Performance enhancement of a twisted Savonius hydrokinetic turbine with an upstream deflector

Mosbahi, Mabrouk; Elgasri, Sana; Lajnef, Mariem; Bouzid, Mosbahi,; Driss, Zied

doi:10.1080/15435075.2020.1825444

Cited by 33 publications

(6 citation statements)

References 30 publications

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“…Their obtained results indicate that the helical Savonius rotor models are suitable to analyze the water flows in the turbine. Mosbahi et al (2021) studied on twisted hydrokinetic Savonius turbine with and without upstream deflector. They found that peak value of power coefficient of 0.166 at tip speed ratio of 0.78 without deflector.…”

Section: --mentioning

confidence: 99%

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Debnath

Gandhirajan

2023

Wind Engineering

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The helical Savonius rotor (HSR) is used as green energy generation. The accurate design of HSR is essential before installing any wind farm in a region. It has been widely employed that positive static torque coefficients of helical Savonius rotor are higher compared to conventional semicircular rotor stated by several researchers. The reason is behind that the formation of secondary vortex of fluid. It is leading by vertical vortex flow, which passes over the curve surface and creates drag force. Still now, various design have been proposed to meet peak power output through optimum geometry parameters like blade profile design, aspect ratio and overlap ratio. The selection of blade material is also the influencing parameter to improve the starting torque of the rotor. In this regards present paper is aim to study the details experimental, numerical, and analytical review on HSR and selection of blade material with minimum production cost.

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Section: --mentioning

confidence: 99%

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Debnath

Gandhirajan

2023

Wind Engineering

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“…Sehingga arus laut yang mengenai turbin akan menjadi lebih cepat. Deflector pada penelitian sebelumnya menggunakan model satu arah, sehingga efisiensi yang dihasilkan tidak akan meningkat jika aliran datang dari arah aliran yang berbeda (Golecha, et al, 2011;Mosbahi, et al, 2021;Sahim, et al, 2015). Adapun inovasi dalam penelitian ini menggunakan deflector dari berbagai macam arah yang mengelilingi rotor turbin, sehingga dapat menerima dari berbagai macam arah aliran arus dan efisiensi yang dihasilkan dapat menjadi lebih baik.…”

Section: Pendahuluanunclassified

Studi Eksperimen Model Water Flow Deflector Untuk Meningkatkan Performa Turbin Arus Laut Tipe Vertikal Pada Kecepatan Arus Rendah

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Rafi

Asyidiqi³

et al. 2022

Jurnal Wave

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Indonesia mempunyai potensi energi arus laut sebesar 17.989 MW, yang telah diratifikasi oleh Asosiasi Energi Laut Indonesisa (ASELI) pada tahun 2014. Hasil survei tersebut menunjukan bahwa kecepatan arus laut di Indonesia tergolong rendah, namun potensinya sangat besar. Potensi tersebut belum dimanfaatkan secara optimal untuk menutupi kekurangan rasio elektrifikasi di Indonesia. Adapun dalam memanfaatkannya dibutuhkan teknologi turbin untuk mengkonversi menjadi energi listrik. Turbin yang dapat bekerja pada kecepatan arus rendah adalah tipe vertikal sudu lurus, namun efisiensi yang dihasilkan masih cukup rendah. Sehinngga, penelitian ini bertujuan untuk meningkatkan performa turbin arus laut tipe vertikal dengan menambahkan water flow deflector. Prinsip kerja deflector berdasarkan Hukum Kontinuitas, yang mana dengan memperkecil luas permukaan input maka arus laut yang mengenai turbin akan meningkat sehingga menghasikan putaran dan torsi yang lebih besar. Metode yang digunakan dalam penelitian ini adalah, eksperimen karena lebih mendekati dengan kondisi aktual. Hasil akhir penelitian ini telah menunjukkan bahwa, water flow deflector telah meningkatkan performa turbin sebesar ....%. Sehingga, water flow deflector sangat direkomendasikan untuk diterapkan di wilayah perairan Indonesia yang cenderung berkecepatan arus rendah.

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“…Another researcher investigated an impinging jet duct system on a Savonius turbine and concluded that using such a duct can increase the efficiency such that it reached 0.5 at 0.6 TSR [23]. In the study by Mosbahi et al [24], an experiment and a CFD analysis were carried out to assess the use of a deflector in an irrigation channel. The authors investigated three different deflector types, and the results found that the peak value of performance with the deflector in use was increased by 17.47%.…”

Section: The State Of the Artmentioning

confidence: 99%

A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

et al. 2022

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The effects of climate change are growing more and more evident, and this is caused by the increase in CO2 emissions. Fossil fuel exhaustion and the need for electricity in remote areas have encouraged researchers to advance and develop the renewable energy sector. One type of clean energy technology is vertical water turbines that have low efficiency. This paper aims to design and simulate a novel close-ended, guided deflector to improve the efficiency of vertical turbines. This research used the dynamic mesh technique to evaluate the concept after the deflector was designed, and a grid independence study, a boundary sensitivity study, and a timestep sensitivity study were implemented to ensure the accuracy of the results. Then, we used the sliding mesh model to determine the performance of four rotors. The results from the dynamic mesh model showed that the straight rotor with the proposed deflector was not suitable for operating in the deflector, and the concept is static and does not rotate. However, the others showed a valid concept in the proposed deflector. For the sliding mesh technique, the results indicated a common trend: all the rotors’ performances increased when tip speed ratio (TSR) increased, and the highest amount of the power coefficient (Cp) was found at higher TSRs, such as 1.3 and 1.4, with around 0.45 in the cross flow type. A three-dimensional simulation was conducted of the cross flow type with the proposed deflector, and a similar trend was found. Nevertheless, around a 5% difference was found between the 3D and 2D results for cross flow. The deflector can significantly improve the performance after 0.7 TSR to reach over 0.42 Cp at 1.3 TSR, whereas, without the deflector, the performance reduces to approximately 0.1 Cp at the same TSR.

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Performance enhancement of a twisted Savonius hydrokinetic turbine with an upstream deflector

Cited by 33 publications

References 30 publications

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

A comprehensive review on design and development analysis and blade material selection of helical Savonius rotor

Studi Eksperimen Model Water Flow Deflector Untuk Meningkatkan Performa Turbin Arus Laut Tipe Vertikal Pada Kecepatan Arus Rendah

A CFD Analysis for Novel Close-Ended Deflector for Vertical Water Turbines

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