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Wind energy has been attracting more and more attentions due to its clean and renewable source. The aerodynamic characteristic of wind turbine airfoil directly affects the turbine efficiency. In this paper, Computational fluid dynamics (CFD) analysis of the two-dimensional air flow over a wind turbine NACA 2414 airfoil at various angles of attack a...
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The application of computational fluid dynamics (CFD) in wind turbine design and analysis is becoming increasingly common in research on wind energy, resulting in a better knowledge of the aerodynamic behaviour of rotors. Due to the deformation of blade airfoils on account of icing, a significant drop in aerodynamic performance brings wind turbines...
Turbines are efficient power generators.
Because wind energy is a clean fuel source, it is widely utilized in some
regions. One of the major factors affecting wind turbine performance is the
angle of attack of the blade. The aerodynamics and efficiency can be improved
by improvising the lift-to-drag ratio CL/CD to get the best design for wind
turbi...
Wind Energy is a fast-developing type of intensity age the world over. This is to a limited extent because of worries over worldwide environmental change and vitality security while interest for electrical vitality keeps on developing. Power request is proposed to develop at a yearly pace of 2.4% all around. Modern horizontal axis wind turbines hav...
Micro wind energy harvester (MWEH) can provide eco-friendly and sustainable energy for low-power electric devices like wireless sensors. The performance of the wind turbine can be enhanced by applying a duct with a brim. In this work, the characteristic study was performed when the duct is applied to the MWEH through the computational fluid dynamic...
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The design and application of eddy current brakes (ECBs) should be simple; further, ECBs should be used semi-permanently. This study aimed to determine major parameters for designing an ECB that can be applied to a small-scale wind turbine generator. To this end, an ECB was developed that could actuate without additional power, thus improving the e...
Citations
... A semi-circular-rectangular shaped flow domain was selected and Spalart Allmaras viscous model was used. Muftah [8] used similar shaped domain for analysis of NACA 2414 airfoil in COMSOL Multiphasic Design modeler. Spalart Allmaras viscous model was used to obtain contours for velocity and pressure. ...
... At 0º AoA value of CL is greater than zero and it becomes zero at negative AoA, this is one of the characteristics of the cambered airfoil profile. Among the previous studies, similar results were also reported by Sahin and Acir [7] for NACA 0015 profile, by Muftah [8] for NACA 2414 airfoil profile and by Kulshreshtha et al. [9] for NACA 2412 profile. ...
This paper presents a design of force balance setup that can measure lift force acting on the aircraft model. The setup was developed indigenously and installed in an open circuit low-speed wind tunnel. It mainly consists of two components viz. a traverse mechanism that can hold the model in the test section at different angles of attack and air speeds and a supporting frame to hold the traverse mechanism over it. The spring balances are used to obtain lift force readings at different angles and air speeds. The experimental and numerical investigations were done in the wide range of Reynolds number (range: 0.55 to 1.12 lakh) and angle of attack (range: -6° to 20°). The results are presented in terms of pressure contours, velocity contours, pressure coefficient and lift coefficient. From the experiments it was found that value of lift coefficient increases with angle of attack and stalling occurs at 18° for all the air speeds. However, in the numerical results the stalling was observed little earlier than 18° angle of attack. The experimental results were compared with CFD results and an average relative error of 18% was observed which may be due to assumption of 2-D airfoil in CFD analysis.
... Unstructured mesh around an airfoil[86] ...
Occurrences such as the global climate change have presented critical challenges to humanity and necessitated studies into how greenhouse gas emissions can be minimised. One practical solution is the generation of power from renewable and sustainable sources; hence, tidal current energy which, however, also gives rise to the concept of fluid-structure interaction (FSI). The pressure and fluid flow aspects affect the structural deformations and the structural deformations in turn affect pressure and flow. This paper presents a perspective review of FSI based optimisation in tidal turbines with a focus on low-order aerodynamic, computational fluid dynamics (CFD) and structural modelling. It was acknowledged that, to aid humanity amidst the issue of using renewable or non-renewable sources of energy, practical solutions such as generating renewable energy from sustainable sources are effective. Tidal current energy was found to be one of the most reliable solutions but further studies regarding its practicality was advised.
... According to the experiences of predecessors [26] the selected airfoil grid shape is free C-shape which can make the mesh generation convenient. The free (unstructured) meshing method is used to mesh the airfoil grid, the unstructured meshing method has been also used by [27,28]. The mesh is calibrated for fluid dynamics models. ...
The work presents a CFD modeling using Comsol Multiphysics to find the optimal design of wind turbine airfoils. This study has two parts, the first part is to find the optimal angle of attack of the initial NACA airfoil in different operating conditions of a wide range of Reynolds number taking into account the aerodynamics performance before and after optimization. The second part is to study the effect of decoupling camber and its position as control shape parameters on the aerodynamics performance as objectives function with varying thickness of airfoils. The results illustrated that, compared to an initial NACA 4digit airfoil, the optimized airfoils lift to drag ratio was improved over a wide range of Reynolds number and the maximum thickness of airfoil. The results showed also that the blade with the optimized airfoil has a higher efficiency.
While wind energy, which has an important place among renewable energy sources, is converted into electrical energy by means of wind turbines, the designs and aerodynamic behaviors of turbine blades gain importance in order to obtain optimal efficiency. The most important factor affecting the wind energy capture performance and aerodynamic behavior of the blade is the aerofil structure. In this study, the design and comparative performance analysis of NACA 2414 and NACA 6409 series airfoils under wind turbine conditions with 1x10^6 fixed reynolds number, 0-20^0 attack angles, constant air density and ambient conditions, 3kW nominal power and 2m blade length were carried out. The designs and analyzes for both airfoils were simulated using Q-Blade software version 2.0.5.2. While designing the blade, the propeller blade was divided into 20 equal parts so that there would be no aerodynamic interaction between the elements, and analyzes were made with a calculation method based on the Blade Element Momentum (BEM) theory. As a result, by comparing different features such as lift (Cl) and drag (Cd) coefficients, pressure distribution on the blades, power coefficients, it was seen that the NACA 6409 airfoil was more efficient than the NACA 2414 airfoil for small diameter wind turbines.
Rüzgâr türbinlerinden elde edilen enerji miktarı her geçen gün artmaktadır. Rüzgâr türbinlerinin güç çıkışlarını etkileyen faktörlerden birisi de kanat profilleridir. Bu çalışmada rüzgâr türbinlerinde kullanılan farklı (NACA 0009, NACA 2415, NACA 4415, NACA 4424, NACA 6412, NACA 6415, NACA 24112, FX 63-137, GOE 795, NREL’s S824, SD 5060, SG6040) kanat profillerinin Qblade yazılımı kullanılarak simülasyonları oluşturulup sayısal analizleri yapılmış ve aerodinamik performansları incelenmiştir. Sayısal analizler 0°- 20° arası hücum açılarında ve 5x104, 2x105 1x106 Reynolds sayılarında gerçekleştirilmiştir. En yüksek aerodinamik verimliliğe sahip kanat profilleri NACA 6412, NACA 6415 ve NACA 4415 olarak belirlenmiş ve bu kanat profillerinden üç kanatlı rüzgâr türbini oluşturulup elde edilen güç çıkışları ve performans değerleri bulunmuştur. Bu kanat profilleri için uç-hız oranı 6.5 ila 7.8 aralığında maksimum verim alınmıştır. Sonuç olarak rüzgâr türbinlerinde NACA 6412, NACA 6415 ve NACA 4415 kanat profilleri kullanılarak türbinden alınacak verim maksimum seviyede olacaktır. Bu çalışmada, literatürde mevcut olmayan AG37, AH 80-140 NACA 8824 ve RG-12 kanat profilleri literatüre katkı sağlamak amacıyla analiz edilmiştir.
Rüzgâr türbinlerinden elde edilen enerji miktarı her geçen gün artmaktadır. Rüzgâr türbinlerinin güç çıkışlarını etkileyen faktörlerden biriside kanat profilleridir. Bu çalışmada rüzgâr türbinlerinde kullanılan farklı (NACA 0009, NACA 2415, NACA 4415, NACA 4424, NACA 6412, NACA 6415, NACA 24112, FX 63-137, GOE 795, NREL's S824, SD 5060, SG6040) kanat profillerinin Qblade yazılımı kullanılarak simülasyonları oluşturulup sayısal analizleri yapılmış ve aerodinamik performansları incelenmiştir. Sayısal analizler 0°- 20° arası hücum açılarında ve 5x104, 2x105 1x106 Reynolds sayılarında gerçekleştirilmiştir. En yüksek aerodinamik verimliliğe sahip kanat profilleri NACA 6412, NACA 6415 ve NACA 4415 olarak belirlenmiş ve bu kanat profillerinden üç kanatlı rüzgâr türbini oluşturulup elde edilen güç çıkışları ve performans değerleri bulunmuştur. Bu kanat profilleri için uç-hız oranı 6.5 ila 7.8 aralığında maksimum verim alınmıştır. Sonuç olarak rüzgâr türbinlerinde NACA 6412, NACA 6415 ve NACA 4415 kanat profilleri kullanılarak türbinden alınacak verim optimum seviyede olacaktır.
