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 9 of 9 for “"unsteady combustion"”.
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The unsteady combustion of radiant heat flux-driven energetic solids
… investigation has been conducted on the unsteady combustion of energetic materials under dynamic radiant heating. Analysis has been carried out under the assumptions of quasi-steady gas and surface reaction, homogeneous propellant, and one-dimensional flame (QSHOD theory). Further, the …
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Determination of Flame Dynamics for Unsteady Combustion Systems using Tunable Diode Laser Absorption Spectroscopy
Lean, premixed combustion has enjoyed increased application due to the need to reduce pollutant emissions. Unfortunately, operating the flame at lean conditions increases susceptibility to thermoacoustic (TA) instability. Self-excited TA instabilities are a result of the coupling of the unsteady …
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Nonlinear Dynamic Combustion of Energetic Solids
… WSB model is used to model the nonlinear unsteady combustion of energetic solids. Additional validation of the model has been obtained by considering the new oxidizer HNF. Comparison of predictions for HNF combustion with a wide range of experimental observations including steady …
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Indirect noise in non-isentropic flows
… regime, which makes the combustor susceptible to unsteady combustion. Along with improper mixing and air cooling, the unsteady combustion process gives rise to flow inhomogeneities. The acceleration of these inhomogeneities in the nozzle downstream of the combustor generates indirect combustion …
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Combustion oscillations in a ducted burner
Unsteady combustion, confined within a duct, is a poorly understood and incompletely documented phenomenon. This is particularly true of the violent, low frequency combustion oscillation encountered in gas turbine reheat systems, commonly referred to as reheat buzz. This thesis describes an …
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Sound produced by entropic and compositional inhomogeneities
Combustion noise is central to several efforts to curb aircraft emissions. Indeed, acoustic waves originating in the combustor are a major contributor to aircraft noise. Moreover, they can act as a trigger for thermoacoustic instabilities, the consequences of which may range from decreased …
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Oscillatory Behavior of Fine AP/HTPB Composite Propellants
The steady and oscillatory combustion of wide distribution AP/HTPB composite propellants containing coarse AP and fuel-rich, fine-AP/HTPB pocket regions has been investigated experimentally and theoretically. These propellants are of special interest because they are similar to many wide …
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Analyses of flame response to acoustic forcing in a rocket combustor
High frequency combustion instabilities in liquid propellant rocket engines are spontaneously occurring pressure fluctuations that are coupled with unsteady combustion processes. Under the right conditions the unsteady fluctuations can grow to a point where they affect the operation of the …
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An Investigation of Controlled Oscillations in a Plasma Torch for Combustion Enhancement
… shock and resulting control of the supersonic combustion process. This research will capitalize on previous results [Gallimore, 1998] which indicate that the plasma torch oscillations originate from the inherent oscillations of the voltage applied to the torch. The aim of this research is to …