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 210 for “"Swirl"”.
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Simulations of turbulent swirl combustors
This 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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Flame-flow interaction during premixed and stratified swirl flame flashback in an annular swirl combustor
… the understanding of boundary layer flashback of swirling flames. In this work, I investigated this interaction during flashback using high-speed luminosity imaging and simultaneous three-dimensional particle image velocimetry. The mean axial velocity through the mixing tube is kept at 2.5 m/s …
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Swirl flow in dispersed flow film boiling,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969.
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The Autumn Leaves Swirl in Crisp October Wind
The Autumn Leaves Swirl in Crisp October Wind is a programmatic work for wind ensemble consisting of five sections. Each section of the work takes the listener on a journey through my own childhood memories of autumn in Michigan. The first section is titled “Bursting with Color”, featuring the …
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Controller Design for a Swirl Injection Hybrid Launch Vehicle
… from the new development of rocket engines which swirl combustion gases to gain combustion stability benefits, and in the case of hybrid rocket engines, fuel regression benefits as well. The stability of the launch vehicle dynamics due to the internal torque has not been discussed before. To the …
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The Evaluation of Time-Dependent Flow in Swirl Burners
Swirl burners are widely used in industry. Recent environmental concerns, particularly on emissions from combustion processes, have introduced the requirement to modify these processes to reduce emissions whilst at the same time maintaining combustion efficiency. This thesis presents details of …
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The use of swirl to clean nuclear rocket plumes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Simulating Extinction and Blow-off in Kerosene Swirl Spray Flames
… and spray flames in a lab-scale bluff body swirl spray flame configuration. The jet fuels simulated are the Dagaut Jet-A1 surrogate and the U.S. National Jet Fuels Combustion Program (NJFCP) fuels of interest: A2, C1, and C5. A2 is a conventional Jet-A used as a reference fuel, whereas C1 …
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Experimental Investigation of Fan Rotor Response to Inlet Swirl Distortion
… secondary flow, commonly referred to as swirl. As a means to investigate the interactions of swirl distortion with turbofan engines, an experiment was designed to measure distorted flow profiles in an operating turbofan research engine. Three-dimensional flow properties were measured at …
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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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Fluid Dynamics of Inlet Swirl Distortions for Turbofan Engine Research
… such as total pressure, total temperature, and swirl distortions. Swirl distortions are angular non-uniformities in the flow that may alter the functioning of specific components of the turbomachinery systems. To investigate the physics involved in the ingestion of swirl, pre-determined swirl …
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Boundary Layer Development in Laminar Swirl Flow Inside a Circular Pipe.
… within the developing boundary layer of a swirling flow of an incompressible fluid in a circular pipe are investigated in this study. It is assumed that the intake conditions are such that the fluid, moving in the direction of the axis of the pipe, enters the pipe with an axial component …
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An inverted pressurized water reactor design with twisted-tape swirl promoters
… to improve the core DNB performance by using swirl flow promoters. This thesis further takes advantage of the new core geometry to increase the core power density by using twisted tapes (TTs) as swirl flow promoters inside the IPWR cooling channels. The study focuses on optimizing the cooling …
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Flame Structure and Emissions of Strongly-Pulsed Turbulent Diffusion Flames with Swirl
… non-premixed flames with co-flow swirl. The fuel injection is controlled by strongly-pulsing the fuel flow by a fast-response solenoid valve such that the fuel flow is completely shut off between pulses. This control strategy allows the fuel injection to be controlled over a wide …
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Theoretical And Experimental Investigation Of The Cascading Nature Of Pressure-Swirl Atomization
Pressure swirl atomizers are commonly used in IC, aero-engines, and liquid propellant rocket combustion. Understanding the atomization process is important in order to enhance vaporization, mitigate soot formation, design of combustion chambers, and improve overall combustion efficiency. This work …
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Pyrolysis oil combustion characteristics and exhaust emissions in a swirl-stabilized flame
<p>An optically accessible domestic-scale swirl-stabilized combustor has been developed to allow for the investigation of combustion characteristics of biomass derived pyrolysis oils in pressure-atomized and air-atomized spray flames. Pine and corn fiber derived pyrolysis oil have been studied, …
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Analyses of Bluff Body and Swirl-Stabilised Flames Using Large Eddy Simulation
… through the use of bluff body flame holders and swirling flow. However, these flames are prone to unstable phenomena that may hinder successful ignition or lead to the occurrence of flashback and other instabilities that may lead to flame blow-off. The stabilisation mechanisms of highly unstable …
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The effect of inlet swirl on knock limits in spark ignition engines
… was undertaken to determine the effect of swirl ratio on knock limits in spark ignition engines. Initially it was attempted to find a correlation between swirl ratio and Knock Limited Spark Advance (KLSA) for a selection of commercially available engines. A comparison of measured swirl …
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Suppression of thermoacoustic instabilities in a swirl combustor through microjet air injection
… of combustion instability in the context of a swirl-stabilized, lean-premixed combustor: the role of the major coherent flow structures, and the potential for using secondary air injection to passively suppress combustion instability. Microjets inject air into the combustion chamber in the …
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