Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"Flame speed"”.
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Relation between flame speed and stretch for a premixed flame in a stagnation point flow
The student, Midhun Joy, submitted this Thesis for approval on 2017-12-11 at 14:52.
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Autoignition and flame speed of premixed liquefied petroleum gas in a rapid compression machine: experimental results and reduced chemical kinetic mechanism
… gas recirculation (EGR) on the autoignition and flame speeds of LPG/oxidizer/inert/EGR blends. Experiments were conducted with 100% propane and blends of propane with propene, ethane, isobutane, or n-butane. EGR was simulated with mixtures of Ar, CO2, CO, and NO at substitution percentages from 0 …
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Effects of exhaust gas recirculation on exhaust nitric oxide concentrations, cycle-to-cycle variations, and flame speed in an S.I. engine.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1973
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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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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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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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Reactions of aluminum with halogen containing oxides
… nanoparticle fuel and oxidizer can exhibit high flame propagation speeds on the order of 1000m/s when burning in an unconfined environment. In particular, halogen based formulations such as aluminum and iodine pentoxide have received significant attention due to both high flame speeds and …
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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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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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Propagation of premixed flames in confined channels
The propagation of premixed flames in confined channels is investigated. In the unconfined case, the structure of the flame and the flame speed for the adiabatic planar flame have been numerically obtained and confirmed with the existing theory. It is seen that in the unconfined case, the flame …
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Research on late-robust combustion
… carried out in which charge motion or laminar flame speed was varied. Two sets of tests were done. The first consisted of using an air jet mounted in the intake port to generate charge motion at a spark-timing sweep from 20⁰ BTC to 200 ATC. Two jet orientations were tested with the intent of …
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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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Solution of strained edge flames by a boundary value method
Edge flames are fundamental flame structures essential to the description of flame hole dynamics in turbulent combustion and the stabilization of lifted jet flames. In this thesis we concentrate on the role of boundary conditions and how they, in turn, can induce an undesirable streamwise pressure …
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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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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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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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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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