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Showing 1 to 20 of 328 for “"Flames"”.
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Flames in Thin Channels
Finally, the flame front propagation in an adiabatic non-energetic channel is investigated. Specifically, the interaction of the flame front with the flow inside the channel is studied and the focus is to assess the thermal-expansion influence. It is found that thermal expansion enhances the …
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Flames in Straining Flows
In Chapt. 2, a model is proposed for flammability limits based on flame stretch that is applicable to upward propagation through lean methane/air mixtures in round tube. Predictions of the model are in good agreement with experiment.
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Soot burnout in flames
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1981.
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Ionisation in Flames with Additives
… pressure, of alkalimetal-seeded H2/02/N2 flames results in the formation of negative ions accompanied by a decrease in free electron concentrations. Observations were made of the effects of phosphorus on the ionisation of sodium, potassium, rubidium and caesium. The ionisation of lithium …
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Edge-Flames in Premixed Combustion
This work can have important applications in the context of premixed turbulent combustion modeling in the laminar flamelet regime.
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Studies on counterflow diffusion flames
Certain aspects of counterflow diffusion flames are addressed in the context of one-step Arrhenius-type global chemical reaction. The general Large-activation-energy asymptotic theory for diffusion flames is first revised and then applied to one dimensional counterflow diffusion flames with finite …
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Modelling of turbulent stratified flames
… for the simulation of stratified premixed flames is developed. Firstly, several sub-models for the dissipation rate of a reacting scalar are evaluated by the simulation of two laboratory scale flames, a turbulent stratified V-flame and a dump combustor fed by two streams of different …
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Thermally metastable fullerenes in flames
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1994.
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Dynamics of swirling jets and flames
… centered on the dynamics of swirling jets and flames. The first focuses on rigorously characterizing the behavior of laminar swirling jets and flames from a dynamical systems perspective using bifurcation analysis. These results offer several new insights into the physics of swirling jets, such …
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The blow-off of burner flames
… flow rates have been measured for inverted flames and for conical burner flames.
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Kinetic studies of ammonia-oxygen flames
<p>Since the early interest of Henry in burning ammonia with electric sparks, the literature of ammonia oxidation has been extensive. The major efforts have been industrially related and concern themselves with catalytic oxidation and its mechanism. The flame oxidation of ammonia has attracted more …
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The Formation of Smoke in Flames
… for studying the natural ionisation in flames is described, Results are presented for a simple oxygen / hydrogen flame to which two hydrocarbon fuels, ethylene and acetylene were added. The ethylene flame contained forty-two negative flame ion species, whereas the acetylene flame …
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Propagation of spherically expanding premixed flames
The propagation of spherically expanding premixed flames is investigated, in both confined and unconfined scenarios. In the unconfined case, the flame propagates at nearly isobaric conditions and the flame displacement speed eventually reaches a constant value whereas in the confined case there is …
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Simulation of partially premixed turbulent flames
… investigates the turbulent partially premixed flames, which are ubiquitous in combustion powered devices. This combustion mode involves many physical complexities such as flame propagation in unevenly premixed mixture of fuel and oxidiser, turbulence/flame interaction in presence of mixture …
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Ultra-fine soot investigation in flames
… used to investigate soot oxidation in fuel rich flames. Soot sampling techniques for polycyclic aromatic hydrocarbon (PAH) analysis were also developed and used to obtain P AH information on soot generated from methane/oxygen premixed flames. The SMPS analysis was performed for SMPS inlet …
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Soot formation in laminar diffusion flames
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1958
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On the structure of laminar diffusion flames
The structure of laminar diffusion flames is analyzed in the limiting case of large, although finite, reaction rates. It is shown that the chemical reaction takes place only in a very thin region or "chemical boundary layer" where convection effects may be neglected. Then the temperature and mass …
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A fractal analysis of premixed turbulent flames
… behavior of lean premixed wrinkled turbulent flames was investigated over a range of turbulence conditions. For this purpose a turbulent combustion rig was designed and built in which the turbulence intensity and scale could be independently varied by means of a set of grids. The relative …
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