Experimental investigation on laminar burning velocities of ammonia/hydrogen/air mixtures at elevated temperatures
By C. Lhuillier, P. Bréquigny, N. Lamoureux, Francesco Contino, C. Mounaïm-Rousselle. Fuel, 2020
434 citations recorded by the source corpus.
Abstract The present study introduces new laminar burning velocity data for ammonia/hydrogen/air mixtures measured by means of the outwardly propagating spherical flame method at atmospheric pressure, for previously unseen unburned gas temperatures ranging from 298 to 473 K, hydrogen fractions ranging from 0 vol% to 60 vol% in the fuel and equivalence ratios in the range [0.8–1.4]. Results show increasing velocities with increasing hydrogen fraction and temperature, with maximum values obtained for rich mixtures near stoichiometry. The new experimental dataset is compared to dedicated laminar burning velocity correlations from the literature and to simulations using detailed kinetic mechanisms. The ammonia/air correlation presents a good agreement with measurements over the whole range of experimental conditions. The ammonia/hydrogen/air correlation captures the effect of the initial temperature satisfactorily for equivalence ratios below 1.3 and hydrogen fractions below 50 vol% in the fuel, but discrepancies are observed in other conditions. The effect of hydrogen addition is reproduced satisfactorily for hydrogen fractions between 20 and 40 vol% in the fuel, but discrepancies are observed for rich mixtures below 20 vol% hydrogen and for all mixtures containing 50 vol% hydrogen and more. An optimization of both correlations is proposed thanks to the experimental data obtained, but only with partial improvement of the ammonia/hydrogen/air correlation. State-of-the-art detailed kinetic reaction mechanisms yield values in close agreement with the present experiments. They could thus be used along with additional experimental data from different techniques to develop more accurate correlations for time-effective laminar burning velocity estimates of NH3/H2/air mixtures.
Subfields: Aerospace Engineering, Computational Mechanics, Fluid Flow and Transfer Processes
View Paper: https://www.semanticscholar.org/paper/6a8e043f186c2ea4c69808bed7db5659f1154d5b
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Fluid Flow and Transfer Processes
Citations in the corpus
- Experimental investigation on ammonia combustion behavior in a spark-ignition engine by means of laminar and turbulent expanding flames (2020, methodology): “The constant-volume spherical vessel used in the present study was fully described in [27], along with the experimental procedure that was updated with ammonia flames specificities in [9].”
- An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature (2021, methodology): “1) to extend laminar flame speed data already published in [11], in the case of NH3/H2 blend at higher pressure than atmospheric one, and also in the case of neat NH3 with enriched O2 conditions.”