Analisis Pengaruh Modifikasi Geometri Sudu terhadap Performa Turbin Angin Savonius Dua Sudu Menggunakan Simulasi CFD

Abiyoga, Najwan Raditya (2026) Analisis Pengaruh Modifikasi Geometri Sudu terhadap Performa Turbin Angin Savonius Dua Sudu Menggunakan Simulasi CFD. UNSPECIFIED thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Turbin angin tipe Savonius merupakan salah satu jenis turbin angin sumbu vertikal yang cocok untuk kondisi kecepatan angin rendah. Turbin Savonius memiliki beberapa kelebihan, namun juga terdapat kekurangan yaitu efisiensi yang masih tergolong rendah akibat gaya hambat (drag) yang terjadi pada returning blade. Salah satu pendekatan untuk meningkatkan performa turbin adalah melalui modifikasi geometri sudu. Penelitian ini bertujuan untuk menganalisis pengaruh modifikasi geometri sudu terhadap performa turbin angin Savonius dua sudu melalui simulasi Computational Fluid Dynamics (CFD) dua dimensi menggunakan model turbulensi SST k-ω. Tiga variasi sudu yang dikaji meliputi sudu konvensional (semicircular), modifikasi pertama dengan penambahan bagian sudu lurus, dan modifikasi kedua dengan penambahan bagian sudu lurus yang lebih panjang pada bagian yang mendekati poros turbin dengan overlap. Diameter turbin dijaga konstan pada 600 mm untuk seluruh variasi. Simulasi dilakukan pada kecepatan angin 6 m/s (Re = 2,46 × 10⁵) dengan variasi tip speed ratio (TSR) antara 0,2 hingga 1,4. Parameter performa yang dianalisis meliputi koefisien momen (CM) terhadap TSR, koefisien daya (CoP) terhadap TSR, koefisien momen (CM) terhadap sudut azimuth (θ), serta karakteristik aliran berupa distribusi tekanan dan kontur kecepatan. Hasil simulasi menunjukkan bahwa penambahan bagian sudu lurus meningkatkan gaya drag pada kedua sisi sudu secara proporsional, sehingga terdapat trade-off antara peningkatan torsi pada TSR rendah dan efisiensi konversi daya. Turbin konvensional menghasilkan CoP maksimum tertinggi sebesar 0,320 pada TSR 1,0, dibandingkan modifikasi 2 dan modifikasi 1 yang masing-masing sebesar 0,309 dan 0,240. Namun demikian, kedua variasi modifikasi menghasilkan nilai CM maksimum yang lebih tinggi dibandingkan turbin konvensional, dengan modifikasi 2 mencapai nilai tertinggi sebesar 0,823, yang dikonfirmasi oleh analisis aliran berupa perluasan zona tekanan stagnasi pada advancing blade.
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The Savonius wind turbine is one type of vertical axis wind turbine that is well-suited for low wind speed conditions. The Savonius turbine has several advantages, but it also has a drawback, namely its relatively low efficiency due to the drag force occurring on the returning blade. One approach to enhancing turbine performance is through the modification of blade geometry. This study aims to analyze the effect of blade geometry modification on the performance of a two-bladed Savonius wind turbine by means of two-dimensional Computational Fluid Dynamics (CFD) simulation using SST k-ω turbulence model. Three blade configurations were examined, namely the conventional semicircular blade, the first modification incorporating an additional straight blade section, and the second modification featuring a longer straight blade section positioned closer to the turbine shaft with overlap. The turbine diameter was maintained constant at 600 mm across all configurations. Simulations were performed at a wind speed of 6 m/s (Re = 2,46 × 10⁵) with tip speed ratio (TSR) values ranging from 0,2 to 1,4. The performance parameters evaluated include the coefficient of moment (CM) as a function of TSR, coefficient of power (CoP) as a function of TSR, coefficient of moment (CM) as a function of azimuth angle (θ), as well as flow characteristics comprising pressure distribution and velocity contours. The simulation results show that adding a straight blade section increases drag force proportionally on both blades, creating a trade-off between low-TSR torque and power conversion efficiency. The conventional turbine yields the highest maximum CoP of 0.320 at TSR 1,0, compared to 0,309 and 0,240 for the second and first modifications, respectively. However, both modified variants produce higher peak CM values than the conventional turbine, with the second modification achieving the highest at 0,823, supported by flow analysis showing an expanded stagnation pressure region on the advancing blade.

Item Type:	Thesis (UNSPECIFIED)
Uncontrolled Keywords:	savonius turbine, drag force, coefficient of moment, coefficient of power, tip speed ratio, turbin savonius, gaya drag, koefisien momen, koefisien daya, tip speed ratio
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General)
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Najwan Raditya Abiyoga
Date Deposited:	03 Aug 2026 07:09
Last Modified:	03 Aug 2026 07:09
URI:	http://repository.its.ac.id/id/eprint/141751

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