Sri, Lestari (2023) Karakterisasi Arus Setelah Gelombang Pecah dan Analisis Kinerja Turbin untuk Pembangkitan Energi: Studi Kasus di Pantai Pacitan, Jawa Timur. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Laut sisi selatan Indonesia berhadapan dengan Samudera Hindia. Hal ini merupakan faktor utama yang menyebabkan pantainya memiliki potensi energi gelombang pecah yang tinggi di sepanjang tahun. Selanjutnya, energi arus setelah gelombang pecah diketahui memiliki kecepatan yang tinggi pada tipe pantai dengan Surging breaker yang mendominasi. Penelitian saat ini berfokus untuk melakukan karakterisasi arus setelah gelombang pecah dengan pengukuran lapangan di Pacitan, Jawa Timur, Indonesia. Karakterisasi tersebut bertujuan untuk pembangkitan energi listrik didekat pantai. Untuk mengetahui karakter dari energi ini, selama 25 jam dilakukan survei hidro-oseanografi dengan mengoperasikan ADCP dan Current Meter dalam waktu bersamaan sehingga diperoleh sampel data gelombang dan arus. ADCP digunakan untuk memperoleh data gelombang dan arus laut sebelum gelombang pecah (Hs, Tp, v). Current Meter digunakan untuk memperoleh data arus laut setelah gelombang pecah (ca, U). Instantaneous velocity dari arus absolut atau arus datang, ca, dan arus balik, U, mencapai nilai 2-3 m/s dengan kecepatan rata-rata 0,7-1,3 m/s. Selanjutnya, diketahui bahwa parameter wave steepness at breaking point, HB/gTp2, berbanding lurus dengan parameter wave celerity at breaking point, c2/ghB, dan parameter absolute velocity due to breaking waves (at x/H_B = 19/3 ), (ca)2/ghCM. Model komputasi numerik digunakan untuk simulasi di berbagai variasi rasio diameter inlet (D1) dan diameter outlet (D2), D1/D2, dengan kecepatan inlet yang seragam, dan perhitungan waktu transien. Digunakan κ-ε (2 enq) standar dengan wall function turbulence enclosure model. Hasil komputasi menyampaikan nilai MAPE sebesar 13,3%. Dari analisis ini, D1/D2 1,69 merupakan variasi yang paling optimal untuk meningkatkan nilai ekstraksi energi turbin kasus dasar, Pt, dari 36 W/s menjadi 790 W/s.
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The southern sea of Indonesia faces the Indian Ocean. This is the main factor of causes the beach to have a high potential from breaking wave energy throughout the year. Furthermore, current energy due to breaking waves has a relatively high velocity at the shore with a Surging dominated breaker. The research focuses at characterize the current due to breaking waves by field measurements in Pacitan shore, East Java, Indonesia. The characterization aims to generate electrical energy near the coast. To characterize the current resulting from breaking waves, a hydro-oceanographic survey was carried out for 25 hours by operating the ADCP and Current Meter at the same time to obtain wave and current data samples. ADCP was used to obtain wave and current data before the wave breaks (Hs, Tp, v). The Current Meter was used to obtain current data after the wave breaks (ca, U). The instantaneous velocities of the absolute currents, ca, and the return currents, U, reach values of 2-3 m/s with an average velocity of 0,7-1,3 m/s. It is known that the parameter of wave steepness at the breaking point, HB/gTp2, is directly proportional to the parameter of wave celerity at the breaking point, c2/ghB, and the parameter of absolute velocity due to breaking waves (at x/H_B = 19/3 ), (ca)2/ghCM. Computational fluid dynamic tool were used for the simulations at various ratios of inlet diameter (D1) and outlet diameter (D2), D1/D2, with a uniform inlet velocity, and transient time calculation. The standard κ-ε (2 enq) with a wall function turbulence enclosure model was selected. MAPE reach value of 13,3%. From this analysis, D1/D2 with a value of 1,69 is the most suitable to increase energy extraction from the base case turbine, Pt, from 36 W/s to 790 W/s.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Energi terbarukan, Hidrodinamika, Gelombang pecah, Teknik pantai, Kinerja turbin, Renewable energy, Hydrodynamics, Breaking wave, Coastal engineering, Turbine performance |
| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography Q Science > QA Mathematics > QA911 Fluid dynamics. Hydrodynamics T Technology > TC Hydraulic engineering. Ocean engineering > TC147 Ocean wave power. T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis |
| Depositing User: | Sri Lestari |
| Date Deposited: | 02 Feb 2023 01:47 |
| Last Modified: | 02 Feb 2023 01:47 |
| URI: | http://repository.its.ac.id/id/eprint/95829 |
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