Rahman, Fauzan Ichsanul (2022) Studi Numerik Pengaruh Penambahan Silinder Pengganggu Di Depan Sudu Returning (S/D) Dan Silinder Di Samping Sudu Advancing (Y/D) Terhadap Peningkatan Performa Turbin Savonius “Studi Kasus d/D = 0,5; dengan jarak S/D = 1,61 dan 1,71; Y/D = 1,61 dan 1,71”. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia merupakan salah satu negara dengan jumlah penduduk terbesar di dunia. Rata�rata peningkatan jumlah penduduk Indonesia mencapai 1,25 % setiap tahunnya. Kebutuhan energi diproyeksikan mengalami peningkatan rata-rata sebesar 4.2% per tahun. Kebutuhan energi saat ini masih bergantung pada bahan bakar fosil. Hal ini kontradiktif dengan pasokan minyak bumi yang terus menurun sebesar 3.5% setiap tahunnya. Energi baru dan Terbarukan (EBT) merupakan salah satu solusi untuk mengatasi ketergantungan terhadap energi fosil. Salah satu yang dapat dijadikan sumber energi alternatif adalah Energi Angin. Potensi pemanfaatan energi angin di Indonesia mencapai 60.647 MW. Iklim Indonesia yang memiliki kecepatan angin berkisar 3–6 m/s, Vertical Axis Wind Turbine (VAWT) jenis turbin Savonius merupakan jenis turbin yang cocok digunakan. Namun daya yang dihasilkan oleh turbin Savonius cukup rendah. Penelitian mengenai peningkatan performa turbin Savonius dilakukan dengan penambahan silinder. Penambahan silinder didepan sudu returning dan disamping sudu advancing diharapkan akan mendefleksikan angin dan menghasilkan torsi positif lebih tinggi sehingga akan meningkatkan coefficient of power dari turbin sehingga performa turbin akan meningkat Penelitian ini dilakukan dengan metode komputasi numerik menggunakan software ANSYS Fluent 2021R2 dengan tiga tahapan, yaitu pre-processing, processing, dan post-processing. Penelitian ini menggunakan tipe turbin angin Savonius dengan penambahan silinder pengganggu di depan sudu returning dan di samping sudu advancing. Penelitian ini dilakukan dengan turbulence model menggunakan k-ε realizable. Domain yang digunakan terdiri atas stationary dan rotary domain karena dilakukan dalam kondisi turbin yang berputar. Kecepatan inlet yang digunakan adalah konstan 4 m/s. Boundary condition yang digunakan untuk sudu turbin adalah wall, untuk inlet menggunakan velocity-inlet, untuk outlet menggunakan pressure-outlet, untuk simetri menggunakan symmetry, dan untuk interface sisi rotasi dan sisi statis menggunakan interface. Hasil penelitian yang diperoleh dari simulasi yang dilakukan pada konfigurasi turbin angin Savonius dengan penambahan silinder di samping sudu advancing dengan variasi jarak Y/D = 1,61 dan Y/D = 1,71 mampu menaikkan performa dari turbin dengan kenaikan sebesar 13,3 % dan 5,9%. Penambahan silinder memberikan efek nozzle dan membuat pengaruh attach flow yang meningkat kecepatannya pada sisi cembung advancing blade. Sedangkan untuk konfigurasi turbin angin Savonius dengan penambahan di samping sudu advancing (Y/D) dan di depan sudu
returning (S/D) pada konfigurasi Y/D = 1,61; S/D = 1,61 dan Y/D = 1,71; S/D = 1,71 mampu menaikkan performa turbin sebesar 4% dan 2,4%. Penambahan silinder di depan sudu returning menurunkan tekanan di sisi cembung returning dan penambahan silinder memberikan efek nozzle dan membuat pengaruh attach flow yang meningkat kecepatannya pada sisi cembung advancing blade.
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Indonesia is one of the largest population countries in the world. The average increase in Indonesia's population reaches 1.25% every year. Energy demand is projected to increase by an average of 4.2% per year. Current national energy needs still depend on fossil fuels. This is in contradictory to the supply of crude oil which continues to decline by 3.5% per year. Renewable Energy is one of the solutions to overcome dependence on fossil energy. One of the renewable energies is wind energy. The potential utilization of wind energy in Indonesia reaches 60,647 MW. Indonesia's climate has wind speeds ranging from 3–6 m/s, the Vertical Axis Wind Turbine (VAWT) type of Savonius turbine is the type of turbine that is suitable to use. However, the power generated by the Savonius turbine is quite low. Research on increasing the performance of the Savonius turbine has been carried out, one of them is the addition of a cylinder. The addition of cylinders is expected to increase the turbine power coefficient so that the turbine performance will increase. This research was conducted using a numerical computation method using the ANSYS Fluent 2021R2 software with three stages, pre-processing, processing, and post-processing. This research uses a Savonius wind turbine with the addition of a cylinder near the returning blades and near the advancing blades. This research was conducted using a turbulence model using k-ε Realizable. The domain used consists of two parts, the stationary domain and the rotary domain because it is carried out in a rotating turbine condition. The inlet speed is constant at 4 m/s. The boundary conditions used for turbine blades are wall, the inlet is velocity-inlet, pressure-outlet for outlet, and symmetry for interface for rotational and static domain interfaces The results obtained from simulations show that the configuration of the Savonius wind turbine with the addition of a cylinder near the advancing blade with variations in distance Y/D = 1.61 and Y/D = 1.71 able to provide increased performance of the turbine with an increase of 13.3% and 5.9%. The addition of a cylinder provides a nozzle effect and creates an attach flow effect which increases its speed on the convex side of the advancing blade. As for the configuration of the Savonius wind turbine with the addition near the advancing blades (Y/D) and near the returning blades (S/D) in the configuration Y/D = 1.61; S/D = 1.61 and Y/D = 1.71; S/D = 1.71 able to increase turbine performance by 4% and 2.4%, respectively. The addition of a cylinder near the returning blade reduces the pressure on the convex side of the returning blade and the addition of a cylinder gives a nozzle effect and creates an attach flow effect which increases its speed on the convex side of the advancing blade.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 621.406 Rah s-1 2022 |
| Uncontrolled Keywords: | : turbin angin Savonius, simulasi numerik, boundary condition, coefficient of power, coefficient of moment |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TJ Mechanical engineering and machinery > TJ828 Wind turbines |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 26 Feb 2025 01:35 |
| Last Modified: | 26 Feb 2025 01:35 |
| URI: | http://repository.its.ac.id/id/eprint/118897 |
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