Studi Eksperimen Pengaruh Vortex Generator Terhadap Performa Foil Naca 0021 Untuk Turbin Arus Laut Dengan Variasi Chordwise Spacing

Farid, Mohammad (2024) Studi Eksperimen Pengaruh Vortex Generator Terhadap Performa Foil Naca 0021 Untuk Turbin Arus Laut Dengan Variasi Chordwise Spacing. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Konsumsi energi listrik perkapita kian meningkat tiap tahunnya, berdasarkan data Ditjen Ketenagalistrikan (2023) peningkatan terjadi sebesar 1.79% tiap tahunya. Dimana lebih dari 70% pembangkit listrik mengandalkan batubara dan minyak bumi, hanya 17% dari seluruh pembangkit listrik yang menggunakan energi EBT. Ditjen Ketenagalistrikan (2023) menyatakan potensi energi dari sumber air di Indonesia cukup besar yakni di angka 6808 MegaWatt. Penelitian terkait alat ekstraksi energi laut banyak dilakukan untuk memanfaatkan potensi maksimal dari sumber daya alam melalui peningkatan efisiensi pada teknologi, diantaranya yang paling umum digunakan adalah ocean turbine. Penelitian ini melibatkan studi eksperimen pada Airfoil model NACA 0021, memperkenalkan Vortex generator sebagai bentuk modifikasi geometri dengan tujuan untuk dapat meningkatkan nilai gaya angkat (lift force) dengan gaya hambat (drag force) seminim mungkin. Praktik eksperimen bertempat di Lab Aerodinamik Politeknik Penerbangan Surabaya menggunakan Wind Tunnel dengan Test-Section berukuran 600x600x1200 mm. Model foil NACA 0021 dicetak menggunakan bahan filamen 3D print dengan Aspect Ratio 2:1. Pengukuran menggunakan instrumentasi buatan berupa Loadcell dan fokus pengujian untuk melihat perubahan nilai koefisien angkat (lift) & hambat (drag) dari sudut serang 0 hingga 80 pada Reynolds Number 2x105. Vortex generator berbahan resin 3D print dengan variabel dasar h=0,41δ ; β=200 ; L=3,2h ; D=7h dan d=0,5D diuji untuk meninjau performa foil, dengan variasi nilai x/c = 5% merupakan desain optimum dimana mengakibatkan peningkatan performa Cl/Cd angkat sebesar 30.93% dari clean foil terjadi pada sudut serang 150 namun tidak menunjukan peningkatan pada pengaplikasian terhadap vertical turbine, sehingga tetap dibutuhkan analisa lebih lanjut.
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Per capita electricity consumption is increasing every year, according to data from the Directorate General of Electricity (2023). The increase is occurring at a rate of 1.79% each year. More than 70% of power plants rely on coal and petroleum, with only 17% of all power plants using Renewable Energy Sources (EBT). The Directorate General of Electricity (2023) states that the potential energy from water sources in Indonesia is significant, reaching 6808 MegaWatts. Numerous studies related to the extraction of energy from the sea are conducted to harness the maximum potential of natural resources through technology efficiency improvements. One commonly used technology is the ocean turbine, and this study involves experimental research on the NACA 0021 Airfoil model. It introduces the Vortex generator as a modification of geometry to enhance the lift force while minimizing drag force. The experiments took place in the Aerodynamics Lab at the Surabaya Aviation Polytechnic, utilizing a Wind Tunnel with a Test-Section measuring 600x600x1200 mm. The NACA 0021 foil model was 3D printed using filament material with an Aspect Ratio of 2:1. Measurements were taken using custom-made instrumentation such as Loadcell, focusing on observing changes in lift and drag coefficients from an angle of attack ranging from 0 to 80 degrees at a Reynolds Number of 2x105. The Vortex generator, made of 3D printed resin, with basic variables h=0.41δ; β=200; L=3.2h; D=7h, and d=0.5D, was tested to evaluate foil performance, with a variation in x/c = 5%. The optimum design resulted in a 30.93% increase in lift force (Cl/Cd) compared to the clean foil at an angle of attack of 15 degrees. However, no improvement was observed in its application to a vertical turbine, necessitating further analysis.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Airfoil, NACA 0021, Koefisien angkat dan hambat, Vertical Turbine, Vortex Generator.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1001 Production of electric energy or power
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Mohammad Farid
Date Deposited:	06 Feb 2024 01:22
Last Modified:	06 Feb 2024 01:22
URI:	http://repository.its.ac.id/id/eprint/106135

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