Effects of Wind Turbine Starting Capability on Energy Yield

Worasinchai, Supakit; Ingram, Grant; Dominy, Robert

doi:10.1115/1.4004741

Cited by 19 publications

(8 citation statements)

References 12 publications

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“…The effect of wind turbine starting capability on overall energy yield was investigated in [22]. For certain cases, when the improved self-starting design was implemented, a decline in the overall energy generation was observed.…”

Section: Performance Of Lift-driven Vawtsmentioning

confidence: 99%

Improvement of Self-Starting Capabilities of Vertical Axis Wind Turbines with New Design of Turbine Blades

2021

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A lift-driven vertical axis wind turbine (VAWT) generates peak power when it is rotating at high tip-speed ratios (TSR), at which time the blades encounter angles of attack (AOA) over a small range from zero to 30 degrees. However, its ability to self-start is dependent upon its performance at low TSRs, at which time the blades encounter a range of AOAs from zero to 180 degrees. A novel vented aerofoil is presented with the intention of improving the performance of a lift-driven VAWT at low TSRs without hampering the performance of the wind turbine at high TSRs. Computational fluid dynamics (CFD) simulation is used to predict the aerodynamic characteristics of a new vented aerofoil based on the well documented NACA0012 profile. Simulations are performed using the SST turbulence model. The results obtained show a reduction in the coefficient of tangential force (the force that generates torque on the wind turbine) at low AOAs (less than 90 degrees) of no more than 30%, while at high AOAs (more than 90 degrees) an improvement in the tangential force of over 100% is observed. Using a simple momentum based performance prediction model, these results suggest that this would lead to an increase in torque generation by a theoretical three-bladed VAWT of up to 20% at low TSRs and a minor reduction in coefficient of performance of up to 9% at TSR of 2 and closer to 1% at higher TSRs.

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Section: Performance Of Lift-driven Vawtsmentioning

confidence: 99%

Improvement of Self-Starting Capabilities of Vertical Axis Wind Turbines with New Design of Turbine Blades

2021

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“…However according to Worasinchai et al [57] using a much more simpler modified blade element theory (BET) as the aerodynamic prediction model is also proved to be accurate to capture the measured starting performance character. In ref [57] conventional blade element momentum analysis were modified to assume no flow deceleration though the blade, and the net torque on the rotor equated to the product of rotational moment of inertia and angular acceleration. A standard 4th order Runge-Kutta method were used to determine the angular velocity as a function of time.…”

Section: Fig 6 Velocity Triangle For a Section Of A Blade And The Lomentioning

confidence: 99%

Aerodynamic shape optimization of non-straight small wind turbine blades

Shen

Yang

Chen

et al. 2016

Energy Conversion and Management

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Small wind turbines usually operate in sub-optimal wind conditions in order to satisfy the demand where it is needed. The aerodynamic performance of small horizontal axis wind turbines highly depends on the geometry. In the present study, the geometry of wind turbine blades are optimized not only in terms of the distribution of the chord and twist angle but also with 3-dimensional stacking line. As the blade with 3-dimensional stacking line is given sweep in the plan of rotation and dihedral in the plan containing the blade and rotor axis, the common used blade element momentum method can no longer provide accurate aerodynamic performance solution. A lifting surface method with free wake model is used as the aerodynamic model in the present work. The annual energy production and the starting performance are selected as optimization objective. The starting performance is evaluated based on blade element method. The optimization of the geometry of the non-straight wind turbine blades is carried out by using a micro-genetic algorithm. Results show that the wind turbine blades with properly designed 3-dimensional stacking line can increase the annual energy production and have a better starting behavior compared with 2-dimensional-optimized blade geometries.

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“…With low wind speed and small blade size, the wind flow operates at low Re that is dominated by drag, only to lower the wind turbine power coefficient, CP [9][10][11]. Again, 88 with low wind speed, the start-up difficulties of the wind turbine need to be addressed in order to increase the annual energy production (AEP) [12]. Furthermore, the blade needs to be designed without most of the control systems available in its large counterpart in order to reduce cost.…”

Section: Introductionmentioning

confidence: 99%

The Aerodynamic Performance of the Small-Scale Wind Turbine Blade with NACA0012 Airfoil

Roslan

Rasid

Ehsan

2022

CFDL

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Small-scale wind turbine (SSWT) has been the subject of intensive research to complement its large-scale counterpart especially for usage in low wind speed regions. Two important issues that plague the development of the SSWT are its low in power coefficient especially due to the low Reynold’s number () condition that it’s operating in and the start-up difficulty that it faces. In this paper, the blade element momentum theory (BEMT) has been used to analyse a small-scale wind turbine having 3 m diameter. The airfoil used is the NACA 0012. The simplified experimental based equations have been used to determine the coefficient of lift, and coefficient of drag, of the airfoil. A developed MATLAB’s code applying the basic BEMT method is used. The results of aerodynamic performances including power coefficient, power and thrust are given as a function of wind speed, tip speed ratio (TSR) and Reynold’s number. It shows that at the minimum wind speed of 3 m/s, the wind turbine can have power coefficient of 43% but to produce 600 W of power that is required for total needs of electrical consumption of a household, the wind speed needed is 5m/s which is reachable for low wind speed region.

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Effects of Wind Turbine Starting Capability on Energy Yield

Cited by 19 publications

References 12 publications

Improvement of Self-Starting Capabilities of Vertical Axis Wind Turbines with New Design of Turbine Blades

Improvement of Self-Starting Capabilities of Vertical Axis Wind Turbines with New Design of Turbine Blades

Aerodynamic shape optimization of non-straight small wind turbine blades

The Aerodynamic Performance of the Small-Scale Wind Turbine Blade with NACA0012 Airfoil

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