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Thickened flame (TF) model is one of the effective methods to resolve the flame front in turbulent premixed combustion modeling. The multi-step reaction mechanism is becoming increasingly important for combustion simulations such as pollutant formation, ignition and extinction. The effect of TF model on flame structures when coupling with multi-step reaction mechanism was investigated. The simulation...
Laminar burning velocities and Markstein lengths of CH4/O2/N2 mixtures were measured in a constant volume combustion chamber over a wide range of O2 contents and equivalence ratios at elevated pressures. The laminar burning velocities were extracted using an accurate nonlinear methodology with properly chosen flame radii to reduce the systematic uncertainty. Chemical kinetic simulation was conducted...
Effects of stretch and preferential diffusion on tip opening of laminar premixed Bunsen flames of syngas/air mixtures were investigated with experiments and numerical simulation. The reaction zone of the laminar flames at different hydrogen fractions (XH2=0.6, 0.8), equivalence ratios (φ=0.6–1.0) and Reynolds numbers (Re=1400, 1800) was obtained by OH-PLIF technique, while the species profile, velocity...
Solvent extractions of two different types of Chinese rich coals i.e. Aiweiergou coal (AG) and Zaozhuang coal (ZZ) using the mixed solvent of carbon disulfide/N-methyl-2-pyrrolidinone (CS 2 /NMP) with different mixing ratios were carried out and the caking indexes of the extracted residues were measured. It was found that the extracted residues from the two types of coals showed different...
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