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

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

“…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.…”

“…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.…”

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

“…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].…”

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

“…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.…”