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Showing papers in "Combustion and Flame in 2021"


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the oxidation of ammonia (NH3)/hydrogen (H2) mixtures at intermediate temperatures and developed a kinetic model for pure NH3 and NH3/H2 mixtures.

96 citations


Journal ArticleDOI
TL;DR: In this article, both ignition delay times and laminar flame speeds of pure methanol, n-heptane and their blends at various blending ratios were measured at engine-relevant conditions.

93 citations


Journal ArticleDOI
TL;DR: In this article, an experimental and kinetic modeling study on the laminar flame propagation of partially cracked NH3/air mixtures (NH3/H2/N2/AIR mixtures) up to 10 atm.

87 citations


Journal ArticleDOI
TL;DR: In this paper, the effects of oxygen-free and oxygen-containing aliphatic and aromatic hydrocarbons on soot formation were investigated in laminar coflow diffusion flames of a n-heptane and iso-octane mixture doped sequentially with cyclohexane, n-hexane and ethanol.

76 citations


Journal ArticleDOI
Zhihua Wang1, Xinlu Han1, Yong He1, Runfan Zhu1, Yanqun Zhu1, Zhijun Zhou1, Kefa Cen1 
TL;DR: In this paper, a new kinetic mechanism, based on the previous mechanism named CEU-NH3, was proposed and validated based on experimental data for laminar burning velocity, ignition delay times and species profiles, which is small in size and thus advantageous to be used in the modeling of complex combustion fields.

71 citations


Journal ArticleDOI
TL;DR: In this article, the NH3/DME mechanism was developed, including modifications in NH3 subset and addition of the NH2+CH3OCH3 reaction, with rate coefficients calculated from ab initio theory.

71 citations


Journal ArticleDOI
TL;DR: In this paper, a cobalt-based MOF-71-NH2 was synthesized and further modified with phosphonitrilic chloride trimer (PCT) by a post-synthesis modification (PSM) strategy, which was used to enhance the flame retardancy of polystyrene.

68 citations


Journal ArticleDOI
TL;DR: In this paper, the authors show that plasma can simultaneously reduce NOx emission and extend the lean blowoff limits of ammonia flames, which is a significant improvement from previous work using hydrocarbon fuels in which plasma promoted NOx emissions.

56 citations


Journal ArticleDOI
TL;DR: In this article, the laminar burning velocities of NH3+N2O+air flames were measured using the heat flux method at 1 atm and 298 K, with varied equivalence ratios and N2O mixing ratios.

45 citations


Journal ArticleDOI
TL;DR: An improved particle generator based on electrodynamic powder fluidization is proposed and constructed for investigating single metal particle's combustion in this article, which is able to generate an iron particle moving upward with a well controlled velocity and trajectory and ignite it at near-uniform conditions by an infrared laser beam with flattened elliptical beam profile Mechanically sieved narrow fractions of spherical iron particles with mean sizes in the range of around 26-54 μ m were used in experiments Particle’s trajectories, velocities, and arbitrary radiant intensities were measured by taking images with a high-

43 citations


Journal ArticleDOI
TL;DR: In this paper, the authors studied the heat release distribution, combustion instability characteristics and flow dynamics of lean swirl-stabilized flames of hydrogen enriched natural gas using time-resolved (10 kHz) stereo PIV, OH* chemiluminescence imaging and acoustic pressure measurements.

Journal ArticleDOI
TL;DR: In this paper, a rapid compression machine (RCM) was used to quantify autoignition and preliminary heat release characteristics for blends of 0 to 30% ethanol by volume into two surrogates (FGF-LLNL and FGF-KAUST) that represent a full boiling range gasoline (FACE-F).

Journal ArticleDOI
TL;DR: The optimized mechanism was found to improve the nominal one, showing a satisfactory agreement over the entire range of operating conditions, and the use of ‘curve matching’ indices was finding to outperform the adoption of L1 and L2 norms.

Journal ArticleDOI
TL;DR: In this paper, numerical simulations with detailed chemistry are conducted for two-dimensional rotating detonative combustion with separate injection of fuel and oxidant, and the influences of the fuel and oxide compositions on combustion mode and detonation wave multiplicity are studied.

Journal ArticleDOI
TL;DR: The authors at Physico-Chemical Fundamentals of Combustion (PCFC), RWTH Aachen University, would like to recognize the funding support from the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) through the project number 322460823 (HE7599/2-1) as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, both a high-pressure shock tube and a rapid compression machine have been employed to measure ignition delay times of 1- and 2-pentene over a wide temperature range (600-1300 K) at equivalence ratios of 0.5, 1.0 and 2.0 in "air" and at pressures of 15 and 30 atm.

Journal ArticleDOI
TL;DR: In this article, the spectral dependence of the soot absorption function is used to characterize the maturity of a laminar axisymmetric co-flow ethylene diffusion flame.

Journal ArticleDOI
TL;DR: In this article, a detailed chemical kinetics mechanism for NH3 pyrolysis is proposed using the data from the present study as a guide, along with NH3 data from literature, using a laser absorption diagnostic near 10.4 µm.

Journal ArticleDOI
TL;DR: In this article, the turbulent flame speed (ST) of stoichiometric ammonia/oxygen/nitrogen mixtures under oxygen enrichment conditions was investigated at elevated pressures using a fan-stirred constant volume combustion chamber.

Journal ArticleDOI
TL;DR: In this article, the relationship between pre-chamber jet and main chamber ignition in the prechamber combustion (PCC) of an optical engine, fueled with methane and equipped with two rows of orifices was studied.

Journal ArticleDOI
TL;DR: In this article, an alcohol-thermal technique is adopted to synthesize approximately core-shell structured Al@CuO MICs, in which process copper acetate is used as the precursor of CuO while Al powder with a wide size distribution (50 nm−5 µm in diameter) was used as cores.

Journal ArticleDOI
TL;DR: In this paper, the authors report on the chemiluminescence footprint of premixed ammonia-methane-air flames and identify several excited radicals, such as NO*, OH*, NH*, CN*, CH*, and CO2* as a potential surrogate for equivalence ratio even if the ammonia fuel fraction in the fuel blend is not known accurately.

Journal ArticleDOI
TL;DR: In this article, the authors present simultaneous measurements of forty-eight gaseous species through gas capillary-sampling followed by chemical analysis and particle properties by optical techniques, which enabled them to follow quantitatively the transition from parent fuel molecule to polycyclic aromatic hydrocarbons and, eventually, soot.

Journal ArticleDOI
TL;DR: In this article, a phenolic-assisted hydrogen transfer (phenolics-AHT) process for the concerted reactions of lignin is confirmed and carefully investigated, and the phenolic products participate in the hydrogen transfer process of the concerted Maccoll elimination reaction by means of their phenolic hydroxyl structures and significantly reduce the energy barrier, thus promoting the cleavage of the β-O-4 linkage.

Journal ArticleDOI
TL;DR: An on-the-fly artificial neural network framework has been developed for the tabulation of chemical reaction terms in direct numerical simulations of premixed and igniting flames to overcome the extrapolation issue of the monolithic ANN model.

Journal ArticleDOI
TL;DR: In this paper, the impact of fuel distribution on flame stabilization and local combustion modes in a cavity-based scramjet was investigated, and two injection schemes with a global equivalence ratio of 0.4 were comparatively studied.

Journal ArticleDOI
TL;DR: In this article, the process of spontaneous ignition of hydrogen flames at laminar, turbulent, adiabatic and non-adiabatic conditions was investigated and a quantitative characterization of the instantaneous fuel consumption rate within the reaction front was obtained.

Journal ArticleDOI
TL;DR: In this paper, the effects of atmosphere and pressure on the ignition and combustion characteristics of micro-and nano-sized B under different pressures (0.4, 0.8 and 1.2 ) and atmospheres (60% O2+40% N2, 80% O 2 + 20% N 2, 80% B6O+20% BN 2, and 100% B2O3) were studied.

Journal ArticleDOI
TL;DR: In this paper, a data-assisted approach that employs random forest classifiers for local and dynamic submodel assignment in turbulent-combustion simulations is proposed, which is demonstrated in simulations of a single-element GOX/GCH4 rocket combustor.

Journal ArticleDOI
TL;DR: In this paper, three potential methods of tailoring the burning rate of Al/PVDF filaments were investigated: (1) selecting different aluminum fuel particles, (2) adjusting the stoichiometry of the material, and (3) changing the fuel particle size ratio from pure micro-to pure nano-aluminum.