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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 results of a supercritical water oxidation (SCWO) system with a transpiring wall reactor (TWR) containing a turbulent hydrothermal methanol diffusion flame as internal heat source are presented.
Abstract: Experimental results of a supercritical water oxidation (SCWO) system with a transpiring wall reactor (TWR) containing a turbulent hydrothermal methanol diffusion flame as internal heat source are presented. The present paper focuses on the hydrothermal flame combustion in a geometrically simple wall-cooled coaxial burner. Various kinds of hydrothermal flame experiments with methanol–water mixtures as fuel stream and pure oxygen as oxidizer were conducted at an operating pressure of 250 bar. Ignition was accomplished by heating-up the reactants to auto-ignition temperature (typical ignition temperatures 460–490 ° C). To investigate the flame stability, the injection temperature of the methanol–water mixture was lowered step-by-step to extinction. For methanol mass fractions higher than 11%, desired subcritical extinction temperatures are reached. The inlet temperature of the fuel stream can be lowered below 100 ° C with 27 wt.% methanol. The conversion ratios based on the analysis of the liquid effluent are generally above 99.95% for flame residence times in the order of magnitude of 100 ms.
80 citations
TL;DR: In this paper, the authors studied near blowoff dynamics and characteristics of turbulent premixed flames stabilized by a triangular flame holder in the midspan of a rectangular duct using high speed imaging and simultaneous particle imaging velocimetry and OH planar laser-induced fluorescence.
80 citations
TL;DR: In this paper, a large-eddy simulation of a turbulent hydrogen jet diffusion flame is presented, which handles fluctuations of density in space and in time, but assumes density to be independent of pressure (incompressibility).
Abstract: In this work a large-eddy simulation (LES) of a turbulent hydrogen jet diffusion flame is presented. The numerical method handles fluctuations of density in space and in time, but assumes density to be independent of pressure (incompressibility). The chemical composition of the fluid is described by solving the filtered transport equation for mixture fraction f. Density, viscosity and temperature are evaluated assuming chemical equilibrium. To account for sub-grid fluctuations of f, its sub-grid distribution is presumed to have the shape of a β-function. The results of the simulation are discussed extensively. The influence of inlet boundary conditions is addressed and radial profiles at different axial positions are shown for a complete set of one-point statistical data. Agreement of numerical results and experimental data is very good. Furthermore, a comparison of Reynolds- and Favre-averages is done and energy spectra at different locations in the flame are discussed.
80 citations
TL;DR: In this paper, the results of an extensive wind-tunnel study into the shapes and sizes of hydrocarbon jet diffusion flames in a horizontal cross-wind are presented, where the shape of a turbulent diffusion flame in a cross wind can be described by the frustum of a cone, which can be defined by five different parameters of shape.
80 citations
TL;DR: In this article, it has been shown that the high efficiency of the alkali oxalates is due to their ready decomposition in a flame, with the generation of submicron particles of alkali carbonate.
80 citations