Design of a low Reynolds number airfoil for small horizontal axis wind turbines

Singh, Ronit K.; Ahmed, M. Rafiuddin; Zullah, M. Asid; Lee, Young‐Ho

doi:10.1016/j.renene.2011.09.014

Cited by 147 publications

(90 citation statements)

References 16 publications

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“…For a NACA 23012 airfoil, deep stall starts at an angle of attack of 21 degrees. During the condition of deep stall, the lift produced by the turbine blade is low, and the consequent drag polar is irregular, with a high in-situ drag [10]. This loss of lift requires a greater starting torque.…”

Section: Deep Stall and High Incidencementioning

confidence: 99%

Design and Optimisation of a Low Reynolds Number Airfoil for Small Horizontal Axis Wind Turbines

Radhakrishnan

Suri

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Section: Deep Stall and High Incidencementioning

confidence: 99%

Design and Optimisation of a Low Reynolds Number Airfoil for Small Horizontal Axis Wind Turbines

Radhakrishnan

Suri

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…With the progress of interest in wind energy sector, some dedicated airfoils have been introduced for the wind turbine. However, for the small scale wind turbine, the airfoil should be used at a low angle of attack, where the coefficient of drag is much lower as compared to the lift coefficient [7]. The selection of appropriate airfoils depends on the aerodynamic behavior and operating conditions which are related to Reynold number.…”

Section: Wind Turbine Blade Designmentioning

confidence: 99%

Theoretical Analysis of Ignition in Diesel Engines

Alshahrani¹

2017

JPEE

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The present work is based on the comparative study between "Blade-ElementMomentum" (BEM) analysis and "Computational-Fluid-Dynamics" (CFD) analysis of small-scale horizontal axis wind turbine blade. In this study, the pitch is considered as fixed and rotor speed is variable. Firstly, the aerodynamic characteristics of three different specialized airfoils were analyzed to get optimum design parameters of wind turbine blade. Then BEM was performed with the application of the open source wind turbine design and performance computation software Q-Blade v0.6. After that, CFD simulation was done by Ansys CFX software. Here, k-ω "Shear-Stress-Transport" (SST) model was conducted for three-dimensional visualization of turbine performance. However, the best coefficient of performance was observed at 6˚ angle of attack. At this angle of attack, in the case of BEM, the highest coefficient of performance was 0.47 whereby CFD analysis, it was 0.43. Both studies showed good performance prediction which was a positive step to accelerate the continuous revolution in wind energy sector.

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“…Thus, the averaged torque T ave during the time interval [t 0 , t n ] is calculated by (17) where t 0 represents the time at the beginning of a single rotation of the rotor and t n is the time at the end of a single rotation.…”

Section: Cfd Approach For Aerodynamic Simulationmentioning

confidence: 99%

“…Thus, using a power coefficient at fixed tip speed ratio to assess rotor aerodynamic performance at variable tip speed ratios is confusing and an attempt to develop a new aerodynamic performance evaluation indicator should be made. On another aspect, CFD method coupled with optimization algorithm has been routinely applied in wind turbine airfoil design [16,17]. It should not be neglected that the CFD calculation, though having relatively accurate prediction results compared to other aerodynamic calculating tools, tends to be time consuming when the study object is H type VAWT characterized with complex flow field.…”

Section: Introductionmentioning

confidence: 99%

Airfoil Design for Vertical Axis Wind Turbine Operating at Variable Tip Speed Ratios

Yi¹,

Qu²,

Li³

2015

TOMEJ

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Abstract:A new airfoil design method for H type vertical axis wind turbine is introduced in the present study. A novel indicator is defined to evaluate vertical axis wind turbine aerodynamic performance at variable tip speed ratios and selected as the airfoil design objective. A mathematic model describing the relationship between airfoil design variables and objective is presented for direct airfoil design on the basis of regression design theory. The aerodynamic performance simulation is conducted by computational fluid dynamics approach validated by a wind tunnel test in the study. Based on the newly developed mathematic model, a new airfoil is designed for a given wind turbine model under constant wind speed of 8 m/s. Meanwhile, the comparison of aerodynamic performance for newly designed airfoil and existing vertical axis wind turbine airfoils is studied. It has been demonstrated that, by the novel indicator, the rotor aerodynamic performance at variable tip speed ratios with the newly designed airfoil is 6.78% higher than the one with NACA0015 which is the airfoil widely used in commercial H type vertical axis wind turbine.

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Design of a low Reynolds number airfoil for small horizontal axis wind turbines

Cited by 147 publications

References 16 publications

Design and Optimisation of a Low Reynolds Number Airfoil for Small Horizontal Axis Wind Turbines

Design and Optimisation of a Low Reynolds Number Airfoil for Small Horizontal Axis Wind Turbines

Theoretical Analysis of Ignition in Diesel Engines

Airfoil Design for Vertical Axis Wind Turbine Operating at Variable Tip Speed Ratios

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