Studi Penggunaan Flow Disturber pada Turbin Arus Laut Sumbu Vertikal Tipe Darrieus

Yasim, Ahmad (2019) Studi Penggunaan Flow Disturber pada Turbin Arus Laut Sumbu Vertikal Tipe Darrieus. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Turbin Darrieus adalah jenis turbin yang cocok dikembangkan di perairan Indonesia karena mampu mengekstraksi arus laut dari berbagai arah dan bekerja pada kecepatan arus yang lebih rendah dibandingkan jenis turbin lain. Namun, turbin Darrieus memiliki kekurangan seperti performa turbin yang relatif rendah. Berbagai modifikasi bentuk turbin terbukti dapat meningkatkan performa turbin namun berdampak pada kerumitan konstruksi, bertambahnya beban hidrodinamik dan biaya produksi yang lebih mahal. Penambahan flow disturber pada turbin Darrieus dapat meningkatkan performa turbin tanpa memodifikasi bentuk turbin. Hal ini terjadi karena flow disturber dapat memicu aliran menjadi turbulensi yang mana dapat meningkatkan daya turbin dan koefisien thrust lebih dari 10%. Untuk mengetahui pengaruh flow disturber terhadap performa turbin maka dilakukan pemodelan numerik berbasis computational fluid dynamics (CFD). Pemodelan numerik perlu divalidasi dengan hasil experimen sebagai tahap awal, kemudian melakukan simulasi numerik pengaruh jarak antara flow disturber dengan turbin terhadap performa yang dihasilkan. Variasi jarak flow disturber adalah 0.75D, 1D, 1.5D dan 2D dimana D adalah diameter turbin. Hasil simulasi didapatkan bahwa flow disturber pada jarak 1.5D dan 2D belum mampu meningkatkan performa turbin, sedangkan pada jarak 0.75D dan 1D flow disturber dapat meningkatkan performa turbin. Penggunaan flow disturber jarak 0.75D dapat meningkatan Cp sebesar 11.5% pada TSR 1.5.
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Darrieus turbine is a one of vertical axis turbine type that suitable to be developed in Indonesian tidal current because it is able to extract ocean currents from various directions and work at lower current speeds than other types of turbines. However, the Darrieus turbine has disadvantages such as having relatively low turbine performance. Various modifications of turbine shape have resulted in increasing turbine performance but have an impact on the complexity of construction, increased hydrodynamic loads and more expensive production costs. Attached flow disturber to the Darrieus turbine can improve turbine performance without modifying the turbine shape. This happens because the flow disturber can trigger the flow into turbulence which can increase turbine power and thrust coefficient by more than 10%. To determine the effect of flow disturber on the turbine performance, numerical modeling based on computational fluid dynamics (CFD) is performed. Numerical modeling needs to be validated with the turbine experiment result before doing a numerical simulation of the distance effect of the flow disturber from the turbine against the performance result. The variation of the flow disturber distance is 0.75D, 1D, 1.5D and 2D where D is the diameter of the turbine. Simulation results show that flow disturber at a distance of 1.5D and 2D has no significant effect to improve turbine performance, while at a distance of 0.75D and 1D flow disturber can improve turbine performance. The use of flow disturber at distance 0.75D can increase Cp by 11.5% at TSR 1.5.

Item Type:	Thesis (Masters)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TC Hydraulic engineering. Ocean engineering > TC147 Ocean wave power.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis
Depositing User:	Ahmad Yasim
Date Deposited:	23 Jul 2026 20:21
Last Modified:	23 Jul 2026 20:21
URI:	http://repository.its.ac.id/id/eprint/72479

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