scholarly journals Effects of setting angle and chord length on performance of four blades bionic wind turbine

2017 ◽  
Vol 93 ◽  
pp. 012041 ◽  
Author(s):  
Z X Yang ◽  
G S Li ◽  
L Song ◽  
Y F Bai
Keyword(s):  
Wind Turbine ◽  
Chord Length ◽  
Setting Angle

Numerical Research on the Characteristics of Lift-Drag Type Vertical Axis Wind Turbine

2012 ◽  
Vol 189 ◽  
pp. 448-452
Author(s):  
Yan Jun Chen ◽  
Guo Qing Wu ◽  
Yang Cao ◽  
Dian Gui Huang ◽  
Qin Wang ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Chord Length ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Vertical Axis Wind Turbine ◽  
Tip Speed Ratio ◽  
Middle Range ◽  
Parabolic Form ◽  
Cfd Method

Numerical studies are conducted to research the performance of a kind of lift-drag type vertical axis wind turbine (VAWT) affected by solidity with the CFD method. Moving mesh technique is used to construct the model. The Spalart-Allmaras one equation turbulent model and the implicit coupled algorithm based on pressure are selected to solve the transient equations. In this research, how the tip speed ratio and the solidity of blade affect the power coefficient (Cp) of the small H-VAWT is analyzed. The results indicate that Cp curves exhibit approximate parabolic form with its maximum in the middle range of tip speed ratio. The two-blade wind turbine has the lowest Cp while the three-blade one is more powerful and the four-blade one brings the highest power. With the certain number of blades, there is a best chord length, and too long or too short chord length may reduce the Cp.

Development of the Third Darrieus Blade of Sultan Wind Turbine for Low Wind Speed

2015 ◽  
Vol 758 ◽  
pp. 13-19 ◽  
Author(s):  
Erwin ◽  
Slamet Wiyono ◽  
Erny Listijorini ◽  
Rina Lusiani ◽  
Tresna P. Soemardi
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Angle Of Attack ◽  
Optimum Combination ◽  
Chord Length ◽  
The Third ◽  
Low Wind Speed ◽  
A Value ◽  
Power Turbine ◽  
Naca 0012

Use of NACA 0012 at the Sultan Wind Turbine prototype provide value coefficient power turbine at wind speed 5.5 m / s by 0017 , wind speed 6.1 m / s at 0.015 , wind speed 7.7 m / s at 0.016 , wind speed 6.5 m / s for 0018 and wind speed 6.2 m / s by 0017 . Where the value of the highest efficiency obtained at a speed of 6.5 m / s at 0.018 . This result is not as expected to generate sufficient energy.The next development carried out investigations on some kind of airfoil, from investigations obtained by using Qblade software that NACA 6612 has a value of 1.78 CL at 15 degrees angle of attack is the largest of all the airfoil .In this research, NACA 6612 will be simulated with a variable chord length, angle of attack, and wind speed, of these three variables will be created which will map graphics 3d sliding value of the ratio of the 3 variables, this graph will give recommendations most optimum combination of variables to types are mapped wind speed throughout the year, to produce optimum power.Optimum combination of NACA 6612 with wind speed varied from 2-7 m/s is chord length 30 cm and angle of attack 7 degree.

A Preliminary Study on Small Thermoplastic Composite Wind Turbine Blade Design and Fabrication

2015 ◽  
Author(s):  
Juan Garate ◽  
Stephen A. Solovitz ◽  
Dave Kim
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Large Scale ◽  
Chord Length ◽  
Wind Turbine Blade ◽  
Thermoplastic Composite ◽  
Horizontal Axis Wind Turbine ◽  
Limit Condition ◽  
Glass Fiber Reinforced ◽  
Turbine Blade Design

Today a large-scale wind turbine blade can be 70 m long and 5 m in root chord length, and it is fabricated in a single piece. This feature leads to high initial costs, as transportation of a large blade requires special trucks, escorts, and road adaptations. These constraints can account for approximately 6–7% of the total investment for the blade. In addition, the manufacturing process commonly used is a hand lay-up configuration of thermoset composite sheets. These materials are not reusable after fabrication, which is a non-renewable feature of existing systems. The project consists of manufacturing thermoplastic composite blades in segments, which are joined before installation at the turbine site. This paper addresses the preliminary research results when conducting design and fabrication of a small blade with this innovative approach. Three segmented blades are manufactured for a horizontal-axis wind turbine, with each blade having a 50 cm span and a 4 cm tip chord length. The blade size and profile are designed based on the idealized Betz limit condition. The material used for manufacturing is a glass fiber reinforced thermoplastic composite system with a polypropylene matrix that melts at 200 °C. Each blade is fabricated in 4 independently manufactured pieces, consisting of top/bottom, and tip/root segments, via a vacuum assisted thermoforming technique. The parts will be assembled afterwards by a joining process, forming the final part for site testing.

scholarly journals Influence of Wing Section and Wing Setting Angle on the Starting Performance of a Darrieus Wind Turbine with Straight Wings

2011 ◽  
Vol 6 (2) ◽  
pp. 302-315 ◽  
Author(s):  
Futoshi TANAKA ◽  
Kiyoshi KAWAGUCHI ◽  
Shinichi SUGIMOTO ◽  
Masahiro TOMIOKA
Keyword(s):  
Wind Turbine ◽  
Wing Section ◽  
Setting Angle

Investigation on Unstable Pressure Distribution of an Axial Fan Blade with Difference of Setting Angle and Chord Length

2020 ◽  
Vol 13 (2) ◽  
pp. 336-347 ◽  
Author(s):  
Yong-In Kim ◽  
Seul-Gi Lee ◽  
Sang-Yeol Lee ◽  
Hyeon-Mo Yang ◽  
Sung Kim ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
Chord Length ◽  
Axial Fan ◽  
Setting Angle ◽  
Fan Blade

A Differential Evolution-Based Inverse Method to Optimize Blade Configurations in Elliptical-Bladed Savonius Wind Turbines

2019 ◽  
Author(s):  
Nur Alom ◽  
Ranjan Das ◽  
Ujjwal K. Saha
Keyword(s):  
Aspect Ratio ◽  
Differential Evolution ◽  
Wind Turbine ◽  
Objective Function ◽  
Wind Turbines ◽  
Search Algorithm ◽  
Chord Length ◽  
Operating Conditions ◽  
Design Variables ◽  
Overlap Ratio

Abstract It is well-known that elliptical-bladed Savonius wind turbine yields relatively better performance than conventionally used semicircular-bladed turbines. This is mainly due to lesser tip loss and delayed flow separation that allow the elliptical turbine to acquire higher rotational speeds than semicircular turbine under a given wind load. In this work, an experimentally-validated inverse analysis is done to determine the optimum blade configurations involving the chord length, turbine height, aspect ratio, and the necessary overlap ratio to derive a required power and torque from elliptical-bladed Savonius wind turbines. Due to obvious advantages of evolutionary metaheuristic optimizers in general, here differential evolution (DE) search algorithm is used to solve the inverse problem through a least-squares minimization of the relevant objective function. The objective function is further subjected to feasible bounds of the unknown design variables. The effects of blockage corrections are duly considered and the variations of the design variables along with the objective function are studied over a range of iterations of the DE algorithm. Through comprehensive analysis, it is highlighted from the present study that for harvesting a given performance, rotor swept area can be reduced by 6.25% with respect to the available experimental data under identical operating conditions of the wind turbine. Multiple blade configurations can be acquired, all of which invariably satisfy the required performance criterion. This study also highlights that amongst various dimensional parameters, turbine height and aspect ratio play more prominent role than chord length and overlap ratio and the blade chord influences only the torque but not markedly the power. The results obtained from the present work are proposed to facilitate the concerned designer to explore various feasible blade designs and determine the suitable one, thereby avoiding valuable time elapsed in repetitive fabrication and testing of various designs.

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