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Laminar flame speed correlations of ammonia/hydrogen mixtures at high pressure and temperature for combustion modeling applications.

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Title: Laminar flame speed correlations of ammonia/hydrogen mixtures at high pressure and temperature for combustion modeling applications.
Authors: Pessina, V.1 (AUTHOR) valentina.pessina@unimore.it, Berni, F.1 (AUTHOR), Fontanesi, S.1 (AUTHOR), Stagni, A.2 (AUTHOR), Mehl, M.2 (AUTHOR)
Source: International Journal of Hydrogen Energy. Jul2022, Vol. 47 Issue 61, p25780-25794. 15p.
Subjects: Hydrogen flames, Flame, High temperatures, Combustion, Chemical kinetics, Burning velocity, Ammonia
Abstract: Ammonia/hydrogen mixtures are among the most promising solutions to decarbonize the transportation and energy sector. The implementation of these alternative energy carriers in practical systems requires developing suitable numerical tools, able to estimate their burning velocities as a function of both thermodynamic conditions and mixture quality. In this study, laminar flame speed correlations for ammonia/hydrogen/air mixtures are provided for high pressures (40 bar–130 bar) and elevated temperatures (720 K–1200 K), and equivalence ratios ranging from 0.4 to 1.5. Based on an extensive dataset of chemical kinetics simulations for ammonia/hydrogen blends (0-20-40-60-80-90-100 mol% of hydrogen), dedicated correlations are derived using a regression fitting. Besides these blend-specific correlations, a generalized (i.e., hydrogen-content adaptive) formulation, with hydrogen content used as additional parameter, is proposed and compared to the dedicated correlations. • Ammonia/air mixtures with increasing hydrogen content for wide range of conditions. • Chemical kinetics simulations are performed at high pressures and temperatures. • Blend-specific correlations are developed for combustion CFD codes. • A generalized and hydrogen-content adaptive correlation is derived. • Limited prediction error and satisfying comparison with state-of-art is achieved. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Ammonia/hydrogen mixtures are among the most promising solutions to decarbonize the transportation and energy sector. The implementation of these alternative energy carriers in practical systems requires developing suitable numerical tools, able to estimate their burning velocities as a function of both thermodynamic conditions and mixture quality. In this study, laminar flame speed correlations for ammonia/hydrogen/air mixtures are provided for high pressures (40 bar–130 bar) and elevated temperatures (720 K–1200 K), and equivalence ratios ranging from 0.4 to 1.5. Based on an extensive dataset of chemical kinetics simulations for ammonia/hydrogen blends (0-20-40-60-80-90-100 mol% of hydrogen), dedicated correlations are derived using a regression fitting. Besides these blend-specific correlations, a generalized (i.e., hydrogen-content adaptive) formulation, with hydrogen content used as additional parameter, is proposed and compared to the dedicated correlations. • Ammonia/air mixtures with increasing hydrogen content for wide range of conditions. • Chemical kinetics simulations are performed at high pressures and temperatures. • Blend-specific correlations are developed for combustion CFD codes. • A generalized and hydrogen-content adaptive correlation is derived. • Limited prediction error and satisfying comparison with state-of-art is achieved. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2022.06.007