Experimental and kinetic modeling investigation on the laminar flame propagation of ammonia under oxygen enrichment and elevated pressure conditions

Experimental investigation on laminar burning velocities of ammonia/hydrogen/air mixtures at elevated temperatures

“…The extensive dataset obtained during the present study is available in the Supplementary Material. different techniques by Han et al [22] and Mei et al [17]. Error bars are asymmetric due to the positive-only radiation-induced uncertainty, which is especially significant at low LBVs.…”

“…In an attempt to optimize the correlations proposed by Goldmann and Dinkelacker [32], the new experimental dataset was used to adjust the coefficient correlations for P u ≤ 0.5 MPa and T u ≤ 700 K. To that end, the present LBV experimental dataset was consolidated with the literature data [10,11,[20][21][22][12][13][14][15][16][17][18][19] and used to fit the correction factor by means of a least-squares algorithm. The form of the correction factor was extended by introducing two new coefficients and to take into account the temperature dependence, analogously to the pressure dependence: .…”

“…Following these considerations, several studies focused on ammonia combustion, addressing many of the remaining challenges regarding NH 3 fundamental combustion properties, chemical kinetics modeling or combustion in gas turbines and internal combustion engines as single or dual fuel [8,9]. A major drawback of NH 3 as a fuel is its very low combustion intensity, as illustrated by its Laminar Burning Velocity (LBV), which is one order of magnitude smaller than that of conventional hydrocarbons in atmospheric conditions [10][11][12][13][14][15][16][17]. This represents a challenge for NH 3 as a fuel in practical combustion systems, but also for laminar flame experiments themselves, as noted by Pfahl et al [12], Takizawa et al [14] and Hayakawa et al [15].…”

“…Therefore, the correlation of Yu et al was used presently as the best estimate for the radiation-induced uncertainty, , added only in the positive uncertainty, and decreasing with increasing LBV down to less than 1% for fast flames. The same estimation method was recently used by Mei et al[17]. [Tapez ici]…”

An experimental, theoretical and kinetic-modeling study of the gas-phase oxidation of ammonia

“…Therefore, in this work the capability of the developed mechanism in predicting laminar flame speed is verified by using the experimental data collected by Ronney 81 under microgravity conditions. For the sake of completeness, recent results obtained by Mei et al 83 under gravity conditions, but in a more limited range of equivalence ratios are added. Moreover, Nakamura and Shindo 86 recently showed that, differently from methane flames, the effects of radiation heat loss on NH 3 flame speeds at ambient T and P were significant in a wide range of Φ, with a particular emphasis on lean and rich conditions.…”