Effect of twist angle on starting capability of a Savonius rotor – CFD analysis

Zakaria, Ahmad; Ibrahim, Mohd Shahrul Nizam

doi:10.1088/1757-899x/715/1/012014

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…The maximum power coefficient value reaches to 0.142 at tip speed ratio of 0.78. Zakaria and Ibrahim (2020) studied on comparison between a conventional Savonius rotor and 0°, 90°, and 180° twist helical rotors. They found that the rotor with 0°, 90°, and 180° twist angle gives the maximum static torque coefficient of 0.434, 0.442, and 0.385.…”

Section: Review On Cfd Analysismentioning

confidence: 99%

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Debnath

Gandhirajan

2023

Wind Engineering

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The helical Savonius rotor (HSR) is used as green energy generation. The accurate design of HSR is essential before installing any wind farm in a region. It has been widely employed that positive static torque coefficients of helical Savonius rotor are higher compared to conventional semicircular rotor stated by several researchers. The reason is behind that the formation of secondary vortex of fluid. It is leading by vertical vortex flow, which passes over the curve surface and creates drag force. Still now, various design have been proposed to meet peak power output through optimum geometry parameters like blade profile design, aspect ratio and overlap ratio. The selection of blade material is also the influencing parameter to improve the starting torque of the rotor. In this regards present paper is aim to study the details experimental, numerical, and analytical review on HSR and selection of blade material with minimum production cost.

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Section: Review On Cfd Analysismentioning

confidence: 99%

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Debnath

Gandhirajan

2023

Wind Engineering

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“…The rotor blades in this study were designed using an organic shape, and the shape was mathematically analyzed. Another study by A. Zakaria et al, 8 looked into how the 180 • twist helical Savonius rotor performed depending on the time step and time increment. Numerous numerical investigations of the effectiveness of VAWTs have contributed to the domain's expertise [9][10][11][12][13][14][15] .…”

Section: Background and Literature Reviewmentioning

confidence: 99%

Numerical Investigation on Aerodynamic Performance of Helical Savonius Rotor Inspired by Natural Shapes

Bagade,

Chaudhari

et al. 2023

jmmf

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There have been extensive studies conducted on Horizontal Axis Wind Turbines (HAWT) at relatively moderate to high wind speed regions. However, such detailed investigations for Vertical Axis Wind Turbines (VAWT), specifically for low wind speed terrains are amply reported. This motivates us to conduct research to explore possibilities in improving performance of VAWT in low wind speed terrains, which is attempted in the present work. This is required due to the fact that most of regions do not have sufficient extractable wind energy due to low speeds. VAWTs can perform at such low wind speed, but are less efficient. Improving efficiency of VAWT will solve the purpose. Hence, the present study is aimed at finding the performance characteristics of VAWT for low Wind speed configurations. Various parameters affecting power generation are investigated. Numerical analyses on various configurations are conducted to study the effects of twist angle, free stream velocity, number of blades. Computational results obtained have been in good agreement with the established results for semi-circular Savonius rotor profile. The results suggest that for low wind speed terrains, there is a need to explore the combination of lift and drag type of profiles, which could be used for the utilization of available wind power. Hence, naturally inspired shapes (profiles) were investigated for the possible solution of combined lift and drag type wind turbines at low speeds. The blade shape for such combined lift and drag type wind turbine were deduced from the available literature. It is well established that the naturally inspired shapes as noted in sea conch follow golden ratio in its contours. The present study provides an insight on the characteristic curves of VAWT for low wind speed terrains, effects of various geometric and flow parameters suitable for low wind speed terrains.

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“…Semi-circular (Semi-circular) Figure 1. Semi-circular shape [18] This is the most common and frequently used form. The construction is straightforward, only using a cylinder split in half and arranged according to the shape of the letter 'S [19].…”

Section: Savonius Turbinementioning

confidence: 99%

Modification of the Vertical Axis with Variations in the Number of Blades of the Savonius Wind Turbine

Nawir,

Djalal,

Hasri

et al. 2023

JATM

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The potential wind speed in Indonesia is generally low at 3 m/s to 7 m/s so that this type of vertical axis turbine is considered very suitable for use in wind conditions in Indonesia. There are several types of vertical axis wind turbines. One type of vertical axis wind turbine is the Savonius wind turbine. Many advantages that this type of wind turbine has, such as being able to receive wind from all directions, easy and cheap to manufacture, and can rotate at a fairly low angular speed. This test was carried out to determine the performance of conventional and modified savonius turbines with 2 and 3 blades variables in each turbine blade shape. The form of modification made is by changing the shape of the blade twisting by 45o. The turbine is carried out on a laboratory scale with a wind source using a fan that is directly opposite the turbine. The results showed that the highest turbine power occurred in a modified 2-blade turbine, namely 1.88 Watt with a torque value of 0.04 Nm and a shaft rotation of 450 rpm. The highest rotation value is also obtained by 2 modified blades at a wind speed of 6 m/s producing 896 rpm. However, the highest torque value is obtained by a conventional 2-blade turbine with a value of 0.136 Nm. The highest turbine efficiency in each turbine is obtained by a modified 2 blade turbine with an efficiency value of 36.92% while the highest turbine efficiency for a modified 3 blade turbine reaches 11.69% which is considered less efficient than other turbines.

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Effect of twist angle on starting capability of a Savonius rotor – CFD analysis

Cited by 9 publications

References 11 publications

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Numerical Investigation on Aerodynamic Performance of Helical Savonius Rotor Inspired by Natural Shapes

Modification of the Vertical Axis with Variations in the Number of Blades of the Savonius Wind Turbine

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