Comparative study of the performances of a bio-inspired flexible-bladed wind turbine and a rigid-bladed wind turbine in centimeter-scale

Chu, Yung-Jeh; Lam, Heung-Fai

doi:10.1016/j.energy.2020.118835

Cited by 16 publications

(7 citation statements)

References 21 publications

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“…Finally, micro-scale wind turbines, with a diameter of the rotor lower than 200 mm, exhibit lower C p in the range 0.05 ≤ C p ≤ 0.15 and operate at very low tip-speed ratio 0 ≤ λ ≤ 2 [19][20][21][22][23][24]. At micro-scale, no author applied the classical blade-element/ momentum theory to design an optimum rotor and analyze their wind turbines.…”

Section: Introductionmentioning

confidence: 99%

Innovative design method and experimental investigation of a small-scale and very low tip-speed ratio wind turbine

Bourhis

Pereira

Ravelet

et al. 2022

Experimental Thermal and Fluid Science

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Small horizontal axis wind turbines operating at low wind speeds face the issue of low performance compared to large wind turbines. A high amount of torque is required to start producing power at low wind speed to overtake friction of mechanical parts. A low design tip-speed ratio (λ) is suitable for low power applications. The relevance of the classical blade-element/ momentum theory, traditionally used for the design of large wind turbines operating at high tip-speed ratio, is controversial at low tip-speed ratio. This paper presents a new design methodology for a 300 mm horizontal axis wind turbine operating at very low tip-speed ratio. Chord and blade angle distributions were computed by applying the Euler's turbomachinery theorem. The new wind turbine has multiple fan-type blades and a high solidity. The rotor was tested in wind tunnel. The power and torque coefficients have been measured, and the velocities in the wake have been explored by stereoscopic particle image velocimetry. The results are compared to a conventional 3-bladed horizontal axis wind turbine operating at higher tip-speed ratio λ = 3. The new wind turbine achieves a maximum power coefficient of 0.31 for λ = 1. The conventional wind turbine achieves similar performance. At low tip-speed ratio, the torque coefficient (C τ ) is higher for the new wind turbine than for the conventional one and decreases linearly with the tip-speed ratio. The high magnitude of torque at low tip-speed ratio allows it to have lower instantaneous cut-in wind speed (2.4 m.s −1 ) than the conventional wind turbine (7.9 m.s −1 ). The order of magnitude of the axial and tangential velocities in the near wake are closed to the design requirements. The current method could still be improved in order to better predict the profiles. The analysis of the wake shows that the new wind turbine induces a highly stable and rotating wake, with lower wake expansion and deceleration than the conventional one. This could be usefull to drive a contra-rotating rotor.

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Section: Introductionmentioning

confidence: 99%

Innovative design method and experimental investigation of a small-scale and very low tip-speed ratio wind turbine

Bourhis

Pereira

Ravelet

et al. 2022

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

show abstract

“…where P rated is the rated power at the rated wind speed v rated , ρ is the air density, and R is the wind turbine's rotor radius. Another variable to be calculated is the tip speed ratio TSR rated , which is defined as the ratio between the tangential speed at the tip of the blade V t and the rated wind speed; therefore, the rated value is given by [13], [31]: being V t =ΩR, where Ω is the nominal rotational speed. The wind resource of a particular site is approached by the Weibull distribution W(u ∞ ), given by [32]:…”

Section: Technical Formulationmentioning

confidence: 99%

“…In this sense, if the wind energy resource of the country is exploited for electricity generation, the country's energy sustainability goals could be achieved [12]. Specifically, the Small Wind Turbines (SWTs) potential market could be cost-efficient indicators in their operation [13]. In 2015, 990000 SWTs were installed worldwide, that is, a growth of 5 % compared to 2014; this means an installed capacity of 984 GW, 14 % higher than in the previous year [14].…”

Section: Introductionmentioning

confidence: 99%

Techno-economic assessment of small wind turbines under la Guajira-Colombia resource conditions

Jaramillo-Cardona

Perafán-López

Torres-Madroñero

et al. 2022

CT&F Cienc. Tecnol. Futuro

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Hydroelectric plants broadly sustain Colombian electricity demand. However, wind power emerges to improve the Colombian energy matrix and capacity, satisfying the energy demand. Thus, this study evaluates the technical and economic feasibility of projects based on Small Wind Turbines (SWTs), based on the Colombian wind resource availability. Furthermore, due to the Colombian diversity of energy sources, sensitivity to climate changes and a high percentage of non-interconnected territory, the SWTs excels as an off-grid energy system alternative. For this purpose, the annual energy production and the capacity factor of 24 SWT and the wind resource in Puerto Bolívar, La Guajira, are considered. A techno-economic study that includes cash flow analysis and net present value is used to determine economic viability, considering a financing percentage sensitivity analysis. From the results, it can be concluded that an SWT based project increases its profitability by increasing the IRR value and lowering the financing percentage. Further, the best SWT models can be related to a higher capacity factor value based on the economic phase.

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“…A comparative study was conducted on a bio-inspired flexible centrifugal rotor blade design for a small wind turbine, proposing it as the preferred option over rigid rotor blade systems. This comparative study provided valuable attention to the design, fabrication and testing of microcapacity wind turbines, as the previous studies prior to this review had been based on rigid blade systems [14]. The case study on the electrification of small villages in Ethiopia for small-capacity wind turbines addressed the new application of micro-to-small-size wind turbines [15].…”

Section: Introductionmentioning

confidence: 99%

Development of a roof-mounted stand-alone wind turbine system for house-hold power generation

Surve,

Deshmukh,

Kale

et al. 2023

Eng. Res. Express

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In recent years, the development of sustainable energy sources has attracted increasing interest due to worries about the environmental effects of greenhouse gas emissions. Renewable energy and technology may provide a solution to the persistent environmental issues that developing nations are currently experiencing. In this work, it has been demonstrated that the design, analysis, and implementation of the newly developed small roof-mounted stand-alone wind turbine systems for household energy production. It is specially designed for sites with low altitudes (12 m above ground) and low wind speeds (range of 1–12 m s−1). The wind turbine system involves the mechanical design of the 3-blade rotor and its installation on a micro-capacity and self-contained 325 W wind turbine. The experimental analysis reveals that the peak power coefficient (CP) is quite good, about 0.13, and the output power is 43.75 W. The comparative analysis is also done to validate that the results are consistent with micro-capacity systems that have been tested under similar conditions. This work provides insight into the development of roof-mounted stand-alone wind turbine systems, which have a lot of potential for green applications and to make up for people who don’t have access to electricity.

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Comparative study of the performances of a bio-inspired flexible-bladed wind turbine and a rigid-bladed wind turbine in centimeter-scale

Cited by 16 publications

References 21 publications

Innovative design method and experimental investigation of a small-scale and very low tip-speed ratio wind turbine

Innovative design method and experimental investigation of a small-scale and very low tip-speed ratio wind turbine

Techno-economic assessment of small wind turbines under la Guajira-Colombia resource conditions

Development of a roof-mounted stand-alone wind turbine system for house-hold power generation

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