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 758 for “"Turbines"”.
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Maintenance optimisation for wind turbines.
… common maintenance strategies applied to wind turbines are inadequate to support the current commercial drivers of the wind industry. Consequently, a hybrid approach to the selection of a suitable maintenance strategy is developed. The approach is used in a case study to demonstrate its …
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The siting of wind turbines
… Previous work done on the siting of wind turbines using physical modeling was investigated prior to proceeding with the construction of and experimentation with a scale model. The utilization of two modeling techniques enabled the direct comparison of results.
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Condition Monitoring Techniques for Wind Turbines
… on practical condition monitoring of wind turbines. With offshore wind playing an increasing part in UK electricity generation, prompt fault detection leading to preventative maintenance is gaining in importance. This work describes the development of a condition monitoring test rig and the …
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Real gas effects in ORC turbines
… on turbine performance. Most prominently ORC turbines are operating with a multitude of different working fluids that have very strong variations in gas properties. Moreover, this also applies to conventional steam turbines or first stage HP turbines with very high temperatures, where the gas …
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Dynamic clearance modelling of steam turbines
… of high-pressure and intermediate-pressure turbines from Eskom's current turbine fleet. The study saw the utilisation of the Nozzle Analogy theory to develop a 1D multistage turbine thermofluid model as well as the development of a representative 1D turbine process model in order to predict …
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Advanced controls for floating wind turbines
Floating Offshore Wind Turbines (FOWT) is a technology that stands to spearhead the rapid growth of the offshore wind energy sector and allow the exploration of vast high quality wind resources over coastal and offshore areas with intermediate and large water depths. This generates the need for a …
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Flexible dynamics of floating wind turbines
… for a coupled analysis of offshore floating wind turbines consisting of a tower, a floating platform and a mooring system. In this multi-body, linear frequency-domain model, the tower is represented as a series of uniform Timoshenko beams connected to each other. The deflections of the tower are …
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Parametric design of floating wind turbines
… that cost effective designs for floating wind turbines are needed. The next frontier for wind power is the ocean, yet development in near shore waters has been slowed by aesthetic concerns of coastal residents. Going further offshore eliminates these aesthetic concerns and has the additional …
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Wave loads on offshore wind turbines
… of alternative energy and offshore floating wind turbines are considered viable and economical means of harnessing ocean energy. The accurate prediction of nonlinear hydrodynamic wave loads and the resulting nonlinear motion and tether tension is of crucial importance in the design of floating …
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Air jet vortex generators for wind turbines
Air jet vortex generators are a boundary layer control device and as such can effect a significant delay to the stall of an aerofoil. They can also reattach a separated flow, as long as the angle of attack is less than the air jets 'on' stall angle. A wind tunnel model was built and tested and then …
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Three-Dimensional Unsteady Hydrodynamics of Tidal Turbines
… the presence of waves and ocean turbulence. The turbines sustain damage due to the fluctuating loads that result from the unsteady flow, either from high-cycle fatigue or from extreme loading events exceeding the ultimate tensile strength of components. In this thesis, the problem of unsteady …
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Frequency-domain modelling of floating wind turbines
… motion may be relatively small for floating wind turbines, compared to other floating offshore structures. The aerodynamic loads are linearised using both harmonic and tangent linearisation approaches; the harmonic linearisation gives improved results when stall occurs. The wake dynamics can also …
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Unsteady flow inefficiencies in partial-admission turbines
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1961
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Modeling, simulation, and control of gas turbines.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1972. M.S.
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Simulation of Isothermal Combustion in Gas Turbines
Current improvements in gas turbine engine performance have arisen primarily due to increases in turbine inlet temperature and compressor pressure ratios. However, a maximum possible turbine inlet temperature exits in the form of the adiabatic combustion temperature of the fuel. In addition, …
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Below-Rated Control of Swept-Blade Wind Turbines
… studies have shown that 1.5 and 3.0 MW wind turbines with blade sweep have an increased annual energy production (AEP) of approximately 5% when compared to straight-blade wind turbines. The objective of the research was to further increase below-rated, variable speed, power capture when using …
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