Studi Numerik Pengaruh J Shaped Blade Ratio Pada Turbin Hidrokinetik Sumbu Vertikal Bertingkat terhadap Performansi Mekanik

Wardana, Arif (2025) Studi Numerik Pengaruh J Shaped Blade Ratio Pada Turbin Hidrokinetik Sumbu Vertikal Bertingkat terhadap Performansi Mekanik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Turbin hidrokinetik sumbu vertikal aksis dengan menggunakan tipe darrieus memiliki koefisien performansi lebih tinggi dibandingkan dengan tipe savonius. Namun, tipe darrieus memiliki kelemahan dalam performa self start dibandingkan dengan tipe savonius. Adapun penelitian terbaru terkait J shaped blade pada turbin angin mampu untuk meningkatkan performa self start dan koefisien daya mekanik. Namun, beberapa penelitian menyebutkan peningkatan tersebut dibandingkan menggunakan airfoil hanya maksimum pada saat mencapai TSR 2. Adapun penggunaan konfigurasi bertingkat dikombinasikan untuk mendapatkan performa yang optimal. Lalu, rasio bilah J shaped yang digunakan adalah 10% hingga 40% dimana jumlah bilah yang digunakan yaitu 3, 6, dan 9 bilah. Kecepatan operasi kanal yang digunakan adalah 0.5 m/s hingga 3 m/s. Penelitian ini dilakukan sepenuhnya dengan simulasi CFD. Hasil yang didapatkan yaitu pengaruh dari penambahan bilah adalah menurunkan putaran turbin tetapi memberikan peningkatan torsi dan koefisien daya mekanik. Sedangkan, pengaruh dari penambahan rasio bilah adalah menaikkan putaran turbin namun terdapat fluktuasi peningkatan/ penurunan koefisien daya mekanik dan torsi. Pada kecepatan operasi kanal 3 m/s didapatkan bahwa dengan penambahan rasio bilah J shaped maka koefisien daya mekanik meningkat secara berurutan mulai dari rasio 10% hingga 40%.
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A vertical axis hydrokinetic turbine of the Darrieus type generally exhibits a higher power coefficient than the Savonius type but suffers from poor self start performance, which refers to the ability of the turbine to initiate stable rotation from rest due to interaction with free-stream flow. While Savonius turbines self-start more easily, they are less efficient in energy conversion. Recent developments in wind turbines have introduced J shaped blades, which improve both self start behavior and mechanical power output, although such improvements are reported to be most effective only up to a tip speed ratio (TSR) of 2 compared to conventional airfoils. In this study, the concept of J shaped blades is adapted to a hydrokinetic turbine combined with a cascaced configuration to optimize performance. The blade ratiodefined by the leading edge offset relative to the chord length varies from 10% to 40%, with blade counts of 3, 6, and 9. CFD simulations are conducted across operating flow velocities ranging from 0.5 m/s to 3.0 m/s. Results show that increasing the number of blades lowers the turbine’s rotational speed due to higher inertia and drag, but it significantly enhances torque and mechanical power coefficient. Conversely, increasing the J-shaped blade ratio tends to raise the turbine’s rotational speed, though the effect on torque and power coefficient varies depending on operating conditions. At the highest tested velocity of 3 m/s, the mechanical power coefficient increases consistently with higher J shaped blade ratios from 10% to 40%, highlighting the potential of combining J shaped blades and cascaced configurations to improve hydrokinetic turbine performance.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Hidrokinetik, Turbin, J Shaped, Self Start, Daya, Hydrokinetic, Turbine, J Shaped, Self Start Power
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General)
Divisions:	Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Arif Wardana
Date Deposited:	30 Jul 2025 09:07
Last Modified:	30 Jul 2025 09:07
URI:	http://repository.its.ac.id/id/eprint/123805

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