Now showing items 1-10 of 12
Acoustic Characterization of Flame Blowout Phenomenon
(Georgia Institute of Technology, 2006-02-10)
Combustor blowout is a very serious concern in modern land-based and aircraft engine combustors. The ability to sense blowout precursors can provide significant payoffs in engine reliability and life. The objective of this ...
Acoustic radiation from premixed flames disturbed by turbulent velocity fluctuations
(Georgia Institute of Technology, 2004-06-07)
Large Eddy Simulation of a High Aspect Ratio Combustor
(Georgia Institute of Technology, 2006-11-20)
The present research investigates the details of mixture preparation and combustion in a two-stroke, small-scale research engine with a numerical methodology based on large eddy simulation (LES) technique. A major motivation ...
Dynamics of longitudinally forced bluff body flames with varying dilatation ratios
(Georgia Institute of Technology, 2009-11-09)
This thesis focuses on experimentally measuring the response of varying dilatation ratio bluff body flames under harmonic excitation. Such flames are often encountered in jet engine afterburners and are susceptible to ...
Dynamics of perturbed exothermic bluff-body flow-fields
(Georgia Institute of Technology, 2008-07-08)
This thesis describes research on acoustically excited bluff body flow-fields, motivated by the problem of combustion instabilities in devices utilizing these types of flame-holders. Vortices/convective-structures play a ...
Numerical Simulation of Flame-Vortex Interactions in Natural and Synthetic Gas Mixtures
(Georgia Institute of Technology, 2004-08-17)
The interactions between laminar premixed flames and counter-rotating vortex pairs in natural and synthetic gas mixtures have been computationally investigated through the use of Direct Numerical Simulations and parallel ...
High Frequency Acoustic Wave Scattering From Turbulent Premixed Flames
(Georgia Institute of Technology, 2008-01-10)
This thesis describes an experimental investigation of high frequency acoustic wave scattering from turbulent premixed flames. The objective of this work was to characterize the scattered incoherent acoustic field and ...
Experimental and numerical investigation of laminar flame speeds of H₂/CO/CO₂/N₂ mixtures
(Georgia Institute of Technology, 2008-03-12)
Coal derived synthetic gas (syngas) fuel is a promising solution for today s increasing demand for clean and reliable power. Syngas fuels are primarily mixtures of H2 and CO, often with large amounts of diluents such as ...
Modeling the Response of Premixed Flames to Flow Disturbances
(Georgia Institute of Technology, 2007-09-27)
Modeling the Response of Premixed Flames to Flow Disturbances Preetham 178 pages Directed by Dr. Tim Lieuwen Low emissions combustion systems for land based gas turbines rely on a premixed or partially premixed ...
Characteristics of Sound Radiation from Turbulent Premixed Flames
(Georgia Institute of Technology, 2007-11-08)
Turbulent combustion processes are inherently unsteady and, thus, a source of acoustic radiation, which occurs due to the unsteady expansion of reacting gases. While prior studies have extensively characterized the total ...