The effects of deflector longitudinal position and height on the power performance of a conventional Savonius turbine

Salleh, Mohd Badrul; Kamaruddin, Noorfazreena M.; Mohamed-Kassim, Zulfaa

doi:10.1016/j.enconman.2020.113584

Cited by 48 publications

(22 citation statements)

References 47 publications

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“…The performance of the hybrid turbine is represented in the torque and power coefficient against the tip speed ratio illustrated in Fig 3 . The hybrid turbine generated a more significant torque coefficient value than the conventional Savonius turbine [16] with a CT value of 0.27 at a tip speed ratio of 0.38. The result demonstrates that the peak of the torque coefficient is higher despite having a low Reynolds number compared to the other hybrid turbines from the previous studies.…”

Section: The Performance Of the Hybrid Turbinementioning

confidence: 95%

“…The wake size downstream of the hybrid turbine is larger than the overall height due to pressure drag indicating a more significant energy loss in the flow [20]. This pressure drag due to the flow separation could be the reason for the deterioration of performance of the hybrid turbine that was lower than the conventional Savonius turbine [16,21,22] despite its higher torque coefficient values.…”

Section: The Performance Of the Hybrid Turbinementioning

confidence: 99%

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Experimental Study of a Hybrid Turbine for Hydrokinetic Applications on Small Rivers in Malaysia

Bakar

Shamsuddin

Kamaruddin

2022

ARASET

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Energy consumption has become a primary commodity due to technological revolutions in developing countries, such as the expansion of the hydrokinetic turbine as a renewable energy source to mitigate environmental issues. However, conventional vertical axis turbines in hydrokinetic applications particularly for small rivers with low speeds, have limited capabilities such as great power but poor self-start or vice versa. Therefore, the current study aims to address this issue by investigating a hybrid turbine through quantitative and qualitative wind tunnel experiments to improve the performance and self-start capability by integrating Savonius and Darrieus turbines. The findings discovered that the maximum torque coefficient of the hybrid turbine is 37% higher than that of a single conventional Savonius turbine. The integration of the hybrid turbine has resulted in a higher torque coefficient which has enhanced the self-start performance. The hybrid turbine achieved a maximum power output improvement of 30% at a low Reynolds number of 89500, typically representing the small river flow conditions. The presence of a substantial wake captured by the smoke generator at the rear part of the hybrid turbine signifies large drag resulting in power loss and a subsequent decrement in power output. The hybrid turbine has demonstrated its potential to be implemented in hydrokinetic applications in developing countries such as Malaysia for sustainable energy generation.

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Section: The Performance Of the Hybrid Turbinementioning

confidence: 95%

Section: The Performance Of the Hybrid Turbinementioning

confidence: 99%

Experimental Study of a Hybrid Turbine for Hydrokinetic Applications on Small Rivers in Malaysia

Bakar

Shamsuddin

Kamaruddin

2022

ARASET

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“…These studies have shown that the performance of the wind rotor decreases as the number of blades increases. To optimize the orientation of the air flow around the blades many augmentation technique have been added such as the shields (Morcos et al, 1981, Alexander & Holownia, (1978, deflector (Roy et al, 2014, Youssef et al, 2020, conveyor/deflector (Tartuferi et al, 2015), curtains (Altan & Atılgan, 2010), venting blade (Alom & Saha, 2018), deflector longitudinal (Salleh et al, 2020), V-shaped deflector (Shaughnessy & Probert, 1992), guide vane (El-Askary et al, 2015), straight deflector (Mohamed et al, 2010), they show a considerable improvement in the power of the Savonius wind turbine. The use of a straight deflector resulted in an increase in power coefficient of 27%.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a New Modified Savonius Wind Turbines

Mrigua

Zemamou

Aggour

2022

Int. J. Renew. Energy Dev.

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The classic Savonius semi-circular blade turbine has a relatively low power coefficient.The performance of a Savonius wind turbine depends on its geometrical parameters. Various blade profiles have been developed in the past years to improve the performance of this class of turbine. In this paper, a new blade shapes of Savonius wind turbine is investigated numerically by using the CFD method , by using transient conditions and set k omega turbulence model.The new blade has different concave and convex shape, which is a combination of the conventional and the elliptical blade. A comparative study of three blade profiles, semi-circular, elliptical and the composed blades have been performed.Flow structures around the rotor have also been analyzed. The results show that changing the blade shape has an effect on the performance efficiency of the Savonius turbine.The new modified and the elliptical blade exhibit higher performance compared to the conventional Savonius wind turbine. The new modified Savonius blade and the elliptical blade exhibit an improved performance compared to the conventional model in the order of 20.5% and 18.2% respectively at the tip speed ratio of 0.8.

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“…Meanwhile, Salleh et al, [15] investigated the effects of deflector longitudinal position and height on the power performance of a conventional Savonius rotor. Their work is intended to determine the optimal position and height of the deflector system, which serves as an augmentation device to improve the performance of the turbine.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Power Storage System for Savonius Turbines in Wind and Water

Kamaruddin

Shamsuddin²

2022

ARASET

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The Savonius turbine is practical in generating off-grid electrical power for hydrokinetic applications due to its simple design, particularly for small rivers in rural areas. However, despite many studies on methods to improve turbine performance, the electrical aspect of the turbine system is rarely discussed. Therefore, the present study aims to evaluate the performance of a simple and affordable power storage system using a conventional 2-bladed Savonius turbine. The experiment was conducted in a wind tunnel and a water channel with flow speeds of 6 m/s and 0.33 m/s, respectively, corresponding to a Reynolds number of 62700. A power coefficient of 0.09 was discovered for the wind experiment and 0.11 for the water. The total amount of energy extracted from the water was 60% less than from the wind due to the lower available power. It was observed that the tip speed ratio decreases over the charging period due to the constant current and voltage of the Lithium-Ion batteries. This will allow for a fluctuation in the amount of required current and consequently affect the torque needed to spin the generator. The findings confirmed the functionality of the electrical storage system and contributed to the low manufacturing and maintenance cost of the hydrokinetic turbines.

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The effects of deflector longitudinal position and height on the power performance of a conventional Savonius turbine

Cited by 48 publications

References 47 publications

Experimental Study of a Hybrid Turbine for Hydrokinetic Applications on Small Rivers in Malaysia

Experimental Study of a Hybrid Turbine for Hydrokinetic Applications on Small Rivers in Malaysia

Numerical Investigation of a New Modified Savonius Wind Turbines

Experimental Investigation of the Power Storage System for Savonius Turbines in Wind and Water

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