scholarly journals Numerical Studies on a NACA0018 Airfoil Blade HAWT with Trailing Edge Jet Flow

2018 ◽  
Vol 64 ◽  
pp. 07008
Author(s):  
Hsu Uzu-Kuei ◽  
Tai Cheng-Hsien ◽  
HSU Chia-Wei ◽  
Miau Jiun-Jih
Keyword(s):  
Wind Speed ◽  
Cfd Simulation ◽  
Turbine Blades ◽  
Jet Flow ◽  
Horizontal Axis Wind Turbine ◽  
Trailing Edge ◽  
Rotating Speed ◽  
Initiation Phase ◽  
Wind Speeds ◽  
Naca0018 Airfoil

This study analyzed an airfoil blade for a horizontal-axis wind turbine (HAWT) with a trailing-edge jet flow design. This design was realized by drilling a hole in the trailing edge of an NACA0018 blade of a conventional HAWT to serve as a pressure injection nozzle. Five inflow wind speeds and three trailing-edge jet flow conditions were examined in the test. The results revealed the efficiency differences between a HAWT with the new jet flow design and conventional HAWTs. The experimental methods employed involved a wind tunnel experiment and a computational fluid dynamics (CFD) simulation. The results revealed that when the inflow wind speed was low, the trailing-edge jet flow accelerated the initiation phase and increased the rotating speed of the HAWT; however, when the inflow wind speed was high, damping occurred and the rotating speed of the turbine blades decreased.

scholarly journals Investigation of an Innovative Rotor Modification for a Small-Scale Horizontal Axis Wind Turbine

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2649 ◽  
Author(s):  
Artur Bugała ◽  
Olga Roszyk
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Cfd Simulation ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Small Scale ◽  
Horizontal Axis Wind Turbine ◽  
Airflow Distribution

This paper presents the results of the computational fluid dynamics (CFD) simulation of the airflow for a 300 W horizontal axis wind turbine, using additional structural elements which modify the original shape of the rotor in the form of multi-shaped bowls which change the airflow distribution. A three-dimensional CAD model of the tested wind turbine was presented, with three variants subjected to simulation: a basic wind turbine without the element that modifies the airflow distribution, a turbine with a plano-convex bowl, and a turbine with a centrally convex bowl, with the hyperbolic disappearance of convexity as the radius of the rotor increases. The momentary value of wind speed, recorded at measuring points located in the plane of wind turbine blades, demonstrated an increase when compared to the base model by 35% for the wind turbine with the plano-convex bowl, for the wind speed of 5 m/s, and 31.3% and 49% for the higher approaching wind speed, for the plano-convex bowl and centrally convex bowl, respectively. The centrally convex bowl seems to be more appropriate for higher approaching wind speeds. An increase in wind turbine efficiency, described by the power coefficient, for solutions with aerodynamic bowls was observed.

Optimal Design of Horizontal Axis Wind Turbine Blades

2008 ◽  
Author(s):  
Ohad Gur ◽  
Aviv Rosen
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Design Method ◽  
Turbine Blades ◽  
Horizontal Axis ◽  
Optimization Strategy ◽  
Wind Turbine Blades ◽  
Horizontal Axis Wind Turbine ◽  
Wind Speeds ◽  
Design Variables

The optimal aerodynamic design of Horizontal Axis Wind Turbine (HAWT) is investigated. The Blade-element/Momentum model is used for the aerodynamic analysis. In the first part of the paper a simple design method is derived, where the turbine blade is optimized for operation at a specific wind speed. Results of this simple optimization are presented and discussed. Besides being optimized for operation at a specific wind speed, without considering operation at other wind speeds, the simple model is also limited in the choice of design goals (cost functions), design variables and constraints. In the second part of the paper a comprehensive design method that is based on a mixed numerical optimization strategy, is presented. This method can handle almost any combination of: design goal, design variables, and constraints. Results of this method are presented, compared with the results of the simple optimization, and discussed.

Study on the Relation Between Side Ratios of Rectangular Cross Sections and Secondary Vortices at Trailing Edge in Motion-Induced Vortex Excitation

2017 ◽  
Author(s):  
Kazutoshi Matsuda ◽  
Kusuo Kato ◽  
Kouki Arise ◽  
Hajime Ishii
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Cross Sections ◽  
Leading Edge ◽  
Trailing Edge ◽  
Wind Speeds ◽  
Smoke Flow ◽  
Flow Visualizations ◽  
Institute Of Technology ◽  
Secondary Vortices

According to the results of conventional wind tunnel tests on rectangular cross sections with side ratios of B/D = 2–8 (B: along-wind length (m), D: cross-wind length (m)), motion-induced vortex excitation was confirmed. The generation of motion-induced vortex excitation is considered to be caused by the unification of separated vortices from the leading edge and secondary vortices at the trailing edge [1]. Spring-supported test for B/D = 1.18 was conducted in a closed circuit wind tunnel (cross section: 1.8 m high×0.9 m wide) at Kyushu Institute of Technology. Vibrations were confirmed in the neighborhoods of reduced wind speeds Vr = V/fD = 2 and Vr = 8 (V: wind speed (m/s), f: natural frequency (Hz)). Because the reduced wind speed in motion-induced vortex excitation is calculated as Vr = 1.67×B/D = 1.67×1.18 = 2.0 [1], vibrations around Vr = 2 were considered to be motion-induced vortex excitation. According to the smoke flow visualization result for B/D = 1.18 which was carried out by the authors, no secondary vortices at the trailing edge were formed, although separated vortices from the leading edge were formed at the time of oscillation at the onset wind speed of motion-induced vortex excitation, where aerodynamic vibrations considered to be motion-induced vortex excitation were confirmed. It was suggested that motion-induced vortex excitation might possibly occur in the range of low wind speeds, even in the case of side ratios where secondary vortices at trailing edge were not confirmed. In this study, smoke flow visualizations were performed for ratios of B/D = 0.5–2.0 in order to find out the relation between side ratios of rectangular cross sections and secondary vortices at trailing edge in motion-induced vortex excitation. The smoke flow visualizations around the model during oscillating condition were conducted in a small-sized wind tunnel at Kyushu Institute of Technology. Experimental Reynolds number was Re = VD/v = 1.6×103. For the forced-oscillating amplitude η, the non-dimensional double amplitudes were set as 2η/D = 0.02–0.15. Spring-supported tests were also carried out in order to obtain the response characteristics of the models.

Numerical Studies of the Effects of Active and Passive Circulation Enhancement Concepts on Wind Turbine Performance

2006 ◽  
Vol 128 (4) ◽  
pp. 432-444 ◽  
Author(s):  
Chanin Tongchitpakdee ◽  
Sarun Benjanirat ◽  
Lakshmi N. Sankar
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Turbine Rotor ◽  
Horizontal Axis Wind Turbine ◽  
Trailing Edge ◽  
Low Wind Speed ◽  
Gurney Flap ◽  
Coanda Jet

The aerodynamic performance of a wind turbine rotor equipped with circulation enhancement technology (trailing-edge blowing or Gurney flaps) is investigated using a three-dimensional unsteady viscous flow analysis. The National Renewable Energy Laboratory Phase VI horizontal axis wind turbine is chosen as the baseline configuration. Experimental data for the baseline case is used to validate the flow solver, prior to its use in exploring these concepts. Calculations have been performed for axial and yawed flow at several wind conditions. Results presented include radial distribution of the normal and tangential forces, shaft torque, root flap moment, and surface pressure distributions at selected radial locations. At low wind speed (7m∕s) where the flow is fully attached, it is shown that a Coanda jet at the trailing edge of the rotor blade is effective at increasing circulation resulting in an increase of lift and the chordwise thrust force. This leads to an increased amount of net power generation compared to the baseline configuration for moderate blowing coefficients (Cμ⩽0.075). A passive Gurney flap was found to increase the bound circulation and produce increased power in a manner similar to Coanda jet. At high wind speed (15m∕s) where the flow is separated, both the Coanda jet and Gurney flap become ineffective. The effects of these two concepts on the root bending moments have also been studied.

scholarly journals Aerodynamic Analysis on Wind Turbine Aerofoil

2018 ◽  
Vol 7 (3.27) ◽  
pp. 456
Author(s):  
Albi . ◽  
M Dev Anand ◽  
G M. Joselin Herbert
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Cfd Simulation ◽  
Turbine Blades ◽  
Wind Turbine Blade ◽  
Wind Turbine Blades ◽  
Ansys Fluent ◽  
Wind Speeds ◽  
Drag Forces ◽  
Lift And Drag

The aerofoils of wind turbine blades have crucial influence on aerodynamic efficiency of wind turbine. There are numerous amounts of research being performed on aerofoils of wind turbines. Initially, I have done a brief literature survey on wind turbine aerofoil. This project involves the selection of a suitable aerofoil section for the proposed wind turbine blade. A comprehensive study of the aerofoil behaviour is implemented using 2D modelling. NACA 4412 aerofoil profile is considered for analysis of wind turbine blade. Geometry of this aerofoil is created using GAMBIT and CFD analysis is carried out using ANSYS FLUENT. Lift and Drag forces along with the angle of attack are the important parameters in a wind turbine system. These parameters decide the efficiency of the wind turbine. The lift force and drag force acting on aerofoil were determined with various angles of attacks ranging from 0° to 12° and wind speeds. The coefficient of lift and drag values are calculated for 1×105 Reynolds number. The pressure distributions as well as coefficient of lift to coefficient of drag ratio of this aerofoil were visualized. The CFD simulation results show close agreement with those of the experiments, thus suggesting a reliable alternative to experimental method in determining drag and lift.

scholarly journals Deformation properties of self-adapting wind turbine blades numerical approach and optimization

2019 ◽  
Vol 23 (4) ◽  
pp. 2397-2402
Author(s):  
Xiao Chen ◽  
Li Qiu ◽  
Qiang Cen
Keyword(s):  
Power Generation ◽  
Wind Speed ◽  
Turbine Blades ◽  
Numerical Approach ◽  
Wind Turbine Blades ◽  
Wind Speeds ◽  
Mechanics Model ◽  
Deformation Properties ◽  
Glass Carbon ◽  
Flexible Deformation

All wind-driven generators need to be equipped with brakes to ensure operational control and safety. Many methods are available to avoid over-speed of the blower. This paper establishes a mechanics model to investigate each point on turbine blades, which are such designed that they would change shape in high winds to reduce the frontal area through adaptive and flexible deformation. In this way, high wind speeds will cause deformation of the blades and decrease of the rotational speed, as a result the turbine slows down. A numerical analysis of the fluid in the fan housing and a force analysis of the blades are performed, and numerical results are used to design the non-uniform arrangement of the hybrid glass/carbon fiber. A wind tunnel experiment is performed on the new blade design. The experimental results show that the new blade achieves an improvement in its mechanical properties and is able to adaptively adjust the torque. During the operation of the wind-driven generator, the new blade could effectively broaden the operational range of wind speeds, thereby improving the power generation when the wind speed is low. A generator without a brake stalls when the wind speed exceeds 13 m/s. After the adoption of the self-adaptive blade made up of the uniform-section complex textile material, the power set shows reduction of noise, avoidance of blade runaway, improvement of the efficiency of the power generation, decrease of cost and enhancement of blade consistency.

scholarly journals Investigation of the Solidity Ratio in a Horizontal Wind Turbine

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Süleyman Tekşin ◽  
Mert Kurt
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Horizontal Wind ◽  
Speed Ratio ◽  
Horizontal Axis Wind Turbine ◽  
Generator System ◽  
Wind Speeds ◽  
Solidity Ratio ◽  
Different Diameters ◽  
Work Done

A wind turbine-generator system; Parameters such as wind speed, turbine blade diameter, number of blades, turbine height, tip speed ratio and solidity ratio are affected. In this study, horizontal axis wind turbine with diameter of 130 cm and blade solidity ratio values of 7%, 8,6% and 9,8% were constructed and the tests were made according to different blade speed ratios. The required blades were obtained from PVC pipes of different diameters. The experimental study was actualized in Erciyes University Mechanical Engineering, Engines Laboratory. For each profile, blade rotational speeds and wind speeds at various distances have been studied. It has been determined that the wind speed is reduced by the distance difference and accordingly the number of blade speed is decreased visibly. In the wing profiles with different blade solidity ratios resulting from the work done, the wing structure with the solidity ratio of 8.6% gave the best performance. CL and CD coefficients of the profiled specimens were analyzed by FLUENTTM, a program of computational fluid dynamics. One of the factors that should be taken into consideration in the production of wind turbines is the blade solidity ratio.

scholarly journals Parametric study of a horizontal axis wind turbine with similar characteristics to those of the Villonaco wind power plant

2021 ◽  
Vol 2 (2) ◽  
pp. 51
Author(s):  
Santiago Sánchez ◽  
Victor Hidalgo ◽  
Martin Velasco ◽  
Diana Puga ◽  
P. Amparo López-Jiménez ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Energy Production ◽  
Electrical Energy ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Wind Speeds ◽  
Electrical Energy Production ◽  
Python Programming ◽  
Selection Of

<p class="JAREAbstract">The present paper focuses on the selection of parameters that maximize electrical energy production of a horizontal axis wind turbine using Python programming language. The study takes as reference turbines of Villonaco wind field in Ecuador. For this aim, the Blade Element Momentum (BEM) theory was implemented, to define rotor geometry and power curve. Furthermore, wind speeds were analyzed using the Weibull probability distribution and the most probable speed was 10.50 m/s. The results were compared with mean annual energy production of a Villonaco’s wind turbine to validate the model. Turbine height, rated wind speed and rotor radius were the selected parameters to determine the influence in generated energy. Individual increment in rotor radius and rated wind speed cause a significant increase in energy produced. While the increment in turbine’s height reduces energy generated by 0.88%.</p>

A Study on the Fish Pond Oxygenase System Driven by Wind Turbine

2014 ◽  
Vol 875-877 ◽  
pp. 1666-1670
Author(s):  
Zi Jie Chien ◽  
Hung Pin Cho ◽  
Ching Song Jwo ◽  
Sih Li Chen ◽  
Chao Chun Chien ◽  
...  
Keyword(s):  
Wind Speed ◽  
Power Consumption ◽  
Dissolved Oxygen ◽  
Wind Turbine ◽  
Wind Power ◽  
Power Supply ◽  
Reciprocating Compressor ◽  
Oxygen Production ◽  
Horizontal Axis Wind Turbine ◽  
Rotating Speed

This study developed an oxygenase system with horizontal-axis wind turbine driving the oxygenation device by belt pulley for aquaculture, and verified the feasibility of the system in conditions of Taiwan’s average wind speed. The experimental system is consisted of a horizontal wind turbine, a reciprocating compressor, and water channels. At the first stage of the experiment, the reciprocating compressor oxygenase system was measured according to the power supply standards in terms of power consumption, air displacement and oxygen production, in case of various rotating speeds and the compliance with aquaculture standards. At the second stage of the experiment, the wind turbine was used to directly drive the reciprocating compressor oxygenase system. According to the experimental results, regarding the test of the compressor oxygenase system, when power supply rotating speed is 406.7 rpm, power consumption is 234.5 W and the oxygen production is 7.48mg/L, which is above the level of amount of dissolved oxygen of aquaculture at 5.5mg/L. In case of driving the oxygenation device by wind power, when wind speed is 5.06 m/s and the wind turbine rotating speed is 140 rpm, the average dissolved oxygen in the water is 5.9 mg/L, which meets the aquaculture standards. Even in case of unstable wind speed, good oxygen production effects can be achieved. Moreover, the system is directly driven by wind power and does not require electric power.

scholarly journals Survei Penempatan Pembangkit Listrik Tenaga Bayu Di Tanah Laut Berdasarkan Citra Radar Banjarmasin

2019 ◽  
Vol 4 ◽  
pp. 129
Author(s):  
Hanif Kurniadi ◽  
Arifah Dwi Yuliani ◽  
Ismah Atikah Khairunnisa ◽  
Syadza Siskayani Putri ◽  
Eko Wardoyo ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Farm ◽  
Renewable Energy Sources ◽  
Turbine Blades ◽  
Electricity Consumption ◽  
Meteorological Station ◽  
Maximum Height ◽  
Wind Speeds ◽  
Average Wind ◽  
Radar Imagery

<p><strong>Abstract: </strong>Indonesia's electricity consumption has increased every year. One way to overcome this problem is by utilizing renewable energy sources such as wind. Utilization of this energy uses wind turbines installed at locations that have met the requirements. Therefore, information on wind conditions in several layers is required by using radar products such as CAPPI, PPI, and HWIND which are processed using Rainbow 5 software and then interpreted in a daily wind speed graph. Data obtained from radar imagery of Syamsudin Noor Meteorological Station-Banjarmasin. And to determine the boundary conditions of the wind layer is determined according to the length of the turbine blades to calculate the minimum wind speed needed to drive the turbine blades. The results of this study show that wind conditions in layers of 100 to 600 meters tend to be the same, making it difficult to determine the maximum height of the wind layer and from 7 days of the observation sample, it is found that some average wind speeds per day are 4.076923 m / s, 4.777778 m / s, 4.393939 m / s, 0.75 m / s, 0.72973 m / s, 3.678571 m / s, and 1.4375 m / s, which are known to have not met the minimum wind speed requirements for wind farm (PLTB) to produce optimal energy.</p><p><strong>Abstrak: </strong>Konsumsi listrik Indonesia mengalami peningkatan setiap tahunnya. Salah satu untuk mengatasi masalah tersebut dengan memanfaatkan sumber energi terbarukan seperti angin. Pemanfaatan energi ini menggunakan turbin angin yang dipasang pada lokasi yang telah memenuhi syarat. Karena itu, diperlukan informasi kondisi angin dibeberapa lapisan dengan menggunakan produk radar seperti CAPPI, PPI, dan HWIND yang diolah menggunakan perangkat lunak Rainbow 5 lalu diintrepretasikan dalam grafik kecepatan angin harian. Data diperoleh dari citra radar Stasiun Meteorologi Kelas II Syamsudin Noor-Banjarmasin. Dan untuk menentukan kondisi batas lapisan angin ditentukan sesuai panjang dari baling-baling turbin untuk memperhitungkan kecepatan angin minimal yang diperlukan untuk menggerakkan baling-baling turbin. Hasil penelitian ini memperlihatkan kondisi angin di lapisan 100 hingga 600 meter cenderung sama, sehingga sulit untuk menentukan ketinggian lapisan angin maksimum dan dari 7 hari sebagai sampel pengamatan didapatkan beberapa kecepatan angin rata-rata perhari antara lain 4.076923 m/s,  4.777778 m/s,  4.393939 m/s, 0,75 m/s, 0.72973 m/s, 3.678571 m/s, dan 1.4375 m/s yang diketahui belum memenuhi persyaratan kecepatan angin minimum yang diperlukan Pembangkit Listrik Tenaga Bayu (PLTB) untuk menghasilkan energi yang optimal.</p>

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