The effects of a deflector on the self-starting speed and power performance of 2-bladed and 3-bladed Savonius rotors for hydrokinetic application

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

doi:10.1016/j.esd.2021.02.005

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…The result agrees well with the findings of Salleh et al, [21], who compare the power coefficient for wind and water channels. Note that although the coefficient of power, CP is within the range of reported literature [22][23][24], however, the instantaneous amount of power output from the current rotor is still insufficient in comparison to the power required for common electrical appliances. The power required for common household appliances is given in Table 1.…”

Section: Accumulated Energymentioning

confidence: 75%

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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Section: Accumulated Energymentioning

confidence: 75%

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

Kamaruddin

Shamsuddin²

2022

ARASET

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“…Regarding Blade number, according to [31], 2 bladed configurations show better power coefficient values while 3 bladed designs exhibit a decrease in the negative torque variations and hence higher torque coefficient values. These findings are in are consistent with the findings in [32].…”

Section: Turbine Design Methodology and Parameter Selectionmentioning

confidence: 99%

Miniature water flow energy harvester based on savonius-type microturbine: an experimental study

Lepipas,

Holmes

2024

Smart Mater. Struct.

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In this experimental study, a miniature turbine-based water flow energy harvester designed for the purpose of providing power to wireless sensors within water pipes is reported. The device comprises a Savonius-type turbine and a radial flux permanent magnet electromagnetic generator. The two are magnetically coupled so that, while the turbine is submerged in the water flow, the generator operates in air. The device is cylindrical with a diameter of 0.8 cm and a length of 7.2 cm and, when inserted through a hole in a pipe wall so that only the turbine protrudes into the flow,it presents a cross-sectional area to the flow of only 1.25 cm2. Manufacturing was achieved through a blend of conventional machining methods, laser cutting, rapid prototyping, and flexible printed circuit board technology for the generator stator. To ensure low friction and minimize cut in speed, ceramic ball bearings were employed. The prototype can function effectively at water velocities as low as 0.5 m/s, generating electrical power within the range of 125 μW to 5.1 mW when subjected to flow speeds between 0.5 and 2 m/s. A maximum overall efficiency of 2.2% is achieved, when the water speed is 0.8 m/s. Performance curves derived from experimental testing of the turbine for a range of rotor designs, obtained on a water flow rig, are presented and discussed.

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“…The Prony brake dynamometer system was positioned on top of the wind tunnel. Two load cells, a braking belt around the pulley, a hall effect sensor, and digital displays comprise the system with the load cells having an accuracy of 0.1% and a maximum load capacity of 50 N [25]. The rotation of the turbine model with tubercles was determined by the sensor that detected the metal on the pulley.…”

Section: Methodsmentioning

confidence: 99%

“…The small rivers in rural areas typically have low speeds ranging from 0.2 m/s to 0.5 m/s, making it challenging to implement the Savonius turbines in this condition due to the low power efficiency [21][22] and their poor ability to self-start at low rates despite having a simple design [23][24]. Although Salleh et al, [25] recently established the effectiveness of implementing deflectors into the Savonius turbine to improve power performance, this type of augmentation device adds complexity to the overall turbine configurations for practical riverside installation [26]. Therefore, it is important to conduct a more comprehensive evaluation and analysis of the effects of modifying the tubercle locations.…”

Section: Introductionmentioning

confidence: 99%

Performance of Savonius Turbines with Tubercles Inspired by Humpback Whales

Sohib Abdelsattar,

Nurul Asyikin Abu Bakar,

Noorfazreena Mohammad Kamaruddin

2023

ARASET

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Recent studies found that tubercles had been integrated into various applications beyond nature to enhance performance. Therefore, the present work investigates the performance of a Savonius turbine with various tubercle configurations at a wind speed of 7 m/s which corresponds to a Reynolds number of 148,000. The Savonius turbines with tubercle features were initially designed and inspired by the distribution of tubercles on the flippers of humpback whales. However, only the models with the best performance were chosen for fabrication and tested in the wind tunnel. The new turbine designs have 33% of the blade without tubercles, with turbine model 1 (D1) having a large tubercle beginning in the midspan and tapering towards the endplates, while turbine model 2 (D3) applies the 33% without tubercles in the midspan of the blade. The results demonstrated that turbine model 1 had the highest maximum Cp of 0.19 at the tip speed ratio of 0.78 and indicated that the spanwise location of tubercles in which it is integrated into the turbine is a significant geometric arrangement to improve the performance. The new turbine models designed with tubercles performed significantly better than the baseline model, with 46.15% and 23.08% improvements, respectively. The flow visualization for both models with tubercle configurations showed smaller wake sizes that represent reduced drag and eventually produced higher performance in comparison with the baseline. The results provide insights into the implementation of the tubercles concept on a Savonius turbine with a low aspect ratio.

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The effects of a deflector on the self-starting speed and power performance of 2-bladed and 3-bladed Savonius rotors for hydrokinetic application

Cited by 15 publications

References 33 publications

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

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

Miniature water flow energy harvester based on savonius-type microturbine: an experimental study

Performance of Savonius Turbines with Tubercles Inspired by Humpback Whales

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