The study of rotor blade aerodynamic performances of wind turbine has been presented in this thesis. This study was focused on aerodynamic effects changed by blade surface distribution as well as grid solution along the airfoil. The details of numerical calculation from Fluent were described to help predict accurate blade performance for comparison and discussion with available data. The direct surface curvature distribution blade design method for two-dimensional airfoil sections for wind turbine rotors have been discussed with the attentions to Euler equation, velocity diagram and the factors which affect wind turbine performance and applied to design a blade geometry close to an existing wind turbine blade, Eppler387, in order to argue that the blade surface drawn by direct surface curvature distribution blade design method contributes aerodynamic efficiency. The FLUENT calculation of NACA63-215V showed that the aerodynamic characteristics agreed well with the available experimental data at lower angles of attack although it was discontinuities in the surface curvature distributions between 0.7 and 0.8 in x/c. The discontinuities were so small that the blade performance could not be affected. The design of Eppler 387 blade performed to reduce drag force. The discontinuities of surface distribution matched the curve of the pressure coefficients. It was found in the curvature distribution that the leading edge pressure side had difficulties to connect to Bezier curve and also the trailing edge circle was never be tangent to the lines of trailing edge pressure and suction sides due to programming difficulties.

Aerodynamics of wind turbines

A critical review on the simulations of wind turbine aerodynamics focusing on hybrid RANS-LES methods

Multi-objective optimisation of horizontal axis wind turbine structure and energy production using aerofoil and blade properties as design variables

https://pure.tue.nl/ws/files/74680642/rezafluc2017.pdf

Fluctuations of angle of attack and lift coefficient and the resultant fatigue loads for a large Horizontal Axis Wind turbine

This course material is used in two courses in the Internatio l Master’s programmeApplied Mechanicsat Chalmers. The two courses are TME225 Mechanics of fluids, andMTF270 Turbulence Modeling . MSc students who follow these courses are supposed to have taken one basic course in fluid me chanics. This document can be downloaded at http://www.tfd.chalmers.se/ ̃lada/MoF/lecture notes.html

/pdf/fluid-mechanics-turbulent-flow-and-turbulence-modeling-xfbnumm23x.pdf

Fluid mechanics, turbulent flow and turbulence modeling

In the last decade, we have heard more and more about the need of renewable
clean energy, but not much has been done. Currently, the wind power
energy is the most popular of all of these green technologies. Thousands of
wind turbines are being invested and installed everywhere worldwide. Thus,
many questions arise.
The aerodynamic loads on the rotor blades are the largest loads acting on
a wind turbine. The horizontal wind turbine types of blades are usually made
of two or three airfoils such as a propeller. In these types of blades, it is the
lift force which makes the rotor turn. The drag force acts perpendicular to
the lift force due to the resistance of the airfoil from the wind and counteracts
the rotation to rotor. Therefore, predicting these loads accurately is one of
the most important parts of the calculations in wind turbine aerodynamics.
Another reason for computing the aerodynamic loads on rotor blades is to
model the aeroelastic response of the entire wind turbine construction. There
are different methods to calculate the aerodynamic loads on a wind turbine
rotor with different level of complexity such as Blade Element Momentum
Method (BEM), Vortex Method, Panel Method and Computational Fluid
Dynamics (CFD). Most aerodynamic codes use BEM (together with many
additions) which is very fast and gives fairly accurate results.
The main goal of this project is studying the Helical Vortex Method.
In this text, helical vortex method has been developed and compared with
Blade-Element Momentum (BEM) theory for the analysis of wind turbine
aerodynamics.

/pdf/aerodynamic-loads-on-rotor-blades-csxmr96jbz.pdf

Aerodynamic Loads On Rotor Blades

The aerodynamics of a wind turbine is governed by the flow
around the rotor, where the prediction of air loads on rotor
blades in different operational conditions and its relation to rotor structural dynamics is crucial for design purposes. One of the most important challenges in wind turbine aerodynamics is therefore to accurately predict the forces on the blade, where the blade and wake are modeled by different approaches such as the Blade Element Momentum (BEM) theory, the vortex method and Computational Fluid Dynamics (CFD).
A free vortex wake method, based on the potential, inviscid
and irrotational flow, is developed to study the aerodynamic
loads. The results are compared with the BEM method,
the GENUVP code and CFD.

/pdf/development-of-free-vortex-wake-method-for-aerodynamic-loads-2fgkgdlww5.pdf

Development of Free Vortex Wake Method for Aerodynamic Loads on Rotor Blades

Today, wind power is one of the most reliable new energy source serving as an alternative to fossil-fuel generated electricity and is known as widely-distributed clean and renewable energy source. It is now the world’s fastest growing energy source and has also become one of the most rapidly expanding industries. The aerodynamics of a wind turbine are governed by the flow around the rotor where the prediction of air loads on rotor blades in different operational conditions and its relation to rotor structural dynamics is crucial for design purposes. Therefore, one of the most important challenges in wind turbine aerodynamics is to predict the forces on the blade accurately where the blade and wake are modeled by different approaches such as Blade Element Momentum (BEM) theory, vortex method and Computational Fluid Dynamics (CFD). In this paper, the application of vortex method for wind turbine aerodynamic performance is used. Different blade models such as lifting line and lifting surface with prescribed wake model are studied. The main purpose is to find the proper combination of blade and wake model influencing the aerodynamic loads as well as the computational time efficiency. The results of different approaches are compared with the GENUVP code. (See acknowledgements)

/pdf/vortex-method-application-for-aerodynamic-loads-on-rotor-58j67evrt6.pdf

Vortex method application for aerodynamic loads on rotor blades

Numerical modelling of neutral atmospheric boundary layer flow through heterogeneous forest canopies in complex terrain (a case study of a Swedish wind farm)

Liquid hydrogen (LH2) has long been seen as a technically feasible fuel for a fully sustainable greener aviation future. The low density of the cryogenic fuel would dictate the redesign of commercial aircraft to accommodate the large tanks, which are unlikely to be integrated within the whole internal volume of the wing. In the ENABLEH2 project, the morphological aspects of a LH2 aircraft design are discussed and a methodology for rapid concept comparative assessment is proposed. An exercise is then carried on to down-select short-to-medium range (SMR) and long-range (LR) concepts, able to carry 200 passengers for 3000 nmi and 414 passengers for 7500 nmi respectively. The down-selection process was split into two phases with the first considering 31 potential airframe architectures and 21 propulsion-system arrangements. The second phase made the final down-selections from a short-list of nine integrated design concepts that were ranked according to 34 criteria, relating to operating cost, revenue, noise and safety. Upon completion of the process, a tube and wing design with the tanks integrated into extended wing roots, and a blended-wing-body design were selected as the best candidates for the SMR and LR applications respectively. Both concepts feature distributed propulsion to maximise synergies from integrating the airframe and propulsion systems.

Hamidreza Abedi

Papers

Aerodynamic Loads On Rotor Blades

Development of Free Vortex Wake Method for Aerodynamic Loads on Rotor Blades

Vortex method application for aerodynamic loads on rotor blades

Numerical modelling of neutral atmospheric boundary layer flow through heterogeneous forest canopies in complex terrain (a case study of a Swedish wind farm)

Synergistic Technology Combinations for Future Commercial Aircraft Using Liquid Hydrogen