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A Study of Nonlinear Control for Power Generation SystemsLu, Zongtao 12 October 2010 (has links)
No description available.
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An investigation into the operating characteristics of a high radius pre-swirl cooling systemNew, Paul David January 2002 (has links)
No description available.
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Numerische Simulation des Fischdurchgangs durch WasserturbinenBöhm, Christian. January 2004 (has links) (PDF)
München, Techn. Universiẗat, Diss., 2004.
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Experimental Validation of a Hot Gas Turbine Particle Deposition FacilitySmith, Christopher Stephen 25 August 2010 (has links)
No description available.
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Predictions and Measurements of Film-Cooling on the Endwall of a First Stage VaneKnost, Daniel G. 15 October 2003 (has links)
In gas turbine development, the direction has been toward higher turbine inlet temperatures to increase the work output and thermal efficiency. This extreme environment can significantly impact component life. One means of preventing component burnout in the turbine is to effectively use film-cooling whereby coolant is extracted from the compressor and injected through component surfaces. One such surface is the endwall of the first stage nozzle guide vane.
This thesis details the design, prediction, and testing of two endwall film-cooling hole patterns provided by leading gas turbine engine companies. In addition a flush, two-dimensional slot was included to simulate leakage flow from the combustor-turbine interface.
The slot coolant was found to exit in a non-uniform manner leaving a large, uncooled ring around the vane. Film-cooling holes were effective at distributing coolant throughout much of the passage, but at low blowing rates were unable to provide any benefit to the critical vane-endwall junction both at the leading edge and along the pressure side. At high blowing ratios, the increased momentum of the jets induced separation at the leading edge and in the upstream portion of the passage along the pressure side, while the jets near the passage exit remained attached and penetrated completely to the vane surface.
Computational fluid dynamics (CFD) was successful at predicting coolant trajectory, but tended to under-predict thermal spreading and jet separation. Superposition was shown to be inaccurate, over-predicting effectiveness levels and thus component life, because the flow field was altered by the coolant injection. / Master of Science
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Fatigue of an aluminium coated single crystal nickel-base SuperalloyTotemeier, Terry Craig January 1994 (has links)
No description available.
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The analysis and design methods for turbomachinery flowsTsay, W. C. January 1989 (has links)
No description available.
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Formation and effects of intermetallics in the rhenium-containing nickel-base superalloy CMSX-4Proctor, Caroline Susan January 1994 (has links)
No description available.
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Boundary layers on compressor bladesDong, Yuan January 1988 (has links)
No description available.
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Soot formation in turbulent vaporised kerosine/air jet flames at elevated pressureYoung, K. J. January 1993 (has links)
The objective of this thesis is to develop and validate a model of soot formation which is capable of being applied to a computational fluid dynamic (CFD) simulation of gas turbine combustion. The work follows previous research by Moss and Co-workers (Moss et al.1987, Syed 1990, Stewart et al.1991) The concept of the study is to generate a detailed set of experimental data in turbulent flames of kerosine in which the complicating factors of gas turbine combustion - that is 3D geometry and droplet combustion - are removed. This allows more confidence in the computational simulation of the flames and therefore more insight into the soot formation process. There are two components to the work: the experimental and theoretical studies. The first involves the compilation of an experimental dataset of key variables in ethylene and vaporised kerosine jet flames at elevated pressure, the second with the simulation of two of the experimentally studied flames using CFD methods. The main achievement of the study is the generation of a formidable and detailed experimental database for flames at a variety of pressures and conditions. The unexpected finding is the extremely large conversion of carbon to soot found in the flames even at low pressure. This results in high radiant heat losses and measurement difficulties. From the data, it is possible to assess the pressure dependence of soot growth in kerosine flames. Although, at the higher pressures, high soot levels created uncertainties in the measurements, in absolute terms growth rate is shown to be independent of pressure up to 6atm pressure. Above this it increases significantly. The soot model of Moss et al.1988 - originally developed in laminar e~hylene flames - was shown to give excellent agreement in turbulent situations. However, owing to the large radiant heat loss and soot levels, its application to the kerosine flames was more problematic since the assumptions that soot is a perturbation to the gaseous field and that temperature may be accurately described by a single perturbed flamelet were no longer valid. Further models to deal with such situations are proposed and tested. Aside from the obvious relevance of this study to the field of gas turbine combustion, the large radiant heat loss and high soot levels observed in the flames studied here imply a further significance for the study of fire hazards. That a laboratory scale flame maybe made to behave in a similar manner to a much larger pool fire flame is a very useful finding.
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