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 79 for “"horizontal axis"”.
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Adaptive Composite Blades for Horizontal Axis Tidal Turbines
… the area of kinetic energy devices, most likely horizontal axis tidal turbines (HATTs). No HATT technology is yet commercial and further research into the field is required to advance the concepts, improve the feasibility of maintenance and make devices more efficient and economic.<br/>The blades …
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Experimental and theoretical study of horizontal-axis wind turbines
An experimental and theoretical study of horizontal-axis wind turbines is undertaken. The theoretical analyses cover the four major areas of aerodynamics, turbulence. aeroelasticity and blade optimisation. EXisting aerodynamic theories based on blade-element theory for predicting the loads on a …
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Analytical Unsteady Aerodynamic Models for Horizontal Axis Wind Turbines
This thesis describes the development of unsteady aerodynamic models of wind turbines within the framework of blade element momentum theory. The main purpose is to build analytical models, and test them against available wind tunnel and field test data. The unsteady wake is modeled using vortex …
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Performance measurement of a ten kilowatt horizontal axis wind turbine
A system to measure the performance of a 10 kN horizontal axis wind turbine was designed and was employed to test an Electro WVG-120G wind generator. Parameters measured were wind speed, voltage, current, and frequency. Output power and tip speed ratio were calculated from the measured parameters. …
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Numerical Analysis of an Axial Flow Horizontal Axis Marine Hydrokinetic Turbine
… in the wake of a counter-rotating dual rotor horizontal axis tidal turbine is studied by numerically solving the Reynolds Averaged Navier Stokes (RANS) Equations. The rotational effects of the turbine are modeled using the sliding mesh technique. The realizable k-epsilon model is employed to …
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Numerical and experimental investigation of flow in horizontal axis Pelton turbines
… understanding of the flow features within a horizontal axis Pelton turbine casing and the effects the geometry has on this flow and subsequently turbine performance. The CFD analysis was carried out using the commercial code ANSYS® FLUENT® and included a number of numerical and physical …
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Aerodynamic design and analysis of small horizontal axis wind turbine blades
The exploitation of small horizontal axis wind turbines provides a clean, prospective and viable option for energy supply. Although great progress has been achieved in the wind energy sector, there is still potential space to reduce the cost and improve the performance of small wind turbines. An …
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The design and testing of a horizontal axis wind turbine with sailfoil blades
… covers the design, development and testing of a horizontal axis wind turbine (HAWT) with Sailfoil blades.<br></br><br></br> Included is a brief history of wind turbine technology, its revival, a review of current wind energy developments and a literature survey of previous work on wind turbines …
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Structural Analyses of Wind Turbine Tower for 3 kW Horizontal Axis Wind Turbine
<p>Structure analyses of a steel tower for Cal Poly's 3 kW small wind turbine is presented. First, some general design aspects of the wind turbine tower are discussed: types, heights, and some other factors that can be considered for the design of wind turbine tower. Then, Cal Poly's wind turbine …
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System Performance Model and Control System for a Small-Scale Horizontal Axis Wind Turbine
<p>Predicting the performance of wind turbines is a key part of the turbine design process and operation, as predictive models play a large role in determining potential power output and efficiency at different operating conditions to help maximize production. On small-scale wind turbines …
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Aerodynamics Analysis of Small Horizontal Axis Wind Turbine Blades by Using 2D and 3D CFD Modelling
… a three-dimensional CFD model of small horizontal axis wind-turbine was produced. The numerical solution was carried out by simultaneously solving the three-dimensional continuity, momentum and the Naveir-Stokes equations in a rotating reference frame using a standard non-linear k-ω …
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Analytical Prediction and Experimental Verification of Blade Loads Experienced by Two, Three-Bladed, Fixed Pitch, Horizontal Axis Wind Turbines
<p>Wind turbine blade structural designers need measured blade structural load data to project blade life. These data are necessary to validate analytical predicton models and to optimize advanced blade structural designs. The objective of this work is to furnish designers current blade load data …
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Preliminary design tools in turbomachinery: Non-uniformly spaced blade rows, multistage interaction, unsteady radial waves, and propeller horizontal-axis turbine optimization
… Lifting line theory for unified propeller and horizontal-axis turbine optimization. Each model has been thoroughly validated with existing models.</p> <p>With these models, non-uniformly spaced blade rows and vane clocking are investigated in detail for their potential use as a passive control …
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Nonlinear dynamic analysis of wind turbine towers subject to design wind and seismic loads
Horizontal Axis Wind Turbines (HAWT) may experience catastrophic failures due to very strong wind and/or seismic loads. Such loads, if not properly addressed, may result in excessive deformations which, in turn, may cause significant damage, or even collapse of wind turbines. This research proposes …
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Nonlinear dynamic analysis of wind turbine towers subject to design wind and seismic loads
Horizontal Axis Wind Turbines (HAWT) may experience catastrophic failures due to very strong wind and/or seismic loads. Such loads, if not properly addressed, may result in excessive deformations which, in turn, may cause significant damage, or even collapse of wind turbines. This research proposes …
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Decoding Meaning in Athenian Vase-Painting of the Archaic and Classical Periods: A Study of Expressions of Communication and Targeted Audiences
… axes. Communication occurring on the vase, the horizontal axis, focuses on the different modes of communication within the image. Communication occurring through the object, the vertical axis, considers the role of the viewer and the relationship between creator, object, and targeted audience. …
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Preliminary design and viability consideration of external, shroud-based stators in wind turbine generators
Horizontal-axis wind turbine designs often included gearboxes or large direct-drive generators to compensate for the low peripheral speeds of the turbine hub. To take advantage of high blade tip speeds, an alternative generator configuration could employ a stator positioned in a shroud on the …
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Effects of wind turbine rotor positioning on tornado induced loads
… induced by a large-scale tornado simulation on a horizontal axis wind turbine (HAWT) to assess the influence of three-dimensional flows with respect to the HAWT position. The loads were analyzed under two rotor operational conditions, idling and parked, at five radial distances. Subsequently, …
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