and emissions of such a NG/DDF engine, operated under various loads and pilot (diesel fuel) quantities. The study is carried out by using an in-house, comprehensive, computational model, which is a two-zone (phenomenological) one. The accuracy of the modeling results are tested by using related experimental data from the literature, acquired in an experimental investigation conducted on a naturally aspirated, light-duty, NG/DDF engine. The computational study is extended to include various pilot fuel quantities, attempting to identify the influence of the examined parameters and witness advantages and disadvantages. The study results demonstrate that the air oxygen enrichment reduces the specific energy consumption and CO emissions, by accelerating the burning rate and reducing the ignition delay (as revealed by the cylinder pressure and rate of heat release diagrams), without impairing seriously the soot and NO emissions. The conclusions of the specific investigation are much useful, particularly if wished to identify the optimum combination of the parameters under examination for improving the overall performance of existing CI engines functioning under natural gas/diesel fuel operating mode.

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Section: Validation Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the Air Oxygen Enrichment Effects on Combustion and Emissions of Natural Gas/Diesel Dual-Fuel Engines at Various Loads and Pilot Fuel Quantities

Papagiannakis

Rakopoulos

2018

Energies

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“…Knocking combustion could be detected in several ways such as incylinder pressure based detection, cylinder block vibration measurement, acoustic wave measurement analysis, heat transfer based analysis, etc. Both RPR (rate of pressure rise) and heat release rate together can be used for an analysis of the knock tendency in a CI engine [2]. Torregrosa et al supported the fact that the knocking combustion in a CI engine is directly proportional to its maximum rate of pressure rise [3].…”

Section: Introductionmentioning

confidence: 97%

Experimental investigations on effect of different compression ratios on enhancement of maximum hydrogen energy share in a compression ignition engine under dual-fuel mode

Chintala

Subramanian

2015

Energy

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“…Based on the viewpoints of Nwafor [18], more time would be provided for the heat transfer to the end gas if the combustion rate of nature gas was slower and thus the possibility of knocking would be increased in nature gas-diesel dual-fuel engines. By means of adding oxygen to the intake air, Abdelaal et al [19] revealed the effect of the intake air oxygen concentration on the knock tendency in a dual-fuel engine fueled with nature gas and diesel. The result showed that the ignition delay was dramatically reduced, the burning duration was shortened and the tendency of knocking was decreased by adding oxygen to the intake air.…”

Section: Introductionmentioning

confidence: 99%

Effects of rapid burning characteristics on the vibration of a common-rail diesel engine fueled with diesel–methanol dual-fuel

Zhang

et al. 2016

Fuel

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Effect of adding oxygen to the intake air on a dual-fuel engine performance, emissions, and knock tendency

Cited by 92 publications

References 21 publications

Evaluation of the Air Oxygen Enrichment Effects on Combustion and Emissions of Natural Gas/Diesel Dual-Fuel Engines at Various Loads and Pilot Fuel Quantities

Evaluation of the Air Oxygen Enrichment Effects on Combustion and Emissions of Natural Gas/Diesel Dual-Fuel Engines at Various Loads and Pilot Fuel Quantities

Experimental investigations on effect of different compression ratios on enhancement of maximum hydrogen energy share in a compression ignition engine under dual-fuel mode

Effects of rapid burning characteristics on the vibration of a common-rail diesel engine fueled with diesel–methanol dual-fuel

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