University of Twente Student Theses


Multilevel panel method validation using the New MEXICO Wind Tunnel Measurements

Prieto Serratos, Erik Armando (2017) Multilevel panel method validation using the New MEXICO Wind Tunnel Measurements.

Abstract:Human activities nowadays have a huge impact in the world. The best-known consequence is “climate change” that is heavily related to our excessive consumption of natural resources. This provokes numerous problems like the production of greenhouse gases that trap heat in the atmosphere and change the natural climate conditions on earth. Increasing the use of renewable energies such as solar, biomass and wind power is a relevant and important strategy nowadays for combating climate change due to the rising energy consumption in the world. Among all the energy solutions, wind energy is catalogued as the second most influential solution to reduce CO2 emissions just after “Refrigerant Management”. Wind energy keeps growing and new developments are carried out constantly in all areas. Several developments are related to the correct prediction of aerodynamic phenomena that are present in the extraction of energy from the wind. Developments in the aerodynamic theory help to predict the forces acting on the wind turbine and improve the power production of the turbines. The blade element momentum (BEM) theory is one of the earliest aerodynamic theories for wind turbines and is still in use nowadays. The more advanced methods are based on Reynolds-Averaged Navier-Stokes (RANS) equations and make use of turbulent models or even resort to Large Eddy Simulation (LES). Some of these methods constitute what is known as Computation Fluid Dynamics (CFD), a field that has a wide range of methods to solve fluid flow problems. Generally, these methods involve complicated mathematical and numerical approaches and while being accurate their application is computationally expensive and too slow for use in day to day design practice. In this thesis, the validation of a so-called `Multilevel Panel Method' is performed. The panel method is an attractive flow analysis technique that, in contrast to other CFD methods, is computationally efficient and still has fundamental physics involved to work out the solutions. The validation is performed using the results from a European wind tunnel experiment called “New MEXICO. We demonstrate the fidelity of the advanced multilevel panel method under unsteady conditions. We consider cases with rotor yaw at angles -30º, 15º, 30º and 45º, and two types of step changes, steps in rotational velocity and steps in rotor blade pitch angle. This thesis concludes by giving some recommendations for further validations and the use of the state-of-the-art multilevel panel method.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:02 science and culture in general, 43 environmental science, 50 technical science in general, 52 mechanical engineering
Programme:Sustainable Energy Technology MSc (60443)
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