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Hamidreza Abedi

Bio: Hamidreza Abedi is an academic researcher from Chalmers University of Technology. The author has contributed to research in topics: Turbine & Aerodynamics. The author has an hindex of 5, co-authored 13 publications receiving 67 citations.

Papers
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Dissertation
01 Jan 2011
TL;DR: In this article, the helical vortex method has been developed and compared with the BEM theory for the analysis of wind turbine aerodynamics, and the main goal of this project is studying the Helical Vortex Method.
Abstract: 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.

15 citations

Dissertation
01 Jan 2014
TL;DR: In this article, a free vortex wake method, based on the potential, invisciduity and irrotational flow, is developed to study the aerodynamic load of wind turbines.
Abstract: 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.

14 citations

01 Jan 2013
TL;DR: In this paper, the application of vortex method for wind turbine aerodynamic performance is used, 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.
Abstract: 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)

11 citations

Journal ArticleDOI
TL;DR: In this paper, large-Eddy simulation of the neutral ABL flow for a midwestern Sweden wind farm is performed, which exposes the risk of generalization of wind conditions from a single met-mast measurement to be representative of the actual flow field in a wind farm situated in complex terrain.

8 citations

Proceedings ArticleDOI
TL;DR: 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.
Abstract: 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.

8 citations


Cited by
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Dissertation
01 Jan 2011
TL;DR: In this paper, a study of rotor blade aerodynamic performances of wind turbine has been presented in which the aerodynamic effects changed by blade surface distribution as well as grid solution along the airfoil.
Abstract: 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.

311 citations

Journal ArticleDOI
01 Nov 2017-Energy
TL;DR: The hybrid RANS-LES method (HRLM) as mentioned in this paper is a technique to bridge the gap between less accurate RANS and more computational costly LES method, which is a remedy to turbine aerodynamics in complex flow conditions.

112 citations

Journal ArticleDOI
TL;DR: In this article, the authors use a Computational Blade Optimization and Load Deflation Tool (CoBOLDT) to investigate the three extreme point designs obtained from a multi-objective optimisation of turbine thrust, annual energy production as well as mass for a horizontal axis wind turbine blade.

84 citations

Journal ArticleDOI
TL;DR: In this article, the effects of various atmospheric and operational parameters on the fluctuations of α and CL for a large HAWT were investigated, including turbulence, wind shear, yawed inflow, tower shadow, gravity and rotational imbalances.

58 citations

01 Jan 2020
TL;DR: This course material was used in two courses in the Internatio l Master's program of applied mechanics at Chalmers as discussed by the authors, TME225 Mechanics of fluids, and MTF270 Turbulence Modeling.
Abstract: 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

53 citations