Performance and emission prediction of hydrogen addition to natural gas powered engine using 0/1 dimensional thermodynamic simulation

Authors : Fatih AKTAŞ

Pages : 67-81

View : 20 | Download : 11

Publication Date : 2022-06-27

Article Type : Research Paper

Abstract :With the increase in global warming, the measures taken by the governments regarding the use of internal combustion engines are also increasing. These measures, on the other hand, encourage the use of alternative fuels, both to reduce emissions and to research less use of petroleum-based fuels such as diesel and gasoline. Natural gas is one of the fuels that has been researched and used as an alternative fuel recently. However, the lower lean limit, high coefficient of variation insert ignore into journalissuearticles values(COV); of indicated mean effective pressure insert ignore into journalissuearticles values(IMEP);, relatively lower diffusivity, requirement of high ignition energy and high flme quenching distance properties of natural gas compared to gasoline fuel have a limiting effect. However, these properties can be improved with the addition of a certain amount of hydrogen. In this study, a 3-cylinder diesel tractor engine was converted into a spark-ignition engine using natural gas. Then, by adding hydrogen at low rates between 1% and 5% by mass, its effects on performance, combustion characteristics, and emission values were examined. Despite the high compression ratio of the diesel engine, such as 17.5:1, it was observed that the addition of 5% hydrogen did not cause knocking. In addition, brake power insert ignore into journalissuearticles values(BP);, brake specific fuel consumption insert ignore into journalissuearticles values(BSFC);, brake thermal efficiency insert ignore into journalissuearticles values(BTE);, and brake mean effective pressure insert ignore into journalissuearticles values(BMEP); values improved with increasing hydrogen addition as 11.33%, 7.5%, and 0.49% respectively. In addition, in-cylinder temperature and pressure values increased due to increasing lower heating values and flame speed. While total hydrocarbon insert ignore into journalissuearticles values(THC); emission values decreased, nitrogen oxide insert ignore into journalissuearticles values(NOX); and carbon monoxide insert ignore into journalissuearticles values(CO); emission values increased slightly.
Keywords : Natural gas, Hydrogen addition, Internal combustion engine, Performance, Emission