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.
Results
Showing 1 to 20 of 39 for “"Turbine performance"”.
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The Effect of Heat Transfer on Turbine Performance
… of the combustor being cooled in most large gas turbines, the effect this cooling has on their performance is still unclear. Fundamental questions, such as how turbine efficiency should be defined and which flow features reduce performance, remain unanswered. This thesis answers these questions …
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An experimental study of improvement of a micro hydro turbine performance
… includes a literature survey of small hydraulic turbines, incorporating a historical review. The possible role of "micro hydros" in generating power in various parts of the world, and particularly in Iran, is discussed. The theory of turbo machinery, particularly with regard to axial flow …
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The impact of evaporatively cooled turbine blades on gas turbine performance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Gaussian process models for SCADA data based wind turbine performance/condition monitoring
… growth in the past decade, and installed wind turbine capacity is increasing significantly every year around the globe. The presence of an excellent offshore wind resource and the need to reduce carbon emissions from electricity generation are driving policy to increase offshore wind generation …
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CFD study of diffuser geometry effects on diffuser augmented wind turbine performance
This thesis aims to explore the performance limits of diffuser augmented wind turbines. Many studies of this topic have been performed in the past. Limiting assumptions and manufacturing concerns have forced the majority of previous studies to stray away from finding optimal performance in favor of …
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Influence of Reynolds number and blade geometry on low pressure turbine performance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Aerodynamic Performance of High Turning Airfoils and the Effect of Endwall Contouring on Turbine Performance
Gas turbine companies are always focused on reducing capital costs and increasing overall efficiency. There are numerous advantages in reducing the number of airfoils per stage in the turbine section. While increased airfoil loading offers great advantages like low cost and weight, they also result …
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The applicability of aerodynamic models to tidal turbines.
… to progress, simple models for predicting the performance of tidal current turbines are needed. Currently the aerodynamic models developed for wind turbines are typically used to predict tidal turbine performance. There are a number of significant differences between wind and tidal turbines so …
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Scaling Effects on the Hydrodynamics and Performance of Current Turbines
The performance of a current turbine is influenced by numerous variables related to the geometry of the turbine and channel, the fluid properties, and the external forces acting on the system. These variables can be non-dimensionalized to form parameters that affect the dimensionless performance of …
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Real gas effects in ORC turbines
… study the effects of varying gas properties 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 …
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Determining appropriate loss coefficients for use in the nozzle-model of a stage-by-stage turbine model
A previously developed turbine modelling methodology, requiring minimal blade passage information, produced a customizable turbine stage component. This stage-by-stage turbine nozzlemodel component was derived from the synthesis of classical turbine theory and classical nozzle theory enabling the …
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Quantifying the relationship between wind turbine component failure rates and wind speed
Onshore wind turbine technology has matured to the point when assets are now expected to produce availabilities greater than 97%. The wind speed a wind turbine operates in has an impact on its reliability. Hitherto this relationship has not been defined, quantified or used to undertake analysis to …
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Characterization of Cooled Turbine Efficiency for Off-Design Performance Models
<p>Gas turbine performance modeling is essential for predicting engine behavior across design and off-design conditions. Yet the treatment of cooling or service flows remains inconsistent, as these streams interact with the main flow in complex ways and their contribution to turbine work depends on …
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SIMULATION AND OPTIMIZATION OF COMBINED CYCLE GAS TURBINE POWER PLANTS
Combined cycle gas turbine (CCGT) power plants normally run under off-design (namely part-load) conditions during their lifetime. Off-design operation decreases plant thermal efficiency and increases carbon emissions. Hence, there are strong incentives to study and improve CCGT performance under …
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Wind power applications to groundwater remediation
… reduced greenhouse gas emissions. Small wind turbine systems marketed for single residence applications may be the appropriate size for remediation systems, and such wind turbines are readily available at reasonable cost. Another benefit of using domestic wind turbine systems is that they are …
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Effects of blade configuration on flow distribution and power output of a zephyr vertical axis wind turbine.
… using both horizontal and vertical axis wind turbines. This thesis presents studies of a vertical axis wind turbine performance for applications in urban areas. Numerical simulations with FLUENT software are presented to predict the fluid flow through a novel Zephyr vertical axis wind …
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Type-C wind turbine model order reduction and parameter identification
… it useful to have models to investigate wind turbine performance. For different applications, an accurate modeling of aerodynamics, power electronics, electrical transients, or control systems are necessary. In other scenarios, these models may be unavailable or needlessly complex. Through use …
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Experimental Investigations into the Fluid Dynamics and Forcing Underlying Cross-flow Turbine Operation
… sectors, axial-flow (i.e., horizontal axis) turbines are a well-established and well-understood approach to converting the kinetic energy in a moving fluid to electricity. Recent cross-flow (i.e., vertical axis) turbine research has yielded substantial performance gains through the …
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A strategy for modeling hydroelectric plants and improving their performance
… techniques and improving hydroelectric plant performance is presented. The plan begins with defining and establishing basic plant modeling parameters from the physical plant description. Guidelines for forming linear or nonlinear mathematical models are developed and the plan culminates in the …
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