Banca de DEFESA: JARMISON DE ARAÚJO SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JARMISON DE ARAÚJO SILVA
DATE: 31/08/2022
TIME: 14:00
LOCAL: PPGEM
TITLE:

Modeling and Simulation of Miller, Otto and Diesel Engine Cycles: A Comparative Study Based on Emissions and Operating Parameters.

KEY WORDS:

Miller Engine, Otto, Diesel, Numerical Simulation, NOx, Chemical Equilibrium, Chemical Kinetics.

PAGES: 91
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

Internal combustion engines represent an important equipment for energy transformation/generation and are widely used in the energy and transport sectors. This condition, combined with the intensive use of fossil fuels, causes environmental problems in the use of these equipments. As a way of contributing to the search for improvements in the energy efficiency of engines and in the mitigation of environmental problems, the present work evaluates the use of a Miller cycle as a counterpart to the Otto and Diesel cycles. The analysis is based on numerical simulation studies of the motor cycles involved. The model was built considering the thermodynamic processes that occur at each engine stroke, including the heat transfer through the cylinder walls, the opening and closing of valves and the combustion process. The model also includes an analysis of pollutant formation and this is evaluated through chemical equilibrium conditions and kinetics of combustion reactions. The model equations are solved using the finite difference method through an algorithm programmed in Matlab. The model was validated with experimental results from the literature. From the analysis, it is observed that the Miller engine has a lower level of specific NOx emission when compared to the Otto and Diesel engines. Additionally, emission tends to be lower with increasing angle at which the intake valve remains open during the compression stage and will also be lower with increasing engine RPM. With the increase in the delay of closing the intake valve during compression, the Miller engine develops a lower torque and power than the Diesel and Otto engines, consequently, the specific fuel consumption of the Miller engine will be higher.

BANKING MEMBERS:
Interno - 016.219.824-83 - ALVARO ANTONIO OCHOA VILLA - IFPE
Externo à Instituição - CARLOS ANTONIO CABRAL DOS SANTOS - UFPB
Externo à Instituição - CARLOS TEOFILO SALINAS SEDANO
Presidente - 1420628 - JORGE RECARTE HENRIQUEZ GUERRERO
Interno - 027.889.084-90 - JOSE ANGELO PEIXOTO DA COSTA - IFPE