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Numerical investigation of performance of a new type of savonius turbine

TL;DR: In this article, a Savonius turbine of VAWT type has been used to induce fire-whirls in laboratories, and the computational results show that the new design has a higher steady state angular velocity as well as higher coefficient of power than the conventional Savoni turbine.
Abstract: Wind energy is non-polluting and is freely available in many areas and is gaining popularity among researchers. Among wind turbines, Horizontal Axis Wind Turbines (HAWT) are more common compared to Vertical Axis Wind Turbines (VAWT) mainly because of their higher efficiency. However, Savonius turbine of VAWT type has many advantages over others such as simplicity in construction, lower cost of production, constancy of the output power regardless of the wind direction, and good starting torque at low wind speed. It is conceived that the efficiency of the Savonius turbines can be increased using industrial wasted heat primarily due to their structural similarity with the split chambers which are often used to induce fire-whirls in laboratories. This work deals with a basic design of such combined configuration and compares its efficiency with a conventional Savonius turbine. The computational results show that the new design has a higher steady state angular velocity as well as higher coefficient of power than the conventional Savonius turbine.

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Citations
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Journal ArticleDOI
TL;DR: In this paper, wind tunnel experiments have been carried out to optimize the swirling Savonius turbine geometry in terms of maximum power coefficient by considering several design parameters, such as blade overlap ratio, hot air inlet diameter and the condition of the top end plate.
Abstract: It has been suggested that waste heats or naturally available heat sources can be utilized to produce swirling flow by a design similar to that of split channels which is currently used to initiate fire whirls in laboratories. The new design combines the conventional Savonius wind turbine and split channel mechanisms. Previous computational and preliminary experimental works indicate a performance improvement in the new design (named as swirling Savonius turbine) compared to the conventional Savonius design. In this study, wind tunnel experiments have been carried out to optimize the swirling Savonius turbine geometry in terms of maximum power coefficient by considering several design parameters. The results indicate that the blade overlap ratio, hot air inlet diameter and the condition of the top end plate have significant influence on power and torque coefficients, while a larger aspect ratio and closed top end plate have some favourable effects on the performance. The optimum configuration has been tested in four different wind velocities to determine its influence on the performance, and power coefficients were found to be higher in high wind velocities. The performance comparison of optimum configuration with conventional Savonius rotor showed an increase of 24.12% in the coefficient of power.

32 citations


Cites background or methods from "Numerical investigation of performa..."

  • ...The modification made in the swirling Savonius turbine is that, the inner tips of the half cylindrical blades extended further to construct a swirling chamber [28,29]....

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  • ...[28] proposed an innovative low cost technique of performance improvement of Savonius turbines using hot air sourced from either industrial waste heat or natural heat sources....

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Journal ArticleDOI
TL;DR: In this paper, a new hybrid power system has been proposed combining the conventional Savonius wind turbine and split channel mechanisms, and a simulation method for predicting their aerodynamic performance using control volume based CFD package of ANSYS CFX.

26 citations


Cites methods or result from "Numerical investigation of performa..."

  • ...An increase in rotational speed and power coefficient of the SST compared to conventional Savonius turbine was reported [7]....

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  • ...An innovative technique of performance improvement was proposed by combining the split channel mechanism with the primary Savonius wind turbine mechanism to a new hybrid design of Swirling Savonius turbine (SST) [7]....

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Proceedings ArticleDOI
01 Oct 2019
TL;DR: This article presents a kind of apologetics for cross-flow wind machines: a combination of improvements of the conventional wind rotors and of their coupling to the electricity generators.
Abstract: This article presents a kind of apologetics for cross-flow wind machines At the beginning, general knowledge and initial stages of development for S-type rotors are described The historical review continues with the stage of reduced interest, followed by the stage of enhanced interest after the oil crisis of 70-ies The main advancements and advantages are conveyed Historical evolution of cross-flow runners is also addressed A brief look on the evolution of coaxial wind and electrical rotors is provided as an introduction to the authors’ approach for advancements: a combination of improvements of the conventional wind rotors and of their coupling to the electricity generators The invented Wind Electric Machine Without Stators is quoted The development of competitive vertical axis wind machines is suggested as an important public task, which has to change the agenda of the wind industry

8 citations

Journal ArticleDOI
TL;DR: In this paper, wind tunnel experiments were carried out on a geometrically optimal swirling Savonius turbine by varying flow parameters to determine their effects on power and torque coefficients.
Abstract: Wind tunnel experiments were carried out on a geometrically optimal swirling Savonius turbine by varying flow parameters to determine their effects on power and torque coefficients. The optimum geometrical configuration used in this experiment was adopted from an earlier study that features 0.20 blade overlap ratio, 195˚ blade arc angle, and 1.06 rotor aspect ratio of a 320 mm diameter rotor with closed top end plate. The parameters considered in this experimental are the hot air temperature, hot air mass flow rate, hot air inlet diameter of swirl chamber, and the free-stream wind velocity. The results indicate that higher hot air temperature and hot air mass flow rate promotes performance of the turbine while power coefficient reached maximum at a certain hot air inlet diameter. Tests on the optimum geometry at four wind velocities revealed that power coefficients are higher in higher wind velocities.

7 citations


Cites background or methods from "Numerical investigation of performa..."

  • ...The spring balance readings (S) and the dead weights (W) of the dynamometer are recorded and then used to calculate the brake torque of the rotor using the formula SW dD T wsh 2 (1) Al-Faruk and Sharifian /International Journal of Automotive and Mechanical Engineering 12 (2015) 2929-2943 where Dsh is the diameter of the rotor shaft and dw is the string diameter....

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  • ...Only hot surfaces of the heating plates sat inside the enclosure due to safety concerns as shown in Al-Faruk and Sharifian /International Journal of Automotive and Mechanical Engineering 12 (2015) 2929-2943 Figure 3....

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  • ...The optimum configuration was adopted from an earlier study by Al-Faruk and Sharifian [23], which featured 0.20 blade overlap ratio, 195° blade arc angle, and 1.06 rotor aspect ratio of a 320 mm diameter rotor with closed outlet of swirling chamber....

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  • ...Later on, Al-Faruk and Sharifian [23] carried out experimental investigations on the swirling Savonius turbines by considering several geometrical design parameters to find out their effects on the aerodynamic coefficients as well as to optimize the geometry for which the power coefficient reaches the maximum....

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  • ...Al-Faruk, Sharifian [22] proposed an innovative low cost technique of performance improvement by inducing hot air swirling flows inside the turbine enclosure....

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09 Dec 2014
TL;DR: In this paper, the influence of blade overlap, blade arc angle and the diameter of the hot air inlet hole on the torque and power coefficient of a Savonius wind turbine was investigated.
Abstract: When compared with other wind turbines, drag driven vertical axis Savonius wind turbine offers lower power coefficient due to its slow turning speed. However, they have many advantages over others, such as simplicity of manufacturing, ability to operate in any wind direction, and having a good starting torque at low wind speed. They are well suited to be integrated in urban environment as small scale power generating wind mills. Waste heats or naturally available heat sources such as geothermal and solar energy can be utilized to produce swirling flow when there is a source of angular momentum. Previous computational work suggests that the performance of Savonius turbine can be improved by providing a hot swirling flow inside the turbine chamber. The swirling flow can be induced by a design similar to that of split channels, which includes one or a few vertical slits, and is currently used to onset fire whirls in the laboratories. In the present experimental study, the influence of blade overlap, blade arc angle and the diameter of the hot air inlet hole on the torque and power coefficient have been investigated. The results indicate that the maximum power coefficient for a 258 mm diameter rotor occurs at 28 mm blade overlap, '195°' blade angle and 9 mm diameter of hot air inlet hole.

4 citations


Cites background from "Numerical investigation of performa..."

  • ...[1] to determine the effects geometrical parameters on its performance....

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  • ...[1] proposed an innovative low cost technique of performance improvement using industrial waste heat....

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  • ...which has 180 o blade angle, the inner tips of the half cylinders extended further to construct the swirling chamber [1]....

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References
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Journal ArticleDOI
TL;DR: In this paper, a helical Savonius rotor with a twist of 90° was proposed to decrease the variation in static torque from 0° to 360°, and the performance of the helical rotor with and without shaft was compared in an open jet wind tunnel.

258 citations


"Numerical investigation of performa..." refers background in this paper

  • ...In this work, an innovative low cost technique is considered to increases the low efficiency of the conventional Savonius turbines [6,8] using industrial waste heat or natural heat sources....

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Journal Article

242 citations


"Numerical investigation of performa..." refers methods in this paper

  • ...A vertical axis wind machine proposed by Finnish Engineer Sigurd Savonius [11] is basically a drag type rotor....

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Journal ArticleDOI
TL;DR: In this article, the authors presented a study, carried out with the help of the French Agency of Innovation (ANVAR), which deals with the conception of a small Savonius rotor (i.e. of low power) for local production of electricity.

237 citations


"Numerical investigation of performa..." refers background in this paper

  • ...In this work, an innovative low cost technique is considered to increases the low efficiency of the conventional Savonius turbines [6,8] using industrial waste heat or natural heat sources....

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  • ...A review of Savonius rotor advantages and disadvantages is presented in Menet [8]....

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  • ...A review of Savonius rotor advantages and disadvantages is presented in Menet [8]....

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Journal ArticleDOI
TL;DR: In this article, the aerodynamic performance and flow fields of Savonius rotors at various overlap ratios have been investigated by measuring the pressure distributions on the blades and by visualizing the flow fields in and around the rotors with and without rotation.

205 citations


"Numerical investigation of performa..." refers background in this paper

  • ...The optimum overlap ratio (e/d) value has been found as 0.15 by Fujisawa [3], thus the gap distance (e) becomes 2.6 cm and the rotor diameter (D) is calculated as 32 cm. Experiments at an overlap ratio of 0.15 and an aspect ratio (H/D) of 1.0 have been reported to have a maximum power coefficient by Fujisawa and Gotoh [4] and Kamoji et al. [7]....

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  • ...15 by Fujisawa [3], thus the gap distance (e) becomes 2....

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Journal ArticleDOI
TL;DR: In this paper, the influence of the buckets overlap ratio of a Savonius wind rotor on the averaged moment and power coefficients, over complete cycles of operation, is discussed, based on the commercial software Star-CCM+.

190 citations


"Numerical investigation of performa..." refers background in this paper

  • ...However, it generates power through the combined effect of drags and the lift forces [1]....

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