An innovative variable shroud for micro wind turbines

Siavash, Nemat Keramat; Najafi, Gholamhassan; Hashjin, T. Tavakkoli; Ghobadian, Barat; Mahmoodi, Esmail

doi:10.1016/j.renene.2019.06.098

Cited by 29 publications

(10 citation statements)

References 20 publications

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“…Computational fluid dynamics analysis of shrouded wind turbine, presented in [6], show a considerable increase of the power coefficient compared to unshrouded turbine. According to [7], the use of semi-opened duct in higher ranges of wind speed can exceed the conventional shrouds in power and rotor speeds. The optimization procedure, based on classical blade element theory, for design of the blades of a diffuser-augmented wind turbine is presented in [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Barbarić

Guzović

2020

Energies

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Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements are investigated. Firstly, optimization-based design of rotor blade is used to get as close as possible to the efficiency limit of 59.3% (known as Betz limit), that counts for bare turbine rotors, placed in the free flow. Additional diffuser elements are further added to examine the potential to overcome the theoretical efficiency limit by accelerating water at the axial direction. Various diffuser geometrical configurations are investigated using the computational fluid dynamics (CFD) to obtain insight into hydrodynamics of augmented micro-hydrokinetic turbines. Moreover, the turbines are compared from the energy conversion efficiency point of view. The highest maximum power coefficient increase of 81% is obtained with brimmed (flanged) diffuser. Diffusers with foil-shaped cross-sections have also been analyzed but power augmentation is not significantly greater than in the case of simple cross-section designs of the same dimensions. The power coefficients’ comparison indicate that considerable power augmentation is achievable using brimmed diffuser with higher value of length-to-diameter ratio. However, the impact of diffuser length increase on the power coefficient enhancement becomes weaker as the length-to-diameter ratio reaches a value of 1.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Barbarić

Guzović

2020

Energies

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“…In addition to measuring wind speed, measurement of wind energy output is also carried out using a vertical axis wind turbine (VAWT) with three blades at the same time. This turbine is equipped with a 300-watt DC generator which is then connected to a power measuring device, namely a digital watt meter [32,33]. his measurement is taken in two places, namely on the median of the road as wind data that utilizes traffic flow and on open yards around the road as atmospheric wind data.…”

Section: Solar and Wind Datamentioning

confidence: 99%

An Investigation of Hybrid Renewable Energy Potential by Harnessing Traffic Flow

Pamuttu¹,

Akbar²,

Andika³

et al. 2023

IJHT

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The potential for hybrid combinations using solar and wind energy can be found in several places, one of which is on the highway. Highways are open areas exposed to direct sunlight and wind can blow forming natural wind tunnels. In addition, vehicles that pass on the road also generate wind which can then be used as an energy source. The purpose of this study is to find out how significant the potential for hybrid energy is by utilizing a combination of solar energy and wind energy obtained from utilizing traffic flow. The method used in this study is an experimental method by testing how much energy is obtained from sunlight by using a solar cell 50 Wp and wind energy by using a technological innovation Veritkal Axis Wind Turbine (VAWTs) 300 watts as a producer of electric power on the highway by utilizing two types of wind at once, namely atmospheric scale wind that blows naturally and wind from vehicle traffic on the highway. Current, voltage, and power measurements are then measured using a digital watt meter. The study's results found that the combined potential of solar energy and wind energy obtained from utilizing traffic flow was 552.11 watts, greater than just using a naturally blowing engine with a power of only 498.67 watts. This energy difference occurs due to an increase in wind frequency generated by traffic flow by 22%.

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“…An electrohydraulic actuator is controlled by the proposed fuzzy feedforward PID controller that achieved a performance index of 0.08606, 0.08849, and 0.09809 with normal leakage, high leakage, and very high leakage, respectively. Siavash et al [138] reported a study where a small wind turbine was equipped with a controllable nozzle-diffuser duct that surrounds the rotor; the mechanism controls the speed of the flow and the drag forces acting on the turbine structure. The duct consists of a fixed ring and a diffuser which can rotate on each other.…”

Section: Control Systems Approachesmentioning

confidence: 99%

Technological and Operational Aspects That Limit Small Wind Turbines Performance

et al. 2020

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Small Wind Turbines (SWTs) are promissory for distributed generation using renewable energy sources; however, their deployment in a broad sense requires to address topics related to their cost-efficiency. This paper aims to survey recent developments about SWTs holistically, focusing on multidisciplinary aspects such as wind resource assessment, rotor aerodynamics, rotor manufacturing, control systems, and hybrid micro-grid integration. Wind resource produces inputs for the rotor’s aerodynamic design that, in turn, defines a blade shape that needs to be achieved by a manufacturing technique while ensuring structural integrity. A control system may account for the rotor’s aerodynamic performance interacting with an ever-varying wind resource. At the end, the concept of integration with other renewable source is justified, according to the inherent variability of wind generation. Several commercially available SWTs are compared to study how some of the previously mentioned aspects impact performance and Cost of Electricity (CoE). Understanding these topics in the whole view may permit to identify both tendencies and unexplored topics to continue expanding SWTs market.

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An innovative variable shroud for micro wind turbines

Cited by 29 publications

References 20 publications

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

An Investigation of Hybrid Renewable Energy Potential by Harnessing Traffic Flow

Technological and Operational Aspects That Limit Small Wind Turbines Performance

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