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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
CHARACTERIZATION OF COMBUSTION PARAMETERS IN A SPARK-IGNITION ENGINE USING H2 AS FUEL
Submission Author:
Nina Salau , RS , Brazil
Co-Authors:
Thompson Diordinis Metzka Lanzanova, Juliano Pereira Silveira, Andrey Pereira, Jean Fagundez, Vinícius Roso, Mario Martins, Nina Salau
Presenter: Jean Fagundez
doi://10.26678/ABCM.ENCIT2022.CIT22-0562
Abstract
In the search for novel fuels that can reduce both greenhouse gas (GHG) and pollutant emissions of the transport sector, hydrogen appears as a promising alternative capable of zeroing vehicle CO2 emissions, being considered one of the fuels of the future. However, for relevant GHG emissions reduction when using H2, its production must be clean and renewable, such as from water electrolysis provided no fossil energy is used in the process. In such cases, the hydrogen obtained has zero well-to-wheel CO2 emissions and it is called green hydrogen. The simple application of hydrogen as a fuel in internal combustion engines is well known and was studied several decades ago. Nevertheless, it was not taken as a serious solution until recently and its use with modern engine technology is still not completely developed. In this regard, this work aims to investigate some operating conditions and combustion characteristics of H2 in a spark-ignition engine with port fuel injection. Six load conditions were analyzed: 2.3, 3.1, 3.8, 4.4 bar IMEP, with excess air ratio (λ) varying from 2.7 up to 5.5. Combustion and performance variables such as IMEP, COVIMEP, heat release ratio (HRR), indicated efficiency were evaluated. All tests were conducted aiming at reaching minimum spark advance for best torque (MBT). The results showed that operation was stable even with high λ such as 5.5. In addition, indicated efficiency is up to 37%, considerably higher than when operating the same engine at lower loads with ethanol or Brazilian gasoline under stoichiometric conditions. Best engine indicated efficiency were found in conditions where λ was between 2.7 and 3.3 and 50% of mass fraction burned was closer to the top dead center. Thus, the operation with H2 showed potential for high engine efficiency while decarbonizing vehicle emissions.
Keywords
Hydrogen, Internal combustion engine, Combustion, Lean operation
