Influence of a passive upstream deflector on the performance of the Savonius wind turbine

Tian, Wenlong; Bian, Jiaheng; Yang, Guangyong; Ni, Xiwen; Mao, Zhaoyong

doi:10.1016/j.egyr.2022.05.244

Cited by 25 publications

(4 citation statements)

References 32 publications

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“…Thus, it was determined that the power coefficient obtained with the flat plate dual Savonius wind turbine increased by 42% compared to the power coefficient of the single Savonius wind turbine. Especially when the previous studies in the literature were examined, considering the performance increases made with additional devices without structurally modifying the Savonius wind turbine itself, the power coefficient increases compared to the conventional Savonius wind turbine were determined as 20% with conveyor-deflector curtain system by Tartuferi et al, 32 32% with airfoil-shaped deflector by Layeghmand et al, 30 12% with circular cylinder by Yuwono et al 31 and 25% with passive deflector by Tian et al 34 It was determined that the performance improvement obtained with this study was quite good compared to the previous studies.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the turbine performances in the case of dual usage of Savonius wind turbines

Altan

Güngör

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this study, the turbine performances of Savonius wind turbines were investigated in the case of dual usage. While implementing the dual use of the Savonius wind turbine, a flat plate deflector was placed in front of the turbines to increase the turbine performance. The effects of design parameters such as the geometric dimensions of this flat plate placed in front of the turbines and the geometrical placement position on the turbine performance were investigated. In this direction, the flat plate prevented the negative torque that occurs during the operation of the turbines. Hence, the plate guided the wind to the turbine blade, which generated positive torque. The numerical analyses made in this study were confirmed by the previous literature study. The performance values of single, dual, and flat plate dual Savonius wind turbines were analyzed using the numerical analysis method, the accuracy of which was proven by the experimental data. It was determined that the similarity between the experimental result and the numerical result was approximately 0.3%, especially in the maximum power coefficient values. The computational fluid dynamics (CFD) program ANSYS Fluent was used for turbine performance analysis. With this design study, the maximum power coefficient ( Cp) was obtained around 0.17 with a single Savonius wind turbine, while the maximum power coefficient ( Cp) was obtained around 0.24 with a flat plate dual Savonius wind turbine. As a result, the power coefficient obtained with a single Savonius wind turbine increased by 42% in the flat plate dual Savonius turbine system when compared to the power coefficient of the single Savonius wind turbine. Thus, it was determined that the power coefficient obtained with a single Savonius wind turbine in the flat plate dual Savonius turbine system increased by 42% compared to the power coefficient of the single Savonius wind turbine.

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Section: Resultsmentioning

confidence: 99%

Investigation of the turbine performances in the case of dual usage of Savonius wind turbines

Altan

Güngör

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The number of blades in the fixed deflector was determined as a result of optimization according to power coefficient values as turbine performance indicators. Tian et al [31] designed a passive deflector that can self-position according to the direction of the wind. The efficiency of the Savonius wind turbine was improved by the passive deflector's ability to passively adjust its position with a change in wind direction.…”

Section: Exterior Design Studiesmentioning

confidence: 99%

Investigation of Performance Enhancements of Savonius Wind Turbines through Additional Designs

Deda Altan,

Gultekin

2023

Processes

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This study examines the literature on improving the low performance of Savonius wind turbines, which are a type of vertical axis wind turbine. The literature studies on improving the performance of Savonius turbines have been summarized into two categories: interior structural design and exterior additional design. Due to the extensive nature of studies focusing on interior design changes, this research primarily focuses on performance studies related to exterior design modifications of Savonius wind turbines, particularly in recent years. This study aimed to provide a comprehensive examination of these performance studies and contribute to the existing literature by presenting a systematic reference on this issue. To achieve this objective, a thorough review of turbine exterior design studies has been conducted. The focus was on determining the percentage increase in power coefficient achieved by turbines with exterior design modifications compared to the classical turbine versions. Here, it has been determined that the power coefficient values of Savonius wind turbines can reach approximately 0.400 through interior design changes. However, with the implementation of additional exterior design modifications, these power coefficient values can be further increased to around 0.520. Thus, within the scope of this study, it has been determined that the turbine power coefficients show a fairly good increase with exterior design techniques compared to interior design techniques.

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“…The enhancement of Savonius rotor performance can be achieved through the utilization of passive deflectors, which serve to mitigate the adverse torque exerted on the blades during their return phase. The presence of unstable aerodynamic forces results in a minor deviation in pitch angle between the stable position and the initial position of the passive deflector [21].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Deflector Angle on the Performance of Turbine Combination Darrieus-Savonius

Irfin,

Adiwidodo,

Yudiyanto

et al. 2024

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The Savonius and Darrieus are vertical-axis wind turbines. This turbine has resistance on one side of the blade that makes it difficult for the shaft to rotate resulting in reduced efficiency. However, the vertical shaft turbine type provides the advantage of being able to accept wind speeds from any direction without an additional tail. Savonius and Darrieus turbines show different characteristics in terms of their performances. Savonius turbine has a high power coefficient (CP) in the range of low tip speed ratio (TSR), when its TSR increases the CP will fall. In contrast to Darrieus, high CP is achieved if the TSR is also high but the CP achievement will fall at a low TSR. If it is compared to Savonius, Darrieus has higher power efficiency although it is difficult to self-start. In contrast to Savonius, Darrieus has a better self-starting ability but a lower efficiency. This study aims to improve the performance of vertical shaft wind turbines by creating a new design combination of Darrieus and Savonius turbines with deflectors to produce CP achievement on a wide TSR. The combination of the Darrieus-Savonius turbine is to improve efficiency to make self-start easier. The research method uses numerical simulation by employing CFD Ansys software. On the airfoil with a deflector angle of 70 deg, it shows that there is an increase in speed in several parts of the Darrieus blade airfoil. The increase in speed causes the decrease of static pressure in the area. The pressure difference between the sides of the airfoil surface causes a force. The direction of the force causes the turbine shaft to rotate. The deflector acts as a directional headwind, increasing the local flow velocity to counter the resistance on one side of the rotor blades The average torque produced at an angle of 70 deg is 0.5 Nm. Whereas, at an angle of 90 deg, the average torque generated is lower by around 0.15 Nm.

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Influence of a passive upstream deflector on the performance of the Savonius wind turbine

Cited by 25 publications

References 32 publications

Investigation of the turbine performances in the case of dual usage of Savonius wind turbines

Investigation of the turbine performances in the case of dual usage of Savonius wind turbines

Investigation of Performance Enhancements of Savonius Wind Turbines through Additional Designs

The Effect of Deflector Angle on the Performance of Turbine Combination Darrieus-Savonius

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