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    Application of oxygen enrichment and adiabatic humidification to suction air for reducing exhaust emissions in a gasoline engine
    (Taylor & Francis Inc, 2023) Kapusuz, Murat; Cakmak, Abdulvahap; Ozcan, Hakan
    This paper aims to reduce the exhaust emissions of a gasoline engine by conditioning the engine intake air. The oxygen enrichment of inlet air to reduce the HC and CO emissions and humidifying the inlet air to control NOX emissions was applied. The intake air oxygen concentration was increased from 21% to 25% by 2% interval. The oxygen enrichment of the engine inlet air increased the combustion rate, and thus combustion improved, and thermal efficiency increased. This situation led to a reduction in HC emissions and CO emissions. However, the combustion improvement caused a striking rise in NOX emissions because of the high cylinder temperature and high oxygen concentration. This undesirable effect was tried to be alleviated by adiabatic humidification of the engine inlet air. For this purpose, the relative humidity of the intake air was increased from 35% to 65% before and then to 85%. For this, the intake air passed through the conditioning chamber, the dry thermometer temperature lowered by 4 degrees C for a relative humidity of 85% thanks to the evaporative cooling of water. The results showed that oxygen enrichment caused a 13.5% and 9.3% increase in thermal efficiency in order of half and full load. The humidification method resulted in a 14.3% and 18.3% decrease in thermal efficiency for half and full load. The results also showed that the humidification method could only control NOX increment generated at half load and 23% oxygen condition.
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    Öğe
    The effects of photocatalytic activity with titanium dioxide on the performance and emission characteristics of SI engine
    (Pergamon-Elsevier Science Ltd, 2021) Kapusuz, Murat; Gurbuz, Mevlut; Ozcan, Hakan
    This study aimed to improve the properties of gasoline fuel with the help of the photocatalysis method. Accordingly, a 100 ml volume photocapsule was designed and manufactured. UV radiation was applied on gasoline in the photocapsule. If no reductor is used, no change can be obtained. When water was mixed with the fuel, the changes were below the experimental error. However, in the case of ethanol mixing there have been significant improvements in terms of combustion. Distillation test and FTIR analysis were applied to the fuel samples. As a result of FTIR analysis, it was determined that the alcohol content increased and the fuel storage life was extended. The experiments were carried out for constant throttle opening as 4 speed in the range of 1200-1800 rpm (200 rpm increments) for performance and emissions of the engine. As a result of photocatalysis; unification, conversion to alkane, ether, and alcohol groups were determined. Photocatalysis reduces the emissions of HC and CO by a ratio of 6.68% and 20.5% on average and increases the emissions of CO2 emissions and NOx by a ratio of 19.9% and 34.8% respectively. On the other hand, this method reduces BSFC by a ratio of 9% and increases BTE by a ratio of 10% on average. This research proves that photocatalysis can be used with an improving effect on hydrocarbon mixtures.