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Showing 1 to 20 of 68 for “"Flame propagation"”.
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Mechanisms of turbulent flame propagation
… ratio there is evidence of a wrinkled laminar flame structure, but at lower values a small scale eddy structure seems to be dominant. A two eddy theory of turbulent combustion is presented. This rests-upon the assumption, supported by a good deal of experimental evidence, that two scales of …
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A photographic study of flame propagation
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1932.
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A study of turbulent flame propagation
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1982
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The bending effect in turbulent flame propagation
In the present thesis, the sensitivity of flame propagation to the turbulent motion of burning gases is investigated. The long-standing issue of the 'bending effect' is focused upon, which refers to the experimentally-observed inhibition of flame propagation velocity at high intensities of …
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Laminar flame propagation in a stratified charge
The propagation of laminar flame from a rich or stoichiometric mixture to a lean mixture in a stratified methane-air charge was investigated experimentally and numerically. Emphasis was on the understanding of the flame behavior in the transition region; in particular, on the mechanism of burning …
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Effect of Gravity on Lean Limit Flame Propagation
Made available in DSpace on 2014-12-14T04:42:05Z (GMT). No. of bitstreams: 1 8009141.pdf: 10548535 bytes, checksum: ab2bfa298bd0dabf1c41b14371af59aa (MD5) Previous issue date: 1979
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Modelling spherical flame propagation in a closed volume
… behaviour of alternative fuels. The laminar flame speed of a combustible mixture is a well defined combustion characteristic that influences the efficiency and performance of many combustion processes. An example of where flame speed has a strong impact on the performance of a combustion …
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Turbulent flame propagation characteristics of high hydrogen content fuels
… to better understand the physics of turbulent flame propagation in highly stretch sensitive premixed flames in order to predict their behavior at conditions realistic to the environment of gas turbine combustors. This thesis presents the results of an experimental study into the flame …
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Experimental investigation of flame propagation in long, narrow tubes
Combustion of premixed propane-air flames propagating in horizontal quartz tubes of small diameter (6.4 mm) was studied using high-speed photography and Particle Streak Velocimetry (PSV). Several regions of propagation were established, including an initial region of uniform propagation, a …
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The Role of Fuel Droplets in Laminar Flame Propagation
… explores the role of fuel droplets in laminar flame propagation. In particular, the effect of fuel droplets on the burning velocity of strained laminar premixed flames was investigated via experimentation and simulation. The twin premixed counterflow configuration was used to measure reference …
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The photographic study of the phenomena following flame propagation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1929.
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Measurement of flame propagation through step changes in mixture composition
Flame speed is a central metric in the field of combustion. While particular mixtures have characteristic flame speeds, it has also been shown that in compositionally stratified mixtures, flames exhibit a path dependency, or memory effect. The goal of the experimental work presented in this thesis …
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Fundamental studies of flame propagation in lean-burn natural gas engines
… characteristic time required for steady premixed flame propagation has three components: time for autoignition to occur, time for peak temperature to be achieved following autoignition, and time for steady flame propagation in the premixed fuel/air mixture to be achieved. The autoignition time …
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Laminar flame propagation in mixtures with compositional stratification at small length scales
The behavior and structure of laminar hydrocarbon flames which propagate parallel to the direction of a periodic gradient of mixture composition was studied both experimentally, using a specially designed burner, and computationally, using a planar numerical model. The variations in local mixture …
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Experimental and Theoretical Investigation of Flame Propagation Through Compositionally Stratified Methane -Air Mixtures
"Flame propagation in compositionally stratified methane-air mixtures was studied experimentally and theoretically. Stratification was established in a controlled manner using a convective-diffusive balance with very slow fuel-air mixture inflows into an optically accessible test chamber and its …
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Flame propagation model for the CFR engine under knocking and non-knocking conditions
… and is often equated to the turbulent flame speed of the fuel. The objective of this project is to develop a combustion model using the turbulent flame propagation concept that can be used to study the influence of the underlying flame speed behaviour during combustion. The model was …
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Flame propagation through different sizes of metal mesh and mitigation using fine water sprays
… on the mitigation of slow-moving deflagrationsflames flow through various mesh sizes and water spray, with resulting speeds of ≤30m/s.Thus, the mesh sizes thickness and droplets within the spray must be small enough to extractheat in the short finite moments that the flame, mesh and droplets …
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Laser shadowgraph study of early flame propagation in swirling flows near the lean misfire limit.
… locations on the specific rate of growth of flame area, the flame speed and the convection velocity are investigated experimentally in a constant volume vessel near the lean misfire limit for an equivalence ratio of 0.645 using the shadowgraph technique. The circular and the elliptical models …
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Combustion of aerosolized spherical aluminum powders and flakes in air
… that the rates of pressure rise and rates of flame propagation were higher for aluminum powders with BET diameters of about 2 to 5 um compared to aluminum flakes for which the BET diameters were under 1 um In agreement with the flame propagation rates, the overall completeness of combustion …
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Assessment of the factors influencing PN emission in a DISI engine under cold-start condition
… non-fuel originated sources (e.g., lubricant), flame propagation in rich mixture and the pyrolysis of the vapor from liquid fuel film. Through a series of experiments, it has been found that non-fuel contribution is less important than the other two mechanisms. For all operating conditions, the …
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