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: A burner-stabilized, stagnation flame technique is introduced in this paper, where a previously developed sampling probe is combined with a water-cooled circular plate such that the combination simultaneously acts as a flow stagnation surface and soot sample probe for mobility particle sizing.
146 citations
TL;DR: In this paper, a mathematical model for the dynamics of particle growth during synthesis of ultra fine particles in diffusion flames is presented, which includes the kinetics of particle coalescence and coagulation, and when combined with a calculation of the temperature, velocity and gas composition distribution in the flame, the effluent aerosol characteristics are calculated.
146 citations
01 Jan 2000
TL;DR: In this article, the interaction between the local flame structure produced by a premixed swirl-stabilized injector with combustion instabilities was experimentally studied for a model gas turbine combustor operating at high pressure and temperature.
Abstract: The interactions between the local flame structure produced by a premixed swirl-stabilized injector with combustion instabilities were experimentally studied for a model gas turbine combustor operating at high pressure and temperature. The model gas turbine combustor studied utilizes a sudden-expansion dump combustor with a single swirler and bluff body for enhancing mixing rate and flame stabilization, respectively. Laser-based measurements were made for both stable and unstable operating conditions. The local flame front structure was visualized using planar laser-induced fluorescence (PLIF) from the OH⊙, and the global heat release zone was interpreted from flame emission measurements. For stable combustion conditions, the mean reaction rate estimated independently from both OH-PLIF and OH * chemiluminescence measurements showed good agreement, thereby indicating confidence in the use of OH-PLIF measurements for extracting the local mean reaction rate. For unstable combustion conditions, the flamefront characteristics, including flame surface density and mean reaction rate, were evaluated together with the information from the OH * chemiluminescence measurements to identify the boundary of the heat release region at discrete phases of the unstable flame. Analysis of the flame structures during combustion instability indicated significant variations during different phases of the instability. The heat release flow field, particularly in the recirculation regions appearing at the corner and inner face of the dump plane, varied substantially. Rayleigh index information indicated that the recirculation zones play an important part in driving the instability. In contrast, the high shear layer formed along the interface between reactants and hot products produced a region where the instability was damped due to a lowering of the heat release.
145 citations
TL;DR: In this article, the authors used a flame model for coupled thermal radiation and soot production in a laboratory-scale rig, where the flame properties needed for model validation were measured at 1 and 3 atm.
145 citations
TL;DR: In this article, the effect of external flame stretching on the laminar burning velocities of spherically outward expanding flames is investigated using high-speed laser tomography and a tomographic image correlation method.
145 citations