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                <term xml:lang="en">Reaction mechanisms</term>
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              <p>The importance of ammonia as an alternative fuel for mitigating global warming emissions from the environment has become a growing topic in the research community. Due to the viability of ammonia as a hydrogen energy carrier, the molecule has encouraged considerable research towards its utilization as a combustion fuel. To understand the combustion characteristics of ammonia as a prospective fuel in internal combustion engines and gas turbines, the premixed laminar burning velocity of a binary fuel consisting of NH3-H2 has been investigated experimentally and numerically. A series of experiments using the spherical expanding flame set-up was employed to measure the laminar burning velocity of a 70NH3/30H2 (%vol) blend of ammonia/hydrogen, at standard temperature and pressure across a wide range of equivalence ratios (0.8 – 1.4). ANSYS CHEMKIN-Pro software was used to perform an extensive numerical modelling analysis, appraising for 36 kinetic reaction mechanisms. Results show how some widely employed kinetic models are not able to accurately predict the Laminar flame speed, especially at leanest conditions. The kinetic mechanism of Duynslaegher et al. (2012) shows the ability to estimate lean conditions with minimal discrepancy and therefore has been identified as the best for estimation of premixed Laminar flame speed in lean conditions. Meanwhile, the kinetic reaction mechanism of Nakamura et al. (2017), demonstrates a good estimation with a small error when the equivalence ratio varies from 1.2 and 1.4.</p>
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