Studi Perancangan Nozzle Diffuser Cross Flow Marine Turbine Pada Skala Laboratorium Untuk Aplikasi Electric Fish Boat <1 GT

Ahmadi, Hibatillah Aufa Fahmi (2026) Studi Perancangan Nozzle Diffuser Cross Flow Marine Turbine Pada Skala Laboratorium Untuk Aplikasi Electric Fish Boat <1 GT. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemanfaatan energi arus laut sebagai sumber energi terbarukan merupakan salah satu alternatif untuk mendukung kebutuhan energi pada kapal nelayan skala kecil. Penelitian ini bertujuan untuk menganalisis performa desain nozzle diffuser cross flow marine turbine melalui variasi jumlah bilah turbin terhadap nilai putaran (RPM), torsi, dan efisiensi turbin pada skala laboratorium. Variasi Di/Do yang digunakan yaitu sebesar 0,5 (14 blade, 16 blade, 16 blade desain hollow) dan sebesar 0,7 (20 blade dan 22 blade), dengan kecepatan arus 5 knot, 7,5 knot, dan 10 knot. Parameter yang dianalisis meliputi RPM, torsi, kecepatan sudut, daya mekanik, daya air, dan efisiensi turbin. Hasil pengujian menunjukkan bahwa nilai RPM berkisar antara 79–306 RPM, sedangkan torsi yang dihasilkan berada pada rentang 0,303–0,582 N.m. Nilai efisiensi turbin untuk variasi 14 blade berada pada kisaran 4,32–8,64%, 16 blade sebesar 4,51–9,46%, dan 16 blade desain hollow sebesar 1,86–3,83%. Sementara itu, turbin 20 blade dan 22 blade tidak menghasilkan putaran pada seluruh variasi kecepatan arus sehingga tidak dapat dilakukan analisis performa. Berdasarkan hasil pengujian, konfigurasi 16 blade memberikan performa terbaik dengan efisiensi maksimum sebesar 9,46% pada kecepatan arus 10 knot, sehingga menunjukkan bahwa jumlah bilah dan konfigurasi turbin berpengaruh terhadap kemampuan konversi energi aliran air menjadi energi mekanik.
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The utilization of marine current energy as a renewable energy source is a promising alternative to support the energy needs of small scale fishing vessels. This study aims to analyze the performance of a nozzle diffuser cross flow marine turbine by investigating the effect of turbine blade number on rotational speed (RPM), torque, and turbine efficiency through laboratory scale experiments. The Di/Do ratios used in this study were 0.5 (14 blade, 16 blade, and 16 blade hollow design turbines) and 0.7 (20 blade and 22 blade turbines), with flow velocities of 5 knots, 7.5 knots, and 10 knots. The performance parameters analyzed included rotational speed (RPM), torque, angular velocity, mechanical power, water power, and turbine efficiency. The experimental results showed that the rotational speed ranged from 79 to 306 RPM, while the generated torque ranged from 0.303 to 0.582 N·m. The turbine efficiency ranged from 4.32% to 8.64% for the 14 blade configuration, 4.51% to 9.46% for the 16 blade configuration, and 1.86% to 3.83% for the 16 blade hollow design configuration. Meanwhile, the 20 blade and 22 blade turbines did not rotate under any of the tested flow velocities; therefore, their performance could not be evaluated. Based on the experimental results, the 16 blade configuration exhibited the best performance, achieving a maximum turbine efficiency of 9.46% at a flow velocity of 10 knots. These findings indicate that both the blade number and turbine configuration significantly influence the conversion of water flow energy into mechanical energy.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Cross Flow Marine Turbine, Efisiensi Turbin, Nozzle Diffuser, RPM, Torsi, Cross Flow Marine Turbine, Turbine Efficiency, Nozzle Diffuser, RPM, Torque.
Subjects:	V Naval Science > VM431 Fishing boats
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Hibatillah Aufa Fahmi Ahmadi
Date Deposited:	03 Aug 2026 05:17
Last Modified:	03 Aug 2026 05:17
URI:	http://repository.its.ac.id/id/eprint/142061

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