Journal Article
Simulation Study of Water Injection Strategy in Improving Cycle Efficiency Based on a Novel Compression Ignition Oxy-Fuel Combustion Engine
2018-04-03
2018-01-0894
The present work discusses a novel oxy-fuel combustion cycle utilized in compression ignition internal combustion engine. The most prominent feature of this cycle is that the air intake is replaced by oxygen; therefore nitric oxide (NOX) emission is eliminated. ...As water injection is already utilized in gasoline engine to control knocking, the utilization of water injection in optimizing oxy-fuel combustion process has been tested in this study. To understand the relationship between water injection strategy and cycle efficiency, computational fluid dynamics (CFD) simulations were carried out. ...The simulation results show that the injected water absorbs combustion heat to evaporate; therefore increased amount of working fluid leads to higher cycle efficiency. As water injection quantity increases, the water consumes too much heat and thus deteriorates combustion leading to lower cycle efficiency.