Analysis of different combustion chamber geometries using hydrogen / diesel fuel in a diesel engine
Tarih
2021Üst veri
Tüm öğe kaydını gösterÖzet
In this study, the effects on combustion characteristics and emission were
investigated in a direct injection diesel engine. In experimental and numerical
studies, the engine was operated at 2000 rpm. The analyzes were made
in the AVL-FIRE ESE Diesel part with Computational Fluid Dynamics (CFD)
software. Standard combustion chamber (SCC) and Modified combustion
chamber (MCC) geometry were compared in the modeling. By means of
the designed MCC combustion chamber geometry, the fuel released from
the injector was directed to the piston bowl area. Therefore, the mixture was
homogenized and the combustion had been improved. In addition, the
evaporation rate of the mixture increased with the MCC geometry. Also,
lower NO and CO emissions were obtained with the MCC model compared
to the SCC model. On the other hand, diesel fuel and mass 5% hydrogen fuel
was used into diesel fuel as fuel in the study. The combustion process was
investigated using hydrogen in different combustion chambers. The use of
hydrogen as additional fuel resulted in higher combustion pressure, temperature
and NO emissions. Compared to SCC type combustion chamber in
the MCC type combustion chamber used diesel fuel, CO emission decreased
of 6% and 3% for hydrogen-added mixture fuel. Also, compared to SCC type
combustion chamber in the MCC type combustion chamber used diesel fuel,
NO emission decreased of 11% and 32% for hydrogen-added mixture fuel.
Moreover, flame velocity, heat release rate and flame propagation increased
with the addition of hydrogen fuel.