Studi Eksperimen Performa Turbin Arus Laut Savonius Tipe Crossflow Dengan Variasi Aspect Ratio (AR) Dan Kedalaman Instalasi

Wiyanto, Andreas Anthoni (2021) Studi Eksperimen Performa Turbin Arus Laut Savonius Tipe Crossflow Dengan Variasi Aspect Ratio (AR) Dan Kedalaman Instalasi. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangkit listrik energi arus air laut identik dengan turbin. Dengan mempertimbangkan karakteristik kecepatan arus laut di Indonesia yang rata-rata hanya 0,5 m/s, dipilihlah turbin arus laut Savonius tipe crossflow. Kelebihan turbin ini dapat bekerja pada kondisi kecepatan arus air laut rendah, namun kekurangannya terletak pada efisiensinya. Penelitian ini bertujuan untuk menguji performanya sebelum implementasi di lapangan. Seperti yang diketahui Aspect Ratio (AR) merupakan salah satu parameter non-dimensi yang menentukan kinerja dari turbin arus laut dengan perbandingan antara panjang dan diameter turbin, maka AR dengan nilai 1,145 dan 1,427 akan dibandingkan untuk mengetahui performa kinerjanya antara lain Coefficients of Power (CP), Coefficients of Torque (CQ), dan Tip-Speed Ratio (TSR). Selain itu, kedalaman level perendamannya di dalam air dan aplikasi dari deflector juga menjadi topik menarik untuk diteliti. Variasi keketatan tali juga ditambahkan dalam penelitian Tugas Akhir ini. Metode penelitian yang digunakan adalah studi eksperimen secara langsung di Umbulan, Pasuruan. Hasil yang didapat dari penelitian ini adalah turbin dengan AR lebih rendah (1,145) memiliki performa yang lebih baik jika dibandingkan dengan AR lebih tinggi (1,427). Pada Model T1 dengan AR 1,145 untuk pengujian tanpa deflector, ketika TSR mencapai nilai 0,824, mendapatkan nilai Coefficients of Torque (CQ) sebesar 0,327 dan nilai Coefficients of Power (CP) sebesar 0,269. Untuk pengujian dengan deflector pada model yang sama, ketika TSR mencapai nilai 1,1, mendapatkan nilai Coefficients of Torque (CQ) sebesar 0,251 dan nilai Coefficients of Power (CP) sebesar 0,276. Turbin dengan level kedalaman perendaman 80% tidak dapat diteliti karena salah satu blade tidak berperan sebagaimana mestinya. Sehingga analisis level kedalaman perendaman 100% menjadi tolak ukur penilaian performa turbin.
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Seawater current energy power plants are identical to turbines. Considering the characteristics of the ocean currents in Indonesia, which are only 0.5 m/s on average, the Savonius type crossflow turbine was chosen. The advantages of this turbine can work in conditions of low seawater current speed, but the drawback lies in its efficiency. This study aims to test its performance before implementation in the field. As known that Aspect Ratio (AR) is one of the non-dimensional parameters that determine the performance of the current ocean turbine with a comparison between the length and diameter of the turbine, then AR with values of 1.145 and 1.427 will be compared to determine the performance of the performance, including the Coefficients of Power (CP), Coefficients of Torque (CQ), and Tip-Speed Ratio (TSR). In addition, the depth level of immersion in water and the application of the deflector are also exciting topics for research. Variations in rope tension are also added to this final project. The research method used is a direct experimental study in Umbulan, Pasuruan. The results obtained from this study are that turbines with lower AR (1,145) have better performance when compared to higher AR (1,427). In Model T1 with AR 1.145 for testing without deflector, when TSR reaches a value of 0.824, it gets a Coefficients of Torque (CQ) value of 0.327 and a Coefficients of Power (CP) value of 0.269. For testing with a deflector on the same model, when the TSR reaches a value of 1.1, the Coefficients of Torque (CQ) value is 0.251, and the Coefficients of Power (CP) value is 0.276. A turbine with an immersion depth level of 80% could not be investigated because one of the blades was not working correctly. The analysis of the 100% immersion depth level becomes a benchmark for evaluating turbine performance.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Aspect Ratio (AR), Crossflow, Deflector, Performa, Performance, Savonius,
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering
Depositing User: Andreas Anthoni Wiyanto
Date Deposited: 14 Aug 2021 07:19
Last Modified: 14 Aug 2021 07:19
URI: http://repository.its.ac.id/id/eprint/86356

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