‘Analysis of the furling system of locally manufactured small wind turbines’


The purpose of this diploma thesis is to study and simulate the passive power control mechanism (furling) in small wind turbines, as well as to verify the results of the simulation with experimental measurements. The experimental measurements of the small horizontal axis wind turbine were carried out in the test field in Rafina.

To begin with, a reference regarding wind power is given and the basic knowledge of aerodynamics regarding the analysis of airfoil characteristics and wind turbine. In addition, various types of furling mechanisms are presented along with the characteristics of the wind turbine studied in the thesis.

Then, the operation of the furling mechanism is theoretically approached and the geometric characteristics of the small wind turbine that affect its behavior are presented. Thereafter, the experimental measurements are listed, while the experimental arrangement of the test field, from which the experimental results of the furling angle have been obtained, is presented.

The NREL’s tool FAST and its potential are presented. FAST is used for the simulation of an onshore and offshore wind turbine in order its results to be compared with the results obtained from the NTUA’s tool GAST.

A full description of the wind turbine characteristics, which are used as input in FAST, is then given. Moreover, the results of the simulation analysis are compared to the experimental measurements.

The conclusions drawn from this diploma thesis are presented in the last chapter. At the same time, suggestions for future research are being discussed.

Key words: furling system, small wind turbines, local manufacturing

Author: Gerasimos Kounadis

Responsible PhD: Latoufis Kostas / latoufis@power.ece.ntua.gr

Supervising Professor: Vasilis Riziotis / vasilis@fluid.mech.ntua.gr

PDF: Full version (Greek) and Short version (English)

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