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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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Journal ArticleDOI
TL;DR: In this paper, a coannular ethene diffusion flame was analyzed using cross sections for polydisperse aggregates and the fractal dimension of the aggregates in the flame was determined.

261 citations

Journal ArticleDOI
TL;DR: In this article, a study of the noise produced by turbulent premixed flames stabilized on open burners is described, and it is shown that such flames may be represented acoustically as a collection of monopole sound sources in the combustion zone.
Abstract: A study of the noise produced by turbulent premixed flames stabilized on open burners is described. It is shown that such flames may be represented acoustically as a collection of monopole sound sources in the combustion zone. The radiated sound pressure is dependent on the rate of change of the rate of increase of volume of the gas during combustion, which varies owing to the turbulence in the flow. The rate of volume increase is proportional to the rate of consumption of combustible gas mixture in the flame. To measure this quantity, an optical technique has been developed which relies on observations of changes in the intensity of emission from the free radicals C 2 or CH generated in the reaction zone. Good quantitative agreement is obtained between the radiated sound pressures calculated from these intensity measurements and the values recorded simultaneously with a microphone. A correlation observed between the mean emission intensities of C 2 and CH radicals and the total flow rate of combustible gas mixture both in the laminar and turbulent flames, and in their transition region, supports the wrinkled laminar flame concept of turbulent flame propagation.

261 citations

Journal ArticleDOI
TL;DR: In this article, the role of differential and preferential diffusion, thermal expansion, and heat losses in intrinsic combustion instabilities in both premixed and non-premixed systems is discussed.
Abstract: The focus of this article is on intrinsic combustion instabilities in both premixed and nonpremixed systems, identifying, in particular, the roles of differential and preferential diffusion, thermal expansion, and heat losses. For premixed flames, the hydrodynamic instability resulting from thermal expansion plays a central role and is particularly dominant in large-scale flames. It is responsible for the formation of sharp folds and creases in the flame front and for the wrinkling observed over the surface of expanding flames. In contrast, instabilities in diffusion flames, which give rise to cellular and oscillating flames, are mainly driven by diffusive-thermal effects, with thermal expansion playing a secondary role. The discussion also includes instabilities of edge-flames in unmixed reactants, which possess stability characteristics of both premixed and diffusion flames, but with a distinct mode of instability.

261 citations

Journal ArticleDOI
TL;DR: In this paper, a numerical method for simulation of turbulent diffusion flames in complex compressible flow fields is presented, which uses a two equation k -ϵ turbulence model combined with a stretched laminar flamelet model for turbulent diffusion flame as a mathematical description of the flame.

260 citations

Journal ArticleDOI
TL;DR: In this paper, two-dimensional reactive Navier-Stokes equations for an acetylene-air mixture are solved numerically to simulate the interaction of a shock wave and an expanding flame front, the formation of a flame brush, and deflagration-to-detonation transition.

259 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023183
2022331
2021194
2020133
2019141
2018157