experimental investigation of injection timing effect on rcci engine using waste oil biodiesel as high reactive fuel

Three major threats that endanger human life and the planet are the escalating pollution levels, the intensifying global warming, and the rapid depletion of fossil fuel resources. these challenges have prompted researchers to explore the use of alternative fuels that are widely available, renewable, and have lower pollution emissions. biodiesel obtained from waste oil has almost all these characteristics. considering the objectives of the sustainable development goals in increasing the use of biodiesel in the future, it is essential to investigate the performance of this fuel in next-generation internal combustion engines such as reactivity-controlled compression ignition (rcci) engines. the start of injection (soi) parameter in rcci engines is important to find suitable performance intervals and optimize the emission of these engines; however, the effect of this parameter has not been investigated in experimental studies of rcci gasoline/biodiesel combustion. consequently, the changes in the injection timing of waste oil biodiesel (combined with diesel), as a high-cetane fuel and high-octane gasoline fuel, in an rcci engine were investigated experimentally in this research. the results indicated that soi changes in the completely steady operation range of the engine can cause a change of around 9.2% in brake thermal efficiency when the engine operates in rcci mode with a premixed fuel ratio of 27%. also, it was found that the soi timing of 30°btdc can lead to a lower level of nox emission than the other injection angles while maintaining relatively higher values of brake power.

experimental investigation of injection timing effect on rcci engine using waste oil biodiesel as high reactive fuel

three major threats that endanger human life and the planet are the escalating pollution levels, the intensifying global warming, and the rapid depletion of fossil fuel resources. these challenges have prompted researchers to explore the use of alternative fuels that are widely available, renewable, and have lower pollution emissions. biodiesel obtained from waste oil has almost all these characteristics. considering the objectives of the sustainable development goals in increasing the use of biodiesel in the future, it is essential to investigate the performance of this fuel in next-generation internal combustion engines such as reactivity-controlled compression ignition (rcci) engines. the start of injection (soi) parameter in rcci engines is important to find suitable performance intervals and optimize the emission of these engines; however, the effect of this parameter has not been investigated in experimental studies of rcci gasoline/biodiesel combustion. consequently, the changes in the injection timing of waste oil biodiesel (combined with diesel), as a high-cetane fuel and high-octane gasoline fuel, in an rcci engine were investigated experimentally in this research. the results indicated that soi changes in the completely steady operation range of the engine can cause a change of around 9.2% in brake thermal efficiency when the engine operates in rcci mode with a premixed fuel ratio of 27%. also, it was found that the soi timing of 30°btdc can lead to a lower level of nox emission than the other injection angles while maintaining relatively higher values of brake power.