Global ETD Search
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Showing 1 to 16 of 16 for “"Horizontal Axis Wind Turbines"”.
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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
… 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 methods. The analysis …
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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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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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A Comparative Study of Two Solution Methods for Blade Momentum Equations Used in the Aerodynamic Analysis and Design of Wind Turbines
… equations are widely used for analyzing the wind turbine aerodynamics and for turbine blade design. Compared to the classical approach to the solution of BEM equations which is relatively complex and can sometime lead to non-convergent solution, recently Andrew Ning has described a simpler …
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Computation of nonlinear hydrodynamic loads on floating wind turbines using fluid-impulse theory
Wind energy is one of the more viable sources of renewable energy and offshore wind turbines represent a promising technology for the cost effective harvesting of this abundant source of energy. To capture wind energy offshore, horizontal-axis wind turbines can be installed on offshore platforms …
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Numerical Modeling and Optimization of Power Generation from Shrouded Wind Turbines
… some researchers that the power coefficient of a wind turbine can be increased beyond the Betz limit for a bare turbine by enclosing the turbine with a duct. In this thesis, this potential for increases in power generation by adding a shroud around a turbine is investigated using numerical flow …
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Experimental Investigation of Wind Loading on a Ducted Wind Turbine
Ducted wind turbines (DWT) are designed to operate in the low-speed wind conditions when compared to the conventional horizontal axis wind turbines. The duct/shroud boosts the power output by increasing the mass flow through the turbine. To enhance our understanding on the impacts of turbulence on …
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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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Control design and energy optimisation of a buoyant airborne wind turbine
Airborne Wind Energy Systems (AWES) aim to capture the wind energy potential at high altitudes by using a combination of tethers and bespoke aerofoils. In contrast to conventional horizontal axis wind turbines (HAWT), the tower is replaced with lightweight tethers resulting in a reduction in both …
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Optimization of Renewable Energy Siting Decisions through Vertical Axis Wind Turbine Integration
The rapid increase in wind energy deployment is critical to achieving net-zero carbon emissions in the United States. However, conventional Horizontal Axis Wind Turbines (HAWTs) face deployment constraints due to their large spatial requirements stemming from their size itself and turbine spacing …
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Assessing the potential for urban wind energy in Cape Town
… it has been argued that small-scale Urban Wind Energy (UWE) could have the potential to provide a significant portion of the electricity demand for urban areas. However there is currently a lack of knowledge surrounding the realisable potential for UWE, especially in the South African …
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Optimization of Wind Turbine Airfoils/Blades and Wind Farm Layouts
… optimization is widely used in the design of wind turbine blades. In this dissertation, a numerical optimization method called Genetic Algorithm (GA) is applied to address the shape optimization of wind turbine airfoils and blades. In recent years, the airfoil sections with blunt trailing edge …
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Optimized design of aerodynamic airfolis for vertical axis wind turbines
… increasing over the past years. Nowadays, wind energy represents one of the most economical options, employing a totally mature harvesting technology. Due to their higher energy output, horizontal-axis wind turbines have been traditionally the preferred option. Nevertheless, vertical-axis …
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The spectral characteristics of wind-farm power output
Over time-scales short enough that wind is relatively steady (.10 minutes), wind-power variability is due to atmospheric turbulence. Power fluctuations at time scales such as these are important for maintaining frequency regulation on the power grid. This thesis presents a holistic, physics-based …