Studi Numerik Turbin Angin Savonius Sudu Bach Dengan Variasi Overlap dan Penambahan Plat

Fajri, Hasnatiwi Karina (2020) Studi Numerik Turbin Angin Savonius Sudu Bach Dengan Variasi Overlap dan Penambahan Plat. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Energi merupakan suatu kebutuhan dasar untuk kelangsungan hidup manusia. Kebutuhan energi untuk menunjang hidup manusia pun semakin meningkat seiring dengan berjalannya waktu, terutama energi listrik. Namun, sebagian besar pembangkit listrik yang ada di Indonesia masih menggunakan bahan bakar fosil sebagai sumber energinya, di mana bahan bakar fosil merupakan salah satu sumber energi tak terbarukan yang suatu saat akan habis dan juga tidak ramah lingkungan. Maka dari itu diperlukan alternatif lain untuk menggantikan energi fosil. Salah satu energi terbarukan yang dapat digunakan dan dikembangkan, terutama di Indonesia, yaitu energi angin. Turbin angin Savonius merupakan turbin angin vertikal dengan bentuk sudu setengah silinder yang dipasang dengan arah berlawanan. Turbin angin Savonius yang akan dianalisa yaitu turbin angin Savonius tipe sudu Bach. Berdasarkan penelitian-penelitian terdahulu, didapatkan bahwa turbin Savonius tipe sudu Bach menghasilkan performa yang sama dan bahkan lebih baik dari turbin Savonius standard. Dalam penelitian ini dilakukan analisa terhadap overlap pada turbin angin Savonius sudu Bach serta adanya penambahan plat untuk mendapatkan performa turbin yang paling optimal.Metode yang digunakan pada studi ini yaitu studi numerik dengan dua dimensi pada turbin dinamis dengan aliran unsteady dan incompressible, yang menggunakan software ANSYS FLUENT. Bentuk geometri yang dianalisa yaitu turbin angin Savonius tipe Bach dengan sudut sudu sebesar 135° dengan kondisi rotor berputar. Turbulance model yang digunakan adalah SST k-ω. Kecepatan yang digunakan yaitu konstan pada 4 m/s. Boundary condition yang digunakan pada inlet yaitu velocity inlet, pada outlet digunakan outflow, pada sisi paling atas dan bawah digunakan symmetry, dan untuk turbin diatur sebagai wall. Hasil penelitian menunjukkan pada kecepatan 4 m/s, adanya overlap mempengaruhi torsi yang dihasilkan oleh turbin. Turbin tipe Bach dengan overlap ratio sebesar 0.15 dapat menghasilkan nilai coefficient of torque yang lebih tinggi dari turbin tipe Bach tanpa overlap dengan posisi sudut putar maksimum pada 15°. Untuk coefficient of torque minimum yang didapat antara turbin Bach tanpa overlap dan kedua turbin Bach dengan overlap ratio sebesar 0.15 memiliki selisih yang cukup besar. Dengan nilai coefficient of torque paling rendah didapat pada turbin dengan overlap ratio 0.15 dan penambahan plat di posisi sudut putar 105°. Coefficient of power paling tinggi dihasilkan oleh turbin Bach dengan overlap ratio 0.15 dan penambahan plat, yaitu sebesar 0.33 pada TSR = 0.9. Sedangkan coefficient of power untuk turbin Bach tanpa overlap yaitu sebesar 0.24 pada TSR = 0.7. Dan untuk turbin Bach dengan overlap ratio 0.15 tanpa penambahan plat didapatkan coefficient of power sebesar 0.29 pada TSR = 0.8. ====================================================================================================================== Energy is a basic need for human survival. The energy needed to support human life is increasing as time goes by, especially electrical energy. However, most of the power plants in Indonesia still use fossil fuels as their energy source, where fossil fuels are one of the non-renewable energy sources that will eventually run out, and are also not environmentally friendly. Therefore, another alternative is needed to replace fossil energy. One of the renewable energies that can be used and developed, especially in Indonesia, is wind energy. The Savonius wind turbine is a vertical wind turbine with a half-cylinder blade that is mounted in the opposite direction. The Savonius wind turbine that will be analyzed is the Bach blade Savonius wind turbine. Based on previous studies, it was found that the Bach blade Savonius turbine produced the same and even better performance than the standard Savonius turbine. In this research, an analysis of overlap in Savonius Bach blades wind turbines and the addition of plates to get the most optimal turbine performance. The method used in this study is a two-dimensional numerical study of a dynamic turbine with unsteady and incompressible flow, using ANSYS FLUENT software. The geometric shape analyzed is the Bach type Savonius wind turbine with a blade angle of 135° with rotating rotor conditions. The turbulance model used is SST k-ω. The velocity used is constant at 4 m/s. The boundary condition used for the inlet is the velocity inlet, the outflow is used at the outlet, the symmetry on the top and bottom sides, and the turbine is set as a wall. The results showed that at a speed of 4 m/s, the overlap affected the torque generated by the turbine. The Bach type turbine with an overlap ratio of 0.15 can produce a higher coefficient of torque value than the Bach type turbine without overlap, with the maximum value at angle position of 15°. The minimum coefficient of torque obtained between the Bach turbine without overlap and the two Bach turbines with an overlap ratio of 0.15 has a large difference. With the lowest coefficient of torque, the turbine is obtained with an overlap ratio of 0.15 and the addition of a plate in a position of rotation angle of 105°. The highest coefficient of power is produced by Bach turbines with an overlap ratio of 0.15 and plate addition, which is 0.33 at TSR = 0.9. While the coefficient of power for Bach turbines without overlap is 0.24 at TSR = 0.7. And for Bach turbines with an overlap ratio of 0.15 without the addition of plates, the coefficient of power is 0.29 at TSR = 0.8.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Bach, Coefficient Of Power, Coefficient Of Torque, Savonius, Torsi, Torque
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ828 Wind turbines
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Hasnatiwi Karina Fajri
Date Deposited: 18 Aug 2020 06:43
Last Modified: 18 Aug 2020 06:43
URI: https://repository.its.ac.id/id/eprint/78595

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