Suwarno, Fisko Albatinusa (2021) Analisis Pengaruh Rasio Diameter Flow Disturbance Terhadap Performa Turbin Darrieus. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Turbin Darrieus merupakan turbin tipe VAWT yang memiliki salah satu kekurangan pada kemampuan self-start. Self-start berkaitan erat dengan kecepatan aliran fluida terendah dimana turbin dapat berputar (cut in speed). Pada penelitian ini performa turbin darrieus diuji pada kondisi kecepatan arus air rendah. Tujuan dari penelitian ini adalah untuk mengetahui dan memilih konfigurasi flow disturbance yang dapat meningkatkan performa turbin Darrieus pada kecepatan rendah. Pemodelan numerik dilakukan dengan menggunakan metode CFD menggunakan Fluent Ansys 18.1 yang menggunakan teknik sliding mesh dengan model turbulence K-ω SST. Menganalisis performa turbin darrieus dengan memanfaatkan flow disturbance berbentuk silinder yang ditempatkan di depan turbin pada tiga variasi posisi silinder. Selanjutnya melakukan variasi rasio diameter silinder ds/D 0,1, 0,3, 0,5, dan 0,7 untuk mengetahui rasio diameter terbaik yang meningkatkan performa turbin paling optimal. Variasi tersebut juga akan disimulasikan pada tiap kecepatan 0,3 m/s, 0,4 m/s, 0,5 m/s, dan 0,6 m/s. Hasil yang didapatkan adalah flow disturbance memiliki pengaruh yang dapat mengganggu atau meningkatkan performa turbin bergantung pada posisi peletakan silinder. Hasil paling optimal terjadi pada posisi flow disturbance -600 pada TSR 1,43 dengan rasio diameter ds/D 0,5. Peningkatan nilai coefficient power (Cp) maksimum tersebut sebesar 38%. Pada kecepatan arus beragam dengan rentang 0,3 m/s – 0,6 m/s penggunaan rasio diameter ds/D terbaik adalah pada ds/D 0,5 dengan rata-rata peningkatan Cp sebesar 30%.
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Darrieus turbines are VAWT type turbines that have one of the drawbacks to self-start capability. Self-start is closely related to the lowest fluid flow speed at which the turbine can be cut in speed. In this study, darrieus turbine performance was tested under low water current speed conditions. The purpose of this study was to find out and choose a flow disturbance configuration that could improve the performance of darrieus turbines at low speeds. Numerical modeling is done using CFD method using Fluent Ansys 18.1 which uses sliding mesh technique with turbulence model K-ω SST. Analyze the performance of the darrieus turbine by utilizing the cylinder-shaped flow disturbance placed in front of the turbine at three variations of cylinder position. Variations used in this study are the cylinder diameter ratios ds/D 0.1, 0.3, 0.5 and 0.7 to determine the best diameter ratio that improves turbine performance most optimally. The variation will also be simulated at each speed of 0.3 m/s, 0.4 m/s, 0.5 m/s, and 0.6 m/s. The result is that flow disturbance has an influence that can interfere with or improve turbine performance depending on the position of the cylinder laying. The most optimal result occurs at the flow disturbance position of -600 at TSR 1.43 with a diameter ratio of ds/D 0.5. The increase in the maximum coefficient power (Cp) value is 38%. At mixed current speeds with a range of 0.3 m/s – 0.6 m/s the best ds/D diameter ratio usage is at 0.5 ds/D with an average Cp increase of 30%.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | flow disturbance, coefficient power, darrieus, self-start, VAWT, turbine |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Fisko Albatinusa Suwarno |
| Date Deposited: | 16 Aug 2021 03:25 |
| Last Modified: | 16 Aug 2021 03:25 |
| URI: | http://repository.its.ac.id/id/eprint/87047 |
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