Small Wind Turbine Technology

Probst, Oliver; Martínez, Jorge L.; Elizondo, Jorge; Monroy, Oswaldo

doi:10.5772/15861

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…Small wind turbines (SWTs) with power ratings typically below 50 kW are a renewable energy source that can be used in locations where conventional large wind turbines are not feasible [9]. Typical applications of SWTs are in the electrification of rural or remote areas [10], as hybrid systems in combination with other energy sources, such as solar radiation or hydrogen [11], or in microgeneration to reduce carbon emissions [12]. Icing on SWTs has similar effects to icing on larger wind turbines, although due to their smaller size and different designs, the sensitivity to icing can be increased [13,14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers

et al. 2020

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Most icing research focuses on the high Reynolds number regime and manned aviation. Information on icing at low Reynolds numbers, as it is encountered by wind turbines and unmanned aerial vehicles, is less available, and few experimental datasets exist that can be used for validation of numerical tools. This study investigated the aerodynamic performance degradation on an S826 airfoil with 3D-printed ice shapes at Reynolds numbers Re = 2 × 105, 4 × 105, and 6 × 105. Three ice geometries were obtained from icing wind tunnel experiments, and an additional three geometries were generated with LEWICE. Experimental measurements of lift, drag, and pressure on the clean and iced airfoils have been conducted in the low-speed wind tunnel at the Norwegian University of Science and Technology. The results showed that the icing performance penalty correlated to the complexity of the ice geometry. The experimental data were compared to computational fluid dynamics (CFD) simulations with the RANS solver FENSAP. Simulations were performed with two turbulence models (Spalart Allmaras and Menter’s k-ω SST). The simulation data showed good fidelity for the clean and streamlined icing cases but had limitations for complex ice shapes and stall.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers

et al. 2020

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“…The blades have been investigated at wind speed ranges from 1 m/s to 7 m/s, rotational-speed ranges from 138 rpm to 500 rpm, and Pitch ranges from 0-10 degrees. The chord distribution is optimized further, according to Betz [37]:…”

Section: • Selection Of the Airfoilsmentioning

confidence: 99%

Small Wind Turbine Blade Design and Optimization

2019

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This work aims at designing and optimizing the performance of a small Horizontal-Axis-Wind-Turbine to obtain a power coefficient (C P ) higher than 40% at a low wind speed of 5 m/s. Two symmetric in shape airfoils were used to get the final optimized airfoil. The main objective is to optimize the blade parameters that influence the design of the blade since the small turbines are prone to show low performance due to the low Reynolds number as a result of the small size of the rotor and the low wind speed. Therefore, the optimization process will select different airfoils and extract their performance at the design conditions to find the best sections which form the optimal design of the blade. The sections of the blade in the final version mainly consist of two different sections belong to S1210 and S1223 airfoils. The optimization process goes further by investigating the performance of the final design, and it employs the blade element momentum theory to enhance the design. Finally, the rotor-design was obtained, which consists of three blades with a diameter of 4 m, a hub of 20 cm radius, a tip-speed ratio of 6.5 and can obtain about 650 W with a Power coefficient of 0.445 at a wind-speed of 5.5 m/s, reaching a power of 1.18 kW and a power coefficient of 0.40 at a wind-speed of 7 m/s.

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“…A small wind turbine generally consists of the following components: A rotor with a variable number of blades for convert the power from wind to mechanical power, an electric generator, control and protection mechanisms, and power electronic components for feeding electricity into a battery bank, the public grid or, occasionally, into a direct application such as a water-pump [1,13].…”

Section: Small-scale Wind Turbine Systemmentioning

confidence: 99%

“…As described above, the electric generators of modern small wind turbines are generally designed to use permanent magnets and a direct coupling between rotor and generator. The following common topologies can be encountered: In the topologies above the type of flow refers to the direction of the magnetic flow lines crossing the magnetic gap between the poles with respect to the rotating shaft of the generator [13].…”

Section: Small-scale Wind Turbine Systemmentioning

confidence: 99%