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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...
The pressure history in the explosion syngas/air mixtures with H2O addition over a wide range of equivalence ratios at elevated temperatures was recorded to study the explosion characteristics in a constant volume confined vessel. CO mole fractions in syngas are from 0.5 to 0.95, initial temperatures are from 373K to 473K, and H2O addition ratios are from 0 to 30%. The explosion parameters such as...
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...
The intrinsic instability of laminar flame is one of the classic subjects in flame dynamics, which presents the dynamic response of laminar premixed flamelets to weak perturbations. The instabilities of laminar premixed CH4/H2/air flames stabilized on a non-adiabatic McKenna burner were investigated. The quantitative parameters of flame front were measured by OH-PLIF (Planar Laser Induced Fluorescence)...
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...
A novel combination method of γ-ray irradiation and electrochemical hydrogenation was developed for Shenhua coal liquefaction, which was enhanced to generate higher cathodic hydrogenation reaction current and better liquefaction yield. The irradiated coal and the liquefaction products were analyzed by scanning electron microscopy (SEM), Brunauer–Emmett–Teller measurement (BET), infrared spectroscopy...
Cellular instability of non-adiabatic laminar premixed flat methane/hydrogen oxy-fuel flames highly diluted with CO 2 was studied systematically. The CH 4 /H 2 /CO 2 /O 2 flames were stabilized on a McKenna burner at atmospheric pressure. The CH 4 /H 2 /CO 2 /O 2 flames with varied equivalence ratios and hydrogen mole fractions...
In this paper, combustion characteristics of a direct-injection spark-ignited engine fueled with natural gas–hydrogen blends under various ignition timings and lean mixture condition were investigated. The results show that the ignition timing has significant influence on engine performance, combustion and emissions. The time intervals between the end of fuel injection and ignition timing are very...
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