Topic
Diffusion flame
About: Diffusion flame is a research topic. Over the lifetime, 9266 publications have been published within this topic receiving 233522 citations.
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TL;DR: In this paper, the accuracy of laminar flame speeds measured from outwardly propagating spherical flames is investigated and the change of the influence of different sources of uncertainty with initial pressure, initial temperature, and fuel carbon number is also discussed.
207 citations
TL;DR: In this paper, the formation of titania powders by oxidation of TiCl4 was studied in a laminar diffusion flame reactor, where the effects of flame configuration (fuel and oxidant flow rate and position) as well as precursor TiCl 4 loading on the specific surface area and phase composition of the product titania powder were investigated.
207 citations
TL;DR: In this paper, the limit of large activation energy for the process of simultaneous mixing and chemical reaction of two reactants undergoing a one-step irreversible Arrhenius reaction is studied.
Abstract: The limit of large activation energy is studied for the process of simultaneous mixing and chemical reaction of two reactants undergoing a one-step irreversible Arrhenius reaction. Consideration is restricted to problems of the evolution type—like unsteady mixing and boundary-layer combustion—for which the solution is uniquely determined in terms of the initial conditions. The continuous transition from the nearly-frozen to the near-equilibrium regimes is described. The analysis uncovers the existence of: (i) An ignition regime, in which a mixing layer develops with only minor effects of the chemical reaction, until a thermal runaway occurs somewhere within the mixing region; at this location chemical equilibrium then is established rapidly, (ii) A deflagration regime, in which premixed flames originate from the ignition point and move through the mixing region to burn completely the reactant not in excess. And (iii) a diffusion-flame regime, in which a thin diffusion flame, that is established w...
206 citations
TL;DR: In this article, a large-eddy simulation of a liquid-fueled lean-direct injection (LDI) combustor is carried out by resolving the entire inlet flow path through the swirl vanes and the combustor.
205 citations
01 Jan 1988
TL;DR: In this article, the symmetrical counterflow flame configuration and LDV mapping of the velocity profile were used to determine the flame speeds as a function of the equivalence ratio and stretch, as well as the stretch rates and associated flame speeds at the state of extinction.
Abstract: By using the symmetrical counterflow flame configuration and LDV mapping of the velocity profile, we have accurately determined for methane/air and propane/air mixtures their flame speeds as a function of the equivalence ratio and stretch, as well as the stretch rates and the associated flame speeds at the state of extinction. These data are expected to be quantitatively useful for the modeling of more complex flame and combustor phenomena. Results further show that for these mixtures the flame speed mostly increases linearly with increasing stretch, that the flame speed is finite at the state of extinction, and that the extinction limits for nearly adiabatic, stretchless, and planar flames appear to correspond to the flammability limits of the respective mixtures. Implications of the present results on the concept of flammability limits are also discussed.
205 citations