Sakti, Gunawan (2023) Investigasi Kinerja Turbin Angin Savonius Dengan Metode Pengontrol Silinder Sirkuler Dan Silinder Tipe I-65⁰ Staggered Sebagai Kontrol Pasif Aliran Pada Sudu ReturningG. Doctoral thesis, INSTITUT TEKNOLOGI SEPULUH NOPEMBER.
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Abstract
Turbin angin Savonius mempunyai banyak kelebihan dibandingkan yang lain karena konstruksinya sederhana dan murah, tidak tergantung dengan arah angin dan mempunyai torsi starter yang bagus pada kecepatan angin yang rendah. Meskipun demikian, tipe turbin angin ini mempunyai performa yang rendah dibanding dengan tipe-tipe turbin angin lainnya. Oleh sebab itu berbagai penelitian dilaksanakan untuk meningkatkan performa turbin Savonius. Penelitian ini ditujukan untuk meningkatkan performa turbin angin Savonius dengan instalasi silinder sirkuler dan silinder blluffbody tipe I-65⁰ dengan susunan staggered pada upstream returning blade. Penelitian dilakukan pada kecepatan 5 m/s dan sesuai dengan bilangan Reynolds sekitar 100.000. Jarak titik tengah antara silinder tipe I-65⁰ dan returning blade relatif terhadap diameter turbin S/D ditentukan tetap pada S/D=1.4. Diameter silinder sirkuler dan silinder tipe I-65⁰ relatif terhadap diameter sudu turbin adalah 0.5. Simulasi aliran unsteady 2D dilakukan menggunakan ANSYS Fluent, dan turbulence model yang digunakan adalah k-ε enhance wall function. Grid independence test dan validasi dilakukan untuk memastikan akurasi meshing dan pengaturan solver. Hasil eksperimen menunjukkan bahwa penempatan cylinder I-65° upstream returning blade dapat menaikkan performa turbin Savonius. Hal ini ditunjukan dengan installasi Silinder I-65° meningkatkan Cp maksimum turbin Savonius sekitar 12 %. CP puncak diperoleh pada TSR λ=0.8 dan sudut staggered α=0°. Sedangkan penambahan silinder sirkuler dapat menaikan Cp 29% pada sudut staggered α=70° dan TSR λ=0.8. Hasil pengukuran static torque juga menunjukan peningkatan optimal diperoleh pada sudut stagger α=0° untuk konfigurasi cilinder circular dan α=0° untuk silinder I-65°. Hasil validasi perhitungan numerik menunjukan kesepakatan yang baik terhadap data eksperimental dengan rata-rata percent gap ∆% untuk kongifurasi circular cylinder dan cylinder I-65° masing-masing adalah 4.7% dan 5.1%. Analisa data numerik Cd dan Cl pada sudut stagger optimal α=70° menunjukan penurunan sebesar 13% dan 10% masing-masing untuk drag turbin Savonius dengan installasi Cylinder I-65° dan circular cylinder dan untuk koefisien lift Cl menunjukan penurunan masing-masing 4% dan 5%. Hasil analisa kontur tekanan dan kontur kecepatan menunjukan adanya effect nozzle optimal pada sudut stagger α=70°.
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The Savonius wind turbine has many advantages over the others because it is simple and inexpensive in construction, independent of wind direction and has good starting torque at low wind speeds. However, this type of wind turbine has low performance compared to other types of wind turbines. Therefore, various studies were carried out to improve the performance of the Savonius turbine. This research aims to improve the performance of the Savonius wind turbine with the installation of circular cylinders and type I-65⁰ bluffbody cylinders with a staggered arrangement on the upstream returning blade. The research was carried out at a speed of 5 m/s, according to the Reynolds number of about 100,000. The midpoint distance between the cylinder type I-65⁰ and the returning blade relative to the turbine diameter S/D is fixed at S/D=1.4. The diameter of the circular cylinder and type I-65⁰ cylinder relative to the turbine blade diameter is 0.5. The unsteaddy flow 2D simulations were conducted using ANSYS Fluent, and the turbulence model used was realizable k-ε enhance wall function. Grid independence tests and validation were performed to ensure meshing and solver setup accuracy. The experimental results show that placing cylinder I-65° upstream from the returning blade can increase the performance of the Savonius turbine. This is shown by the addition of the I-65° cylinder increasing the maximum Cp of the Savonius turbine by about 12%. Peak Cp was obtained at TSR λ=0.8 and staggered angle α=0°. Meanwhile, the addition of a circular cylinder can increase Cp 29% at a staggered angle of α=70° and TSR λ=0.8. The validation results of numerical calculations show good agreement with experimental data with an average percent gap ∆% for circular cylinder and cylinder I-65° configurations of 4.7% and 5.1%, respectively. Cd and Cl numerical data analysis at optimal stagger angle α=70° shows a decrease of 13% and 10%, respectively, for the Savonius drag turbine with Cylinder I-65° and circular cylinder installation, and for the lift coefficient Cl shows a decrease of 4 % and 5% respectively. The results of the analysis of pressure contours and velocity contours show that there is an optimal nozzle effect at stagger angle α=70°.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | I-65o type cylinder, Savonius wind turbine performance, upstream of the returning blade |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ1058 Rotors T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General) T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. T Technology > TJ Mechanical engineering and machinery > TJ828 Wind turbines |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21001-(S3) PhD Thesis |
| Depositing User: | GUNAWAN SAKTI |
| Date Deposited: | 11 Aug 2023 04:12 |
| Last Modified: | 11 Aug 2023 04:12 |
| URI: | http://repository.its.ac.id/id/eprint/104609 |
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