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Technical Brief

Application of the Blade Element Momentum Theory to Design Horizontal Axis Wind Turbine Blades

[+] Author and Article Information
Vincent Dehouck, Mohamed Lateb, Jonathan Sacheau

Department of Mechanical Engineering,
Université de Sherbrooke,
2500 blvd. de l'Université,
Sherbrooke, QC J1K 2R1, Canada

Hachimi Fellouah

Department of Mechanical Engineering,
Université de Sherbrooke,
2500 blvd. de l'Université,
Sherbrooke, QC J1K 2R1, Canada
e-mail: Hachimi.Fellouah@USherbrooke.ca

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received March 11, 2016; final manuscript received September 1, 2017; published online October 17, 2017. Assoc. Editor: Douglas Cairns.

J. Sol. Energy Eng 140(1), 014501 (Oct 17, 2017) (9 pages) Paper No: SOL-16-1124; doi: 10.1115/1.4038046 History: Received March 11, 2016; Revised September 01, 2017

Small horizontal axis wind turbines (HAWTs) are increasingly used as source of energy production. Based on this observation, the blade element momentum theory (BEMT) is applied all along the blade span to calculate the optimal turbine aerodynamic performances. The main objective is to optimize the HAWT blade profile for specific initial conditions. The effects of three geometric parameters (the blade tip radius, the number of blades, and curvature) and one dynamic parameter (the tip speed ratio (TSR)) are determined for an upstream air speed of 7 m/s. A new empirical relation for the chord distribution over the blade span is presented here; c(r)/R=c0+A[1+r/R]exp(Br/R), where c0 = 0.04 is the chord offset, A = 1/Z is an amplitude, and B = [(Z/5) + 2] is the decay constant. It takes into account both the effect of blade tip radius and the number of the blades.

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References

Figures

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Fig. 1

Geometry for the rotor analysis: (a) actuator disk and (b) fluid stream tube

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Fig. 2

Forces acting on the blade element

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Fig. 3

Blade element momentum theory program flowchart

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Fig. 4

Global program flowchart for the optimization procedure

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Fig. 5

Curves of the normalized blade chord at TSR = 5. Effect of (a) the blade radius and (b) the blade number.

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Fig. 6

Curves of the blade twist angle along the blade radius

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Fig. 7

Curves of the turbine blade power coefficient at different TSR

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