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 133 for “"Combustors"”.
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Transient Phenomena in Annular Combustors
… related to the operation of annular gas turbine combustors, namely ignition and blow-off. The experiments were conducted on complex multi-burner geometries, close to realistic combustors, to provide a wide data set including stability limits, flame regimes and physical mechanisms of ignition and …
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Simulations of turbulent swirl combustors
… thesis aims at improving our knowledge on swirl combustors. The work presented here is based on Large Eddy Simulations (LES) coupled to an advanced combustion model: the Conditional Moment Closure (CMC). Numerical predictions have been systematically compared and validated with detailed …
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Blow-off in gas turbine combustors
This thesis describes an experimental investigation of the flame structure close to the extinction and the blow-off events of non-premixed and spray flames stabilized on an axisymmetric bluff body in a confined swirl configuration. The comparison of flames of different canonical types in the same …
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Dynamics of Lean Direct Injection Combustors
Improvements to heritage gas turbine engines will be needed in the coming years as the demand made on these systems increase. While industry continually presses for higher performance of both military and civilian aero engines, the government simultaneously raises the bar for emissions standards in …
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Fuel-flexible Gas Turbine Combustors for Decarbonization
L'abstract è presente nell'allegato / the abstract is in the attachment
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Primary zone modeling for gas turbine combustors
… addition at conditions typical of gas turbine combustors, (ii) to assess the relative merits of various reduced-order models, and (iii) to define the applicability of these models in the design process. To this end, several reduced-order models of combustor primary zones were developed and …
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Probabilistic aerothermal design of gas turbine combustors
… estimated using deterministic methods for these combustors, and the probability that a randomly selected combustor will fail earlier than predicted using deterministic methods is approximately 80 percent. Finally, the application of a sensitivity analysis to a surrogate model for the life …
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Turbulent combustion simulation in realistic gas-turbine combustors
The work presented in this thesis addresses issues involving the accurate and efficient numerical modelling of turbulence combustion with an emphasis on an industrially representative Tay model combustor. This combustor retained all essential features of a modern aero-engine rich burn combustor and …
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An Experimental Study of Transient Flows in Pulse Combustors
<p>The purpose of this investigation was to experimentally characterize a pulse combustor with respect to ambient conditions, pressure amplitudes, wall temperature, combustor geometry and type of centerbody used. The wall temperatures were recorded and the pressure variation was obtained using a …
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Numerical investigation of the instability of premixed dump combustors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.
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One-Dimensional, Finite-Rate Model for Gas-Turbine Combustors
… been developed for the analysis for gas-turbine combustors. The basis of the model is the one-dimensional, integral form of the conservation equations for multi-species, non-equilibrium, reacting mixtures. Special procedures were devised for the flow-division of the inlet flow into primary- and …
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Acoustic performance of bias flow liners in gas turbine combustors
Der Einsatz moderner Verbrennungskonzepte zur Effizienzsteigerung und Schadstoffreduktion bei Gasturbinen wird oft durch thermo-akustische Instabilitäten verhindert. Durchströmte Brennkammerliner können die akustische Dämpfung des Systems erhöhen und die Instabilitäten unterdrücken. Eine …
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Characterization of compact gas turbine combustors for alternative fuel integration
The student, Eric Wood, submitted this Dissertation for approval on 2023-07-06 at 09:50.
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Computational Fluid Dynamics Investigation of Oscillatory Behaviour in Annular Combustors
… on predicting this behaviour in annular combustors. The complexity of the annular design can give rise to an additional set of intricate oscillations due to the presence of interactions between neighbouring flames. The project is concerned with capturing trends in oscillatory behaviour in …
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A physics-based emissions model for aircraft gas turbine combustors
… and CO emissions from five different industry combustors to certification data. The model developed in this work correctly captures the physical relationships between engine operating conditions, combustor design parameters, and NO. and CO emissions. The NO. estimates are as good as, or better …
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Experimental Studies of Injector Array Configurations for Circular Scramjet Combustors
A flush-wall injector model and a strut injector model representative of state of the art scramjet engine combustion chambers were experimentally studied in a cold-flow (non-combusting) environment to determine their fuel-air mixing behavior under different operating conditions. The experiments …
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Effect of inlet configurations on the aerodynamics of swirl combustors
The flowfield in a swirling combustor with a Confinement Ratio of 1.6 was simulated in water. Qualitative measurements were made from flow visualization in a horizontal water rig with the help of Pliolite beads and liquid dye. Velocity and turbulence measurements were made in a cold air flow rig. …
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Fuel Droplet Optical Diagnostic Techniques for Lean Premixed Prevaporized Aeroengine Combustors
… the performance and limitations of these combustors. Thus, a key focus is the analysis of fuel droplets in these combustors across various CST relevant operating conditions. This work employs a combination of optical diagnostics to enhance the understanding of fuel spray dynamics. Here, …
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Hydrodynamic scaling and solids mixing in pressurized bubbling fluidized bed combustors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Fluidic Jet Turbulence Generators for Deflagration to Detonation Transition in Pulsed Detonation Combustors
<p>The goal of this study is to establish the dominant flow structure required to effectively accelerate the turbulent deflagration flame front to detonation velocity in the shortest possible distance while using a single Jet in Cross Flow (JICF). Jets in crossflow, depending on orientation and …
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