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• W2091364488 abstract "In this work, numerical simulations on the laminar premixed C1–C4 n-alkanes with various hydrogen addition fractions ( X h ) were conducted. Flame parameters, including laminar flame speed, adiabatic flame temperature ( T ad ), flame thickness ( δ l ), Lewis number ( Le ), Zeldovich number ( Ze ) and Markstein number ( Ma ) were calculated. Results show that hydrogen addition alters all flame parameters, especially at the sufficiently large X h region. Based on one step overall reaction assumption, the hydrogen addition effect is demonstrated through three factors and it was found that the change in overall activation energy which represents the combustion kinetics, is the most prominent, compared to the change in adiabatic flame temperature and Lewis number. Detailed flame structure profiles show that the laminar flame speeds of all mixtures are linearly correlated with the maximum (H + OH) mole fraction and increase with X h . To further understand the chemical kinetic effect of hydrogen addition on the increase of laminar flame speed, the reaction flux and rate of consumption of key radicals were examined. It is shown that at the small X h region, the proportion of H radical consumption from R88 (CH 3 +H(+M) = CH 4 (+M)) increases, while the proportion of H radical consumption from R1 (H + O 2 = O + OH) decreases, thus relatively less OH radicals are produced. As a consequence, the increase in laminar flame speeds by hydrogen addition is slowed down. While at the large X h region, the proportion of H radical consumption from R88 decreases dramatically, and the chain sequence R12 (H + O 2 (+M) = HO 2 (+M))/R16 (HO 2 + H = OH + OH) which is not sensitive at small X h region is activated and significant amount of OH radicals are generated, leading to the remarkable increase of the laminar flame speed. • The dependences of the premixed flame parameters of C1–C4 n-alkane-air mixtures with hydrogen addition were revealed. • The modification of the combustion kinetics was found to be the most prominent in flame speed enhancement. • A linear empirical correlation between the maximum (H + OH) mole fraction and X h was proposed. • Rate of consumption of key radicals were examined and variations were found between the small and large X h region." @default.
• W2091364488 created "2016-06-24" @default.
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• W2091364488 date "2015-01-01" @default.
• W2091364488 modified "2023-10-17" @default.
• W2091364488 title "Kinetic analysis of H 2 addition effect on the laminar flame parameters of the C1–C4 n-alkane-air mixtures: From one step overall assumption to detailed reaction mechanism" @default.
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• W2091364488 doi "https://doi.org/10.1016/j.ijhydene.2014.11.010" @default.
• W2091364488 hasPublicationYear "2015" @default.
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