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 15 of 15 for “"Blade Element Momentum Theory"”.
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Performance Evaluation of Wind Turbine Blades using Blade Element Momentum Theory and Flow Simulation Techniques
… to evaluate the performance of two wind turbine blades. The first study consisted of a computational flow simulation conducted to predict underperformance of a stall regulated wind turbine rotor. A hypothesis was proposed explaining the causes for the underperformance of an 8kW stall regulated …
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Low-Tip-Speed High-Torque Proprotor Noise Approximation for Design Cycle Analysis
… approximation was based on geometry by using the blade element momentum theory, and calculating the pressure distribution along the blade surface using Drela's Xfoil (2001). The noise approximation, performed using Brentner's PSU-WOPWOPv3 (2017), was validated with known data obtained from …
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A parabolized Navier-Stokes method for wind farm applications
… is based on the Actuator Line rotor model and Blade Element Momentum theory. The developed PNS method is validated and verified using several test cases and a wind farm simulation on a desktop computer has a runtime of only several hours.
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Development of a morphing helicopter blade with electrochemical actuators
… for the development of a morphing helicopter blade is explored. Using commercially available lithium-ion batteries as demostrators of the technology, two actuator prototypes suitable for the application are developed. The first prototype consists of a weave of fibers enclosing an array of …
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Passive aeroelastic tailoring of wind turbine blades : a numerical analysis
… the rotor was not designed for. Since the ideal blade shape changes nonlinearly with rising wind speeds currently used pitch control mechanisms can only approach the ideal blade deformation. However aeroelastic effects, which cause additional deformation, are almost unavoidable in flexible blade …
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Small-scale Wind Energy Portable Turbine (SWEPT)
… An inverse design and optimization tool based on Blade Element Momentum theory is proposed. The utility and efficacy of the tool was validated by demonstrating a 40 cm diameter small-scale wind energy portable turbine (SWEPT) operating in very low wind speed range of 1 m/s-5 m/s with extremely …
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Noise And Propulsive Efficiency Interactions For Rotors And Propellers At Constant Thrust
… torque, by adjusting the collective pitch of the blades. This research will show that, for a rotor at constant thrust, the minimum noise (from loading and thickness contributions) and minimum power operating points in terms of rotor RPM and collective blade pitch, are not the same thus leading to …
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Investigation of the Aerodynamic and Acoustic Performance of a Scaled eVTOL Propeller in Axial and Non-Axial Flight
… experimental propeller operating with various blade pitch angles, yaw angles, and under several inflow velocities. The experimental results are subsequently compared to a custom-developed Blade Element Momentum Theory (BEMT) utility for low-fidelity predictions. The findings aim to provide …
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Analytical Unsteady Aerodynamic Models for Horizontal Axis Wind Turbines
… 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 covers unsteady loading due to fast pitch …
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Simulations of a self propelled autonomous underwater vehicle
… with a body force propeller model based on blade element momentum theory has been developed. This discretises the propeller plane into a series of radial and circumferential sectors. The local axial and tangential inflow conditions at each sector of the propeller plane can then be …
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Design of Percutaneous Dual Propeller Pump to assist Patients with Single Functional Ventricle
… SVC. An inverse design methodology implementing Blade Element Momentum theory and Goldstein's radial momentum loss theory was employed to generate the blade profiles for the studied propeller pumps. The propeller blade profiles generated from the inverse design optimization code were examined for …
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A hydrodynamic analysis of deep-water moorings
… The aerodynamic modelling was based on the blade element momentum theory, while the mooring system global performance was simulated by the indirect time-domain method. By performing a comprehensive parametric study, the effects of the second-order wave drift force and the aerodynamic turbine …
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The prediction of unsteady three-dimensional aerodynamics on wind turbine blades
… method adopted in this study, a classic Blade Element Momentum theory model, BEM, is described next and its extension to yawed flow is detailed for completeness. Analysis then focuses on how stall delay due to three-dimensional effects can be predicted on a HAWT. Implementation of a …
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Synergistic design of a combined floating wind turbine - wave energy converter
… equation for wave viscosity and quasi-steady blade-element/momentum theory for rotor aerodynamics, we find that viscous effects and nonlinear aerodynamics may increase the FWT motion and tower stress by up to 15% in some wind-sea states compared the the Taylor series linearized system. Second, …
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An investigation of a scalable flight control system for a variable pitch, fuel powered, quad-rotor craft
Submitted in the fulfillment of requirements of the degree of Master of Mechanical Engineering, Durban University of Technology, Durban, South Africa, 2023.