Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Puspitasari, Dewi; Sahim, Kaprawi

doi:10.15282/jmes.13.4.2019.09.0465

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…This result is in agreement with Abohela et al [50]. Similar studies by Puspitasari et al [51] shows that they were able to achieved a C p value of 0.20 which indicates 48% increase in the power coefficient. The power coefficient is slightly higher because the operating condition is not the same and the wind speed is 10 m/s as regard to the 4.5 m/s used in this study.…”

Section: Resultssupporting

confidence: 91%

“…For the bare-hybrid VAWT, a maximun C Q value of 0.098 was obtained at λ of 0.88, however when the hybrid VAWT was integrated onto the building rooftop, th C Q values increases from a value of 0.098 to 0.141 at λ of 1.11. that the C Q values of the building integrated hybrid VAWTs increases by 44% which indicate that the building integrated hybrid VAWT has greater torque coefficient compared to the bare-hybrid VAWT. However, similar studies by Puspitasari et al [51] showed that they are able to achieve a C Q value of 0.129 which indicates 29% increase in the power coefficient. In addition, Figure 12 presents the power generated by the building integrated hybrid VAWT and the bare-hybrid VAWT.…”

Section: Resultsmentioning

confidence: 71%

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Design and Testing of Building Integrated Hybrid Vertical Axis Wind Turbine

Gwani¹,

Kangiwa²,

Wisdom³

2021

JEEE

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Building integrated wind turbine are considered as part of a group of technologies that are suitable for domestic micro-energy generation. Darrieus and Savonius turbines work efficiently in the urban environment at low wind speed, the Savonius rotor is self-starting and creates high torque but has low efficiency, while the Darrieus rotor is very efficient but does not self-start easily. Thus, the combination of these rotors as hybrid system would help to improve the overall efficiency of the wind turbines. The aim of this paper was to design, fabricate and experimentally investigate the performance of hybrid Vertical Axis Wind Turbine (VAWT) on residential buildings. A building model with gable rooftop was design and fabricated for use in testing of the hybrid VAWT. The height of the hybrid VAWT was paced at Y = 150 mm above the rooftop. The results obtained from the studies showed that the hybrid VAWT mounted on the building rooftop yield up to 63% more energy compared to the bare-hybrid VAWT (without building). Similar improvement in performance of the hybrid VAWT is also observed in the rotational speed, mechanical power and the coefficient of torque, where the building integrated hybrid VAWT outperformed the bare-hybrid VAWT. Thus the results indicate that urban buildings are suitable for the mounting of the hybrid VAWT.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 71%

Design and Testing of Building Integrated Hybrid Vertical Axis Wind Turbine

Gwani¹,

Kangiwa²,

Wisdom³

2021

JEEE

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“…Cp is directly dependent on the rotational velocities and, therefore, the moment developed on the blades. The power coefficient is directly proportional to the moment coefficient (Cm) and tip speed ratio (TSR), denoted as λ. TSR is the ratio of the characteristic moment arm length (R blade ) multiplied by the rotational speed of the blade (Ω) to the corresponding wind velocity (V), and it is calculated using Equation (7).…”

Section: Cp =mentioning

confidence: 99%

“…Savonius turbines are notable for their self-starting nature thanks to their high torque at lower speeds. This feature makes them suitable for conditions with low wind speeds [7]. However, despite high starting torque, Savonius turbines have lower efficiency compared to Darrieus turbines, which are typical lift-type airborne wind turbines [8].…”

Section: Introductionmentioning

confidence: 99%

Performance Rating and Flow Analysis of an Experimental Airborne Drag-Type VAWT Employing Rotating Mesh

Güneş,

Kükrer

2024

Computation

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This paper presents the results of a performance analysis conducted on an experimental airborne vertical axis wind turbine (VAWT), specifically focusing on the MAGENN Air Rotor System (MARS) project. During its development phase, the company claimed that MARS could generate a power output of 100 kW under wind velocities of 12 m/s. However, no further information or numerical models supporting this claim were found in the literature. Extending our prior conference work, the main objective of our study is to assess the accuracy of the stated rated power output and to develop a comprehensive numerical model to analyze the airflow dynamics around this unique airborne rotor configuration. The innovative design of the solid model, resembling yacht sails, was developed using images in the related web pages and literature, announcing the power coefficient (Cp) as 0.21. In this study, results cover 12 m/s wind and flat terrain wind velocities (3, 5, 6, and 9 m/s) with varying rotational velocities. Through meticulous calculations for the atypical blade design, optimal rotational velocities and an expected Tip Speed Ratio (TSR) of around 1.0 were determined. Introducing the Centroid Speed Ratio (CSR), which is the ratio of the sail blade centroid and the superficial wind velocities for varied wind speeds, the findings indicate an average power generation potential of 90 kW at 1.4 rad/s for 12 m/s and approximately 16 kW at a 300 m altitude for a 6 m/s wind velocity.

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“…However the main disadvantage of the vertical-axis turbine is a low coefficient of performance (CP) [4]. In an effort to improve the coefficient of performance, researchers have tried to modify the blade shape of vertical-axis turbine to be helical-blade [5], trapezoidal-blade [6], contra-rotating blade [7], cavity vane's geometry [8], hybrid Darrieus-Savonius [9], or even to be a blade with flexible material [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Utama¹,

Satrio²,

Mukhtasor³

et al. 2020

JMES

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The main disadvantage of the vertical-axis turbine is its low coefficient of performance. The purpose of this work was to propose a method to improve this performance by investigating the hydrodynamic forces and the flow-field of a foil that was modified with a sinusoidal leading-edge tubercle. NACA 63(4)021 was chosen as the original foil since it has a symmetrical profile that is suitable for use on a vertical-axis tidal-current turbine. The study was conducted using a numerical simulation method with ANSYS-CFX Computational Fluid Dynamics (CFD) code to solve the incompressible Reynolds-Averaged Navier-Stokes (RANS) equations. Firstly, the simulation results of the original foil were validated with available experimental data. Secondly, the modified foils, with three configurations of tubercles, were modelled. From the simulation results, the tubercle foils, when compared with the original foil, had similar lift performances at low Angles of Attack (0-8 degrees of AoA), lower lift performances at medium AoA (8-19 degrees) and higher lift performances at high AoA (19-32 degrees). A tubercle foil with Height/Chord (H/C) of 0.05 can maintain the static stall condition until 32 degrees. Therefore, a vertical-axis turbine with tubercle-blades provides an opportunity to increase its performance by extending the operational range for extracting energy in the dynamic stall condition.

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Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Cited by 8 publications

References 12 publications

Design and Testing of Building Integrated Hybrid Vertical Axis Wind Turbine

Design and Testing of Building Integrated Hybrid Vertical Axis Wind Turbine

Performance Rating and Flow Analysis of an Experimental Airborne Drag-Type VAWT Employing Rotating Mesh

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

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