Searched for: contributor:"Simao Ferreira, Carlos (mentor)"
(1 - 15 of 15)
document
Saes, Thomas (author)
master thesis 2018
document
Faber, Mark (author)
Aeroelastic codes are fundamental for the design of wind turbines and the prediction of instabilities. Such codes rely on engineering models which limit their accuracy. With wind turbine blades becoming more slender to lower the costs, it is important to reduce these uncertainties to maintain a safe and stable turbine design. The dynamic stall...
master thesis 2018
document
van der Deijl, Wessel (author)
In the case of unsteady loading conditions at a rotor, the induced velocity response lags the thrust coefficient at the rotor. The two parameters that are responsible for unsteady loading conditions are rotor thrust (due to blade pitch, or rotational speed) and incoming wind speed. The induced velocity response to these two sources of...
master thesis 2018
document
Gnanasundaram, Arun (author)
The whole construct of explicit algebraic Reynolds stress models, as they are known in RANS, is based on the weak equilibrium assumption. By employing this assumption, and in addition, incorporating models for terms in the Reynolds stress transport equations, the system of six partial differential equations can be simplified to an algebraic form...
master thesis 2018
document
Boohalli Shivamallegowda, Greeshma (author)
Airfoil design plays an important role in improving the performance of Vertical Axis Wind Turbines(VAWTs). The aim of this thesis is to arrive at optimal airfoil geometries to enhance the performance of VAWTs and analyse the performance of these optimal airfoils under steady and unsteady operation conditions of the rotor. The airfoil design is...
master thesis 2018
document
Jadeja, Ashutosh (author)
master thesis 2018
document
Mandru, Manoj (author)
On a typical 2D LEI kite profile, ow separation is expected to occur on both suction and pressure sides of the airfoil. This thesis is aimed to study various inviscid ow models that are capable of modeling such multiple ow separation phenomena. Inviscid models are capable of modeling single ow separation region over typical airfoils. In these...
master thesis 2018
document
Becker, Max (author)
The current wind turbine design tools are based on aerodynamic simulations using blade element momentum (BEM) codes to calculate loads and power, see for instance the tools HAWC2, Bladed or FAST. This engineering method is computationally efficient, but theoretically valid only for steady two dimensional flow in non-yawed conditions.

master thesis 2017
document
Manzoor, Qasim (author)
The Blade Element Momentum (BEM) method is a widely used model for rotor performance and aeroelastic calculations but it has assumptions in its formulation which limit its accuracy. The theoretical background of these limitations has been studied and an improvement in the form of the Near Wake Model (NWM) has been identified. The model adds near...
master thesis 2017
document
Li, Ang (author)
The aim of this thesis is to evaluate the influence between the two counter-rotating VAWT rotors with the Double Actuator Cylinder (DAC) model which will be validated against the panel code. The DAC model is developed from the original Actuator Cylinder (AC) model which includes the Modified-Linear (Mod-Lin) correction. The original AC model for...
master thesis 2017
document
Kaur, karanbir (author)
Experimental Analysis of an Actuator Disk under cyclic unsteady loading.
Wind Energy is one of the cleanest forms of energy. It does not contribute to the greenhouse gases and is also one of the least expensive forms of renewable energy. Due to this, number of wind turbines are increasing annually. Therefore, it is crucial to understand the...
master thesis 2017
document
De Tavernier, Delphine (author)
One of the most commonly used flow control techniques to trim the aerodynamic performance of wind turbine blades are vortex generators. This passive device, which does not require any active energy, is gaining an increasing interest in this sector especially due to the trend of increasing wind turbine size. Vortex generators are a flow control...
master thesis 2016
document
van der Horst, Sander (author)
In the past, the vertical axis wind turbine (VAWT) lost the competition to its horizontal axis counterpart, having (wrongfully) presumed disadvantages like increased fatigue and low efficiency. Little research and development into the VAWT led to a large gap between the maturity of technology of both turbine types. Now that due to modern...
master thesis 2015
document
Hong, Vincent (author)
Wind turbines operate in the earth's atmospheric boundary layer - an environment where the climate is turbulent and unsteady. In addition, wind turbines usually operate in clusters (wind farms) and are thus subjected to the unsteady wakes generated by upstream turbines. Because of the unsteady inflow, wind turbines suffer from structural fatigue...
master thesis 2015
document
Ertem, Sercan (author)
In recent years, the research on Vertical Axis Wind Turbines (VAWTs) have been paving the way for the very large-scale (10-20 MW) floating offshore applications. For a cost effective utilization, VAWTs need to deliver superior aerodynamic and structural performance. Nowadays, the complex ow phenomenon of VAWTs have been better understood and the...
master thesis 2015
Searched for: contributor:"Simao Ferreira, Carlos (mentor)"
(1 - 15 of 15)