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Total 266 records

    Analysis of Blades Surface Effect on Wind Turbine Performance

    , M.Sc. Thesis Sharif University of Technology Sabzehparvar, Amir Ali (Author) ; Sadr Hosseini, Hani (Supervisor) ; Sabzehparvar, Mahdi (Supervisor)
    Abstract
    The development of wind turbine blades model that accurately predict wind turbine thrust in a full range of applicable wind speed has provided a powerful and reliable source for simulation of horizontal axis wind turbine power and thrust force that serves as a valuable tool for wind turbine design and performance analysis. A single-element blade model that reduces the rotor blade characteristics to a lift and drag coefficient vs. angle-of-attack formulation was found to describe accurately the rotor characteristics over a wide operating range. Measurements of wind speed and altitude of wind turbine installation location, rotor speed, and provided thrust is within less than 2% over a wide... 

    An Innovative Method to Monitor Power Production Performance of Wind Farms Using Web-GIS Technique

    , M.Sc. Thesis Sharif University of Technology Pouryousefi, Ali (Author) ; Abbaspour, Madjid (Supervisor) ; Mehdigholi, Hamid (Co-Advisor)
    Abstract
    Nowadays because of population growth and limitation of fossil fuels for power generation purpose, utilization of renewable energy sources has become highlighted. According to the geographical situation for use of wind energy, since some areas of Iran are in suitable conditions the manufacture of wind turbines and installation in wind farms has been under development recently. Monitoring the performance and operation of turbines and wind farms is an inevitable matter. Because of the suitable geographical location of Iran and pursuant to fair wind potential sites widespread this country, this phenomenon requires some backgrounds in many aspects to be achieved. One of the most important... 

    Unsteady Aerodynamic Simulation of Horizontal Axis Wind Turbine (HAWT)

    , M.Sc. Thesis Sharif University of Technology Radmanesh, Amirreza (Author) ; Abbaspour, Madjid (Supervisor) ; Soltani, Mohamad Reza (Co-Advisor)
    Abstract
    The ultimate aim of this research is optimizing high- performance Horizontal Axis Wind Turbine (HAWT) associated with using Computational fluid dynamics (CFD) to predict the flow behavior over wind turbine blades. Computational prediction of the flow over wind turbines is a challenging numerical problem because of the complicated aerodynamics and large variation in length scales. Phenomena such as; the unsteady flow, vortex shedding of the blade tips, flow separation, complicated blade geometry due to variable twist and chord and changes in angle of attack, and highly turbulent flow over blade sections makes CFD prediction challenging, as well as interesting. The goal is to gain an in depth... 

    Condition Monitoring of Wind Turbine Blade Using Fiber Optics

    , M.Sc. Thesis Sharif University of Technology Entessari, Farshid (Author) ; Zabihollah, Abolghasem (Supervisor) ; Behzad, Mehdi (Co-Advisor)
    Abstract
    Over the last decades the attention of the most modern countries about usage of wind has grown due to the recent crisis of energy. This renewable energy source offers a cost effective solution for electricity production. Wind energy is the best candidate among other sources due to wind turbines technology reliability. In order to gain maximum power from wind turbines, their size becomes relatively large, which creates more complexity in their repair and maintenance, furthermore Wind turbine downtime is outside the expectations, which is more costly than corrective maintenance, therefore in order to minimize sudden downtimes and related huge maintenance, a reliable monitoring technique must... 

    Utilization of Airborne Wind Energy in Iran

    , M.Sc. Thesis Sharif University of Technology Hodjat, Ahmad (Author) ; Vesaghi, Mohammad Ali (Supervisor) ; Soltani, Mohammad Reza (Supervisor)
    Abstract
    A Flying Electric Generator (FEG) can be a wind turbine which operates at high altitudes, where there is a continuous fast flow of air and converts wind energy to electrical power.The related field is an interdisciplinary area and is mostly related to the Aerospace Engineering and Energy Conversion. We focused on Iran, as one of the few lands in the northern hemisphere that has a high overall amount of high altitude wind energy for at least half of the year over it, according to the information of atlas of airborne wind energy in this work.So to install the FEGs in Iran, we had to find, places with a safe aerial space overhead which grant us reliable spots over country. These places found by... 

    Optimal Design of Permanent Magnet Vernier Generator for Wind Power Plants Application

    , M.Sc. Thesis Sharif University of Technology Esmailoghli, Habib (Author) ; Boroushaki, Mehrdad (Supervisor)
    Abstract
    In recent decades, renewable energy resources (especially wind power as the fastest-growing energy source) have increasingly been employed for providing electrical energy all over the world given to the rising energy demands, reduction in non-renewable fossil fuels as well as severe restrictions applied to the utilization of these fuels because of their contribution in environmental pollution, generating greenhouse gas emissions, and consequently earth warming. The main factors in the development of wind energy systems to date are the easy access to this energy source in all seasons and its cost-effectiveness compared to other counterparts. One of the key components utilized for converting... 

    Considering the Environmental Effect on the Performance of Vertical Axis
    Wind Turbines (VAWT)

    , M.Sc. Thesis Sharif University of Technology Nasehi, Ali (Author) ; Sattari, Sorna (Supervisor) ; Boroushaki, Mehrdad (Supervisor)
    Abstract
    This project aims to investigate environmental effect –such as dust and rain- on the performance of a vertical axis wind turbine (VAWT). However, those issues are frequently investigated in the horizontal axis wind turbines, but this subject has not been studied in vertical axis wind turbines. Impact of rain or dust particles on the turbine blades can change the turbine performance. So consideration of the impact of environmental factors on the performance of wind turbines is very important. Vertical axis wind turbines, particularly the straight bladed VAWT are widely used in wind power generation in agricultural and rural lighting and the use of this type of turbines is increasing... 

    Simulation of Flow around Building for Using Small wind Turbine in Urban Areas

    , M.Sc. Thesis Sharif University of Technology Sharifi, Pooria (Author) ; Boroushaki, Mehrdad (Supervisor) ; Avami, Akram (Supervisor)
    Abstract
    Wind is one of the clean energies available in the world which its damage to the environment is less than other renewable resources. One of technologies of generating energy from wind is the small turbines installed in city area. However, installing these turbines in cities may encounter with problems such as low speed of wind and high turbulence in the air causing aero-dynamic noise. If the turbines are installed in a bad place in cities, their electricity generation might be zero. Among important parameters that affect the performance of the turbines installed in the roof is the formation of the building, the buildings around, and the location of wind turbine. If the buildings’... 

    Numerical Analysis and Optimization of Backward Swept OnHorizontal Axis Wind Turbine Blade

    , M.Sc. Thesis Sharif University of Technology Salari, Mohammad Sadegh (Author) ; Boroushaki, Mehrdad (Supervisor) ; Rajabi Qahnuyeh, Abbas (Co-Advisor) ; Zarif Boushehri, Behzad (Co-Advisor)
    Abstract
    Aerodynamical design of backward swept for a horizontal axis wind turbine blade has been carried out to produce more power. Computational Fluid Dynamics (CFD) calculations were used for solving the conservation equations in one outer stationary reference frame and one inner rotating reference frame, where the blades and grids were fixed in reference to the rotating frame. The Reynolds Averaged Navier-Stokes (RANS) solver was validated in a test case, the National Renewable Energy Laboratory (NREL) VI blades. Simulation results show considerable agreement with the measurements. Three different turbulence models have been compared: Spalart-Allmaras, the Standard K-ε, and Shear Stress Transport... 

    Numerical Calculation of Air Flow Around and at Wake of the Darrieus Turbine

    , M.Sc. Thesis Sharif University of Technology Ebrahimi Saryazdi, Mohammad (Author) ; Boroushaki, Mehrdad (Supervisor) ; Rajabi, Abbas (Co-Advisor)
    Abstract
    Recently, a lot of attention has been devoted to the use of Darrieus wind turbines because of high power density and environment aspect in urban areas. Turbine airflows don’t effect on the power coefficient of Darrieus turbine. This turbine has an acceptable power coefficient depend on the other wind turbine in the small scale turbine. Aerodynamic performance of a Darrieus turbine is very complex due to phenomena such as dynamic stall and changing forces on the turbine caused by changing horizontal angles. So study airflows around turbine must be preformed. In this thesis the aerodynamics of an H-rotor vertical axis wind turbine (VAWT) has been studied using computational fluid dynamics in... 

    Design, Manufacture & Test a Small Sample of Type Darrieus Vertical Axis Wind Turbine

    , M.Sc. Thesis Sharif University of Technology Khojasteh, Hassan Ali (Author) ; Saboohi, Yadollah (Supervisor) ; Boroushaki, Mehrdad (Supervisor)
    Abstract
    Recently wind turbines with vertical axis attract attention of world’s scientific society to itself because of many reasons such as: ability to work in areas with high turbulency, structural simplicity, independency from wind direction, easy maintenance and low capital cost. So that major part of recent researches in context of wind turbines are about these turbines. In this project a small sample of wind turbine from darrieus type have been designed, manufactured and finally important parameters such as Pitch Angle, Blade numbers and Aspect Ratio have been investigated. Darrieus turbine with 4 Blades and Pitch Angle of +15° was the most appropriate sample between the test samples. In the... 

    Techno-Economic Site-Specific Sizing Optimization of Wind Turbines

    , M.Sc. Thesis Sharif University of Technology Rezaei Mirghaed, Mohammad (Author) ; Roshandel, Ramin (Supervisor)
    Abstract
    The present study was aimed at developing a model to optimize the sizing of wind turbines according to the region’s wind condition and the capital costs of each part of the turbine. The proposed model, which consists of technical aerodynamic, economic and optimization sub-models, is used to achieve maximum annual energy production by a fixed cost of a single or a number of wind turbines. A cost model has been used to determine the detailed cost of the turbine’s components. The model’s results are presented for two regions in Iran, Khaf and Ahar, and the optimized configurations for a single turbine and a wind farm have been investigated.A case study for the region- Manjil that has some... 

    , M.Sc. Thesis Sharif University of Technology Ahmadi, Somayeh (Author) ; Roshandel, Ramin (Supervisor)
    Abstract
    Inappropriate effects of fossil fuels and conventional power generation systems on the environment have necessitated a sustainable energy system for the next decade by growing interests in renewable energy systems. The world’s most fast-growing renewable energy resource is the wind energy. The main problem of wind power is the power fluctuations at the load side caused by the variable nature of wind speed, and the main issue in case of remote locations is the long-term storage of power generated by wind turbines. Batteries can be used to store a limited amount of energy for a short time. Although new advances in this field have been achieved, most common type of batteries is hardly able to... 

    Assessment of Optimal Power Flow (OPF)Uncertainty in Hybrid Wind- PV Power Systems

    , M.Sc. Thesis Sharif University of Technology Aien, Morteza (Author) ; Fotouhi Firouzabad, Mahmoud (Supervisor)
    Abstract
    As a matter of fact, power systems are always faced with a variety of uncertainties. These uncertainties change system parameters in an unwanted manner which may deteriorate the system security and reliability. For instance, a transmission line which is designed for a certain capacity may be suffered as a result of load increment and consequently may influence the normal operation of other network elements. In recent years, as a result of environmental considerations and especially after the oil shock at 1973 which caused the the energy prices to increase unprecedentedly, the human has taken more attention to renewable energies exploitation. Theses energies have a fluctuating nature and are... 

    Energy Storage Systems Operation Strategy in Presence of Wind Farms Based on Consumption Pattern

    , M.Sc. Thesis Sharif University of Technology Kadivar, Alireza (Author) ; Ehsan, Mehdi (Supervisor) ; Fotuhi Firuzabad, Mahmoud (Supervisor)
    Abstract
    World environmental concerns sharp increase in necessity of using energy in comparison with permanent progress in the field of renewal energy technologies causes modern forms of energy sources which can be used by public. This project studies the increasing influence of the wind power in power systems and also designing and exploiting techniques of local saving energy systems. For this purpose, models and possibilities in order to anticipate the operation of wind farm which is connected to grid by saving energy is described. In this project, the operation of compound system components which is totally a combination of three systems is being studied. The considered compound systems consist of... 

    Study of Mechanical Response of Wind Turbine Blades Made of Thermosetting and Thermoplastic Resins

    , M.Sc. Thesis Sharif University of Technology Razaghian, Pardis (Author) ; Abedian, Ali (Supervisor)
    Abstract
    This project has been carried out to investigate the feasibility of using thermoplastic materials in constructing large wind turbine blades made of composite materials. By proving the similarity of the mechanical behavior of blades made of thermoplastic and thermosetting composite materials, the possibility of using these materials with better recycling capabilities has been studied. By studying different thermosetting and thermoplastic resins and checking the Processing methods and mechanical properties of thermoplastic resins, the materials for blades have been selected. The suitable manufacturing method for producing large blades with dimensions above 30 meters is the vacuum-assisted... 

    Development of Actuator Disk Method to Simulate Fluid-structure Interaction in Megawatt Wind Turbine Blade Analysis

    , Ph.D. Dissertation Sharif University of Technology Behrouzifar, Ali (Author) ; Darbandi, Masoud (Supervisor)
    Abstract
    Recent decades have seen a growing demand for high-power wind turbines resulting in turbines with larger blades and the advent of high-megawatt wind turbines. The blades of the megawatt-scale turbines experience more complicated flow phenomena compared to those of the smaller-scale wind turbines. Needless to say, the importance of an accurate solution and detailed analysis of all the parameters, including blades aerodynamic and aeroelastic performance as well as fluid-structure interaction, is more significant for the megawatt-scale turbines compared to smaller-scale turbines. The conventional methods of aerodynamic solutions for the blade, including analytical methods, such as BEMT78 and... 

    Study and Simulation of Vacuum-assisted Thermoplastic Resin Infusion Network for a Wind Turbine Blade

    , M.Sc. Thesis Sharif University of Technology Sharifan, Mostafa (Author) ; Abedian, Ali (Supervisor)
    Abstract
    In recent years, much attention has been paid to wind energy and the expansion of wind farms to replace fossil fuels with this energy source. Wind turbine blades are currently made of composite materials using thermoset matrices. These materials are not recyclable, and it is impossible to return their resins or fibers to the production cycle. In this research, an attempt has been made to replace thermoset resins with thermoplastic materials that can be recycled. In the following, manufacturing and performance aspects of thermoplastic resins have been examined, and the optimal material has been selected using the modified fuzzy logic method (MFLM). In this study, reactive processing of... 

    Effects of Wind Shear Flow on the Aeroelastic Performance of a Large-Scale Wind Turbine with UBEM

    , M.Sc. Thesis Sharif University of Technology Hossein, Amir Hossein (Author) ; Ebrahimi, Abbas (Supervisor) ; Taeibi-Rahni, Mohamad (Supervisor) ; Rezaei, Mohamad Mahdi (Co-Supervisor)
    Abstract
    Study of the structural flexibility of large-scale wind turbine components on aeroelastic performance is important under the existence of critical atmospheric conditions. Prediction and control the critical deformations, identifying maximum local deformation and modeling the forces involved, are required. Aeroelasticity analysis is a suitable method for studying the coupling effects of wind turbine aerodynamics, dynamics and structures. This research has been done by modeling wind turbine components including blades, hub, nacelle and tower, taking into account aerodynamic couplings, dynamics and structures. Considering the large scale of reference wind turbine, nonlinear equations have added... 

    Aeroelastic Analysis of Horizontal Axis Wind Turbine Based on Actuator Disk Method

    , M.Sc. Thesis Sharif University of Technology Nozari, Mostafa (Author) ; Ebrahimi, Abbas (Supervisor) ; Rezaei, Mohammad Mahdi (Co-Advisor)
    Abstract
    The issue of solid and fluid interaction in horizontal axis wind turbines with diameter of more than 120 meters is one of the most important researching subjects of this type of turbines. This issues needs quick and exact solutions because of the high computational cost of fluid and structural domains.In this research a quick method with acceptable accuracy has been suggested which is based on computational fluid dynamic to examine the aeroelastic behavior of rotor and wind turbine tower. The actuator disc method in two domains of axisymmetric and three-dimensional has been used to compute aerodynamic forces. For this purpose a code has been written in C++ to set down virtual momentum on...