Empirical Modeling of Synthetic Fuel Combustion in a Small Turbofan

Andrzej Kulczycki, Radoslaw Przysowa, Tomasz Białecki, Bartosz Gawron, Remigiusz Jasiński (), Jerzy Merkisz and Ireneusz Pielecha
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Andrzej Kulczycki: Air Force Institute of Technology (ITWL), ul. Księcia Bolesława 6, 01-494 Warsaw, Poland
Radoslaw Przysowa: Air Force Institute of Technology (ITWL), ul. Księcia Bolesława 6, 01-494 Warsaw, Poland
Tomasz Białecki: Air Force Institute of Technology (ITWL), ul. Księcia Bolesława 6, 01-494 Warsaw, Poland
Bartosz Gawron: Air Force Institute of Technology (ITWL), ul. Księcia Bolesława 6, 01-494 Warsaw, Poland
Remigiusz Jasiński: Faculty of Civil and Transport Engineering, Poznan University of Technology, ul. Piotrowo 3, 60-965 Poznan, Poland
Jerzy Merkisz: Faculty of Civil and Transport Engineering, Poznan University of Technology, ul. Piotrowo 3, 60-965 Poznan, Poland
Ireneusz Pielecha: Faculty of Civil and Transport Engineering, Poznan University of Technology, ul. Piotrowo 3, 60-965 Poznan, Poland

Energies, 2024, vol. 17, issue 11, 1-19

Abstract: Drop-in fuels for aviation gas-turbine engines have been introduced recently to mitigate global warming. Despite their similarity to the fossil fuel Jet A-1, their combustion in traditional combustors should be thoroughly analyzed to maintain engine health and low emissions. The paper introduces criteria for assessing the impact of the chemical composition of fuels on combustion in the DEGN 380 turbofan. Based on previous emission-test results, the power functions of carbon monoxide and its emission index were adopted as the model of combustion. Based on the general notation of chemical reactions leading to the production of CO in combustion, the regression coefficients were given a physical meaning by linking them with the parameters of the kinetic equations, i.e., the reaction rate constant of CO and CO 2 formation expressed as exponential functions of combustor outlet temperature and the concentration of O 2 in the exhaust gas, as well as stoichiometric combustion reactions. The obtained empirical functions show that, in the entire range of engine operating parameters, synthetic components affect the values of the rate constants of CO and CO 2 formation. It can be explained by the change in activation energy determined for all chain-of-combustion reactions. The activation energy for the CO formation chain changes in the range between 8.5 kJ/mol for A0 and 24.7 kJ/mol for A30, while for the CO 2 formation chain between 29.8 kJ/mol for A0 and 30.8 kJ/mol for A30. The reactivity coefficient lnα iCO A CO D CO changes between 2.29 for A0 and 6.44 for A30, while lnα iCO2 A CO2 D CO2 changes between 7.90 for A0 and 8.08 for A30.

Keywords: combustion modeling; exhaust emission; gas-turbine engine; chemical kinetic; sustainable aviation fuel; synthetic kerosene (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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