GUNAWAN, HARDI (2025) ANALISIS TUNNEL DIFFUSER TERHADAP PENINGKATAN RPM TURBIN GORLOV DENGAN SIMULASI COMPUTATIONAL FLUID DYNAMIC. S2 thesis, Universitas Mercu Buana Jakarta.
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Abstract
The Gorlov turbine is one type of turbine that can be applied in ocean current power plants as a sustainable energy solution, particularly in Indonesia, which has significant potential due to its geographical characteristics. However, the use of ocean current turbines still faces challenges with low efficiency. This study aims to analyse the effect of applying a tunnel diffuser on the performance improvement of the Gorlov turbine, focusing on parameters such as fluid flow velocity and turbine rotation (RPM). The method employed is a numerical simulation based on Computational Fluid Dynamics (CFD), utilising SolidWorks Flow Simulation software. The tunnel diffuser design features three geometric angles: 20°, 30°, and 40°, and is tested at four different ocean current velocities: 0.5 m/s, 1.0 m/s, 1.5 m/s, and 2.0 m/s. The simulation results indicate that the 30° angle yields the best efficiency, with fluid velocity increasing by up to 140% at an initial current velocity of 0.5 m/s, and the highest RPM reaching 382.16 at 2.0 m/s. This study demonstrates that the 30° tunnel diffuser design is the most optimal in significantly improving the efficiency of the Gorlov turbine and can be implemented in ocean current power systems in Indonesia. Keywords: tunnel diffuser, Gorlov turbine, CFD, RPM, ocean current power plant, renewable energy. Turbin Gorlov adalah salah satu jenis turbin yang berpotensi diterapkan pada pembangkit listrik tenaga arus laut sebagai solusi energi terbarukan, khususnya di Indonesia yang memiliki potensi besar dari karakteristik geografisnya. Namun, penggunaan turbin arus laut masih menghadapi tantangan efisiensi yang rendah. Penelitian ini bertujuan untuk menganalisis pengaruh penerapan tunnel diffuser terhadap peningkatan performa turbin Gorlov, dengan fokus pada parameter kecepatan aliran dan putaran turbin (RPM). Metode yang digunakan adalah simulasi numerik berbasis Computational Fluid Dynamics (CFD) dengan perangkat lunak SolidWorks Flow Simulation. Desain tunnel diffuser divariasikan pada tiga sudut geometri, yaitu 20°, 30°, dan 40°, serta diuji pada empat kecepatan arus laut: 0,5 m/s, 1,0 m/s, 1,5 m/s, dan 2,0 m/s. Hasil simulasi menunjukkan bahwa sudut 30° memberikan efisiensi terbaik, dengan peningkatan kecepatan arus hingga 140% pada kecepatan arus 0,5 m/s dan RPM tertinggi mencapai 382,16 pada kecepatan arus 2,0 m/s. Penelitian ini membuktikan bahwa desain tunnel diffuser sudut 30° adalah yang paling optimal dalam meningkatkan RPM turbin Gorlov secara signifikan dan dapat diimplementasikan pada sistem pembangkit arus laut di wilayah Indonesia. Kata kunci: tunnel diffuser, turbin Gorlov, CFD, RPM, PLTAL, energi terbarukan.
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