On the Influence of H 2 Addition on NH 3 Laminar Flame Speed under Engine-like Conditions

Flavio Bochicchio, Marco D’Amato, Vinicio Magi and Annarita Viggiano ()
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Flavio Bochicchio: Dipartimento di Ingegneria, Università degli Studi della Basilicata, 85100 Potenza, Italy
Marco D’Amato: Dipartimento di Ingegneria, Università degli Studi della Basilicata, 85100 Potenza, Italy
Vinicio Magi: Dipartimento di Ingegneria, Università degli Studi della Basilicata, 85100 Potenza, Italy
Annarita Viggiano: Dipartimento di Ingegneria, Università degli Studi della Basilicata, 85100 Potenza, Italy

Energies, 2024, vol. 17, issue 16, 1-23

Abstract: As zero-carbon fuels, hydrogen and ammonia are of great interest in the transition toward a climate-neutral transportation system. In order to use these fuels and their blends in reciprocating engines, a characterization of the combustion of NH 3 /H 2 /air mixtures at high pressures and temperatures is needed. The aim of this work is to compute the Laminar Flame Speed (LFS) of NH 3 /H 2 /air mixtures by varying the thermochemical conditions of the reactants. For this purpose, several simulations have been carried out using different kinetic reaction mechanisms. The accuracy of the model has been assessed by comparing the results with experimental data available in the scientific literature. Finally, the influence of mixture composition and thermodynamic conditions of the reactants on LFS has been assessed by considering temperature and pressure values relevant to automotive applications and not yet explored in the literature. By adding H 2 to NH 3 /air mixtures, LFS increases exponentially. By plotting the logarithm of LFS as a function of the H 2 mole fraction, the numerical results are well fitted by using a second-degree polynomial regression. However, a linear regression is accurate enough if the H 2 mole fraction does not exceed 0.6. Regarding the effect of pressure, the decrease in LFS with increasing pressure is less important as pressure increases. On the other hand, LFS increases with temperature, and this effect is more pronounced as the H 2 mole fraction decreases and pressure increases.

Keywords: e -fuels; hydrogen; ammonia; laminar flame speed; engine-like conditions; zero-carbon combustion; climate neutrality (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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