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 article, the authors extend past analyses of liquid-oxygen-hydrogen flames at supercritical pressure by providing quantitative results that characterize multicomponent diffusion processes in the flame zone of a shear-coaxial injector element.
Abstract: This paper extends past analyses of liquid-oxygen-hydrogen flames at supercritical pressure by providing quantitative results that characterize multicomponent diffusion processes in the flame zone of a shear-coaxial injector element. High-fidelity simulations, using both the large-eddy-simulation and direct-numerical-simulation techniques, have been performed using detailed treatments of thermodynamic, transport and chemical kinetics. Results are presented for a condition where oxygen is injected in a cryogenic state, at a subcritical temperature and supercritical pressure, and hydrogen is injected in a supercritical state. This condition has significant technical relevance in liquid-rocket engines but is not well understood. For this situation a diffusion dominated mode of combustion occurs in the presence of exceedingly large thermophysical property gradients. The flame anchors itself in the interfacial region of high shear that exists between the liquid-oxygen core and the annular hydrogen jet...
175 citations
TL;DR: In this paper, a series of turbulent methane/air stratified flames stabilized on a swirl burner were investigated, and the corresponding three-dimensional surface density function and thermal scalar dissipation rate were investigated along with geometric characteristics of the flame such as curvature and flame thickness.
175 citations
TL;DR: In this article, weakly turbulent-lifted flame bases are simulated in the case of both gaseous and spray fuel jet injection and the properties of the zone where burning starts are found to strongly depend on the type of fuel injection.
175 citations
TL;DR: Barlow et al. as mentioned in this paper used multiscalar point measurements in the series of piloted CH{sub 4}/air jet flames to reveal the relative importance of molecular diffusion and turbulent transport in these flames.
175 citations
TL;DR: The causes of smoke emission from free gaseous laminar diffusion flanles are investi-gated in this article, where Soot concentration, temperature and velocity profiles were measured around the smokepoint for a range of fuels.
Abstract: The causes of smoke emission from free gaseous laminar diffusion flanles are investi-gated. Soot concentration, temperature and velocity profiles were measured around the smokepoint for a range of fuels. Smoke was emitted when the temperature in the burnout region droppedbelow about 1300 K.A smoking flame stopped emitting smoke when the temperature in the burnout region wasslightly raised locally by absorption of energy from a COz laser beam.The temperature drop in the flame is strongly coupled to soot concentration through radiationlosses. Soot formation rates are in turn influenced by heat losses and residence times near thefuel nozzle tip. Thus conditions near the nozzle influence the smoke point. The results are alsodiscussed in context with turbulent diffusion flame smoke emission.
175 citations