High-speed planar laser-induced fluorescence (PLIF) and 3-D large eddy simulations (LES) are used to study turbulent flame kernel growth, wrinkling and the formation of separated flame pockets in methane/air mixtures. Turbulence was effected by a set of rotary fans situated in a cylindrical enclosure. Flame wrinkling was followed on sequential 2-D OH images captured at kHz repetition rates. Und...

The formation of nitric oxide was investigated in methane diffusion flames under the perturbation of laminar vortices. Laser-induced fluorescence and Raman spectroscopy were used to measure nitric oxide, major species, and temperature, and to obtain the time evolution of the scalar dissipation rate at the stoichiometric surface during the flame/vortex interaction. Vortices with two characterist...

The flame stability limit, which was involving the critical flow condition, lift off and blow out, could be affected by the burner geometry in the combustion system installation. Consequently a flame holder should be put in, to hold the flame as big as possible on a stable condition. The flame holder itself, is a device to hold the flame, whereas the flame holder could disturb the air and fuel ...

Ammonia is a promising alternative fuel for CO2 emission mitigation. The use of ammonia blends allows more flexibility compared to pure and often considered immediate reduction in existing facilities running on natural gas. However, fundamental studies these mixtures remain scarce. This study thus focuses ammonia/methane blend fuels. effect methane jet flame stabilization investigated using non...

The effect of water droplets on strained methane-air laminar flames is investigated using particle image velocimetry both gas and liquid phases. We use the impinging flame configuration to measure speed (gas) as well motion phase, simultaneously. Water mean diameter 36.6 µm are produced by an ultrasonic atomizer dispersed in a methane/air flow, for constant molar ratio (12–36%) fuel (methane). ...