Topic
Luminous flame
About: Luminous flame is a research topic. Over the lifetime, 340 publications have been published within this topic receiving 5480 citations.
Papers published on a yearly basis
Papers
More filters
257 citations
TL;DR: In this article, the authors used the Burke and Schumann flame sheet concept to locate the stoichiometric fuel-oxygen interface and, hence, the points of heat release in a laminar methane-air diffusion flame.
251 citations
TL;DR: In this article, two different categories of sooting flame structures can be classified depending on the relative transport of soot particles to flames, i.e., the soot formation-oxidation flame (SFOF) and the SOOT formation flame (SSFL).
161 citations
TL;DR: In this article, the behavior of a natural convection plume above a line fire is studied both theoretically and experimentally, and a quadrature solution has been obtained for each of two separate ranges of a source Froude number, F 1.
Abstract: The behaviour of a natural convection plume above a line fire is studied both theoretically and experimentally. In the theoretical treatment, a turbulent plume above a steady two-dimensional finite source of heated fluid in a uniform ambient fluid is investigated. By the use of the lateral entrainment assumption, a quadrature solution has been obtained for each of two separate ranges of a source Froude number, F 1. In neither of these cases can the finite width line source be accurately represented by an equivalent mathematical line source at a lower level. Only the special case, F = 1, can be so represented and its solution is discussed.In the experimental treatment, hot gases, resulting from the burning of a liquid fuel in a long channel burner, are driven upwards by buoyancy and gradually cooled down by the entrainment of ambient air. The average temperature along lines parallel to the channel burner was measured by a piece of resistance wire. For the case of a non-luminous diffusion flame, the effective radiation loss to the surroundings was assumed to be negligible, and,by a comparison of the energy flux supplied from the fuel and the energy flux contained in the plume, the characteristic turbulence entrainment coefficient is determined. By the alternate use of either an absorbing or a reflecting surface for the table-top surrounding a luminous flame, a measurement was made of the energy radiated from the flame that was intercepted by the fire surroundings and subsequently returned to the buoyancy plume by heating the ingested air. These measurements agree with estimates computed from such data as are available. The experimental results relating to the behaviour of the convection plume agree closely with the theoretical predictions in all cases.
151 citations
01 Jan 1989
TL;DR: In this paper, two distinct vortices were visualized in the flames studies: large toroidal vortice outside the luminous flame and small roll-up vorticles inside the luminescent flame.
Abstract: Planar visualization was employed to study flame structure and low frequency flame oscillation. Two distinct vortices were visualized in the flames studies: large toroidal vortices outside the luminous flame and small roll-up vortices inside the luminous flame. The flame oscillation frequency and the convective velocity of the toroidal vortices were measured for ethylene, methane, and propane diffusion flames over a wide range of test conditions. The frequency was typically in the range 10 to 20 Hz and the convective velocity was approximately, 0.8 m/s. The frequency of the toroidal vortices was found to correlate with the flame oscillation frequency. The potential effects of the toroidal vortices on the flame dynamics at low fuel flow rates are discussed, for example, low frequency flame oscillation, non-linear flame bulge motion, and quenching of the luminous flame surface.
144 citations