Studi Eksperimen Pengaruh Pemasangan Triangle Riblet Terhadap Perubahan Karakteristik Aliran Pada Airfoil Naca 0026 “Studi Kasus Triangle Riblet Ukuran S = H = 1 mm Arah Longitudinal Posisi Aligned”

Ramadhan, Bima Anugrah (2025) Studi Eksperimen Pengaruh Pemasangan Triangle Riblet Terhadap Perubahan Karakteristik Aliran Pada Airfoil Naca 0026 “Studi Kasus Triangle Riblet Ukuran S = H = 1 mm Arah Longitudinal Posisi Aligned”. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Efisiensi aerodinamika merupakan aspek penting dalam desain airfoil yang digunakan pada berbagai aplikasi teknik. Airfoil NACA 0026, sebagai airfoil simetris dengan ketebalan 26% dari chord, memiliki kecenderungan mengalami separasi aliran pada sudut serang tinggi yang berdampak pada peningkatan gaya hambat (drag) dan penurunan gaya angkat (lift). Untuk mengatasi permasalahan tersebut, teknologi kontrol aliran pasif seperti riblet digunakan. Penelitian ini bertujuan untuk mengkaji pengaruh pemasangan riblet berbentuk Triangle-V dengan ukuran s = h = 1 mm secara longitudinal pada permukaan atas airfoil NACA 0026 terhadap perubahan karakteristik aliran. Pengujian dilakukan secara eksperimental menggunakan terowongan angin subsonik dengan variasi sudut serang –10°, –5°, 0°, 5°, dan 10°, serta kecepatan udara 8 m/s, 12 m/s, dan 16 m/s. Riblet dipasang secara longitudinal pada sisi upper surface airfoil. Hasil pengujian menunjukkan bahwa riblet belum mampu memberikan efek signifikan dalam meningkatkan performa aerodinamika airfoil. Riblet mampu meningkatkan nilai koefisien gaya angkat (CL) di kecepatan tinggi khususnya pada sudut serang 5o, tetapi disertai dengan kenaikan nilai koefisien gaya hambat (CD) yang signifikan. Sedangkan pada kecepatan 8 m/s dan 12 m/s riblet menghasilkan CL yang lebih rendah dari airfoil polos. Selain itu, wake region pada sisi atas menunjukkan profil yang luas menandakan drag lebih besar pada airfoil riblet akibat separasi aliran pada seluruh variasi pengujian. Hal ini menyebabkan rasio CL/CD atau performa aerodinamika airfoil riblet justru lebih rendah dibandingkan airfoil polos khususnya pada variasi kecepatan udara rendah yaitu 8 m/s.
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Aerodynamic efficiency is a critical aspect in the design of airfoils used in various engineering applications. The NACA 0026 airfoil, a symmetric airfoil with a thickness of 26% of the chord, tends to experience flow separation at high angles of attack, resulting in increased drag and decreased lift. To address this issue, passive flow control technologies such as riblets are applied. This study aims to investigate the effect of installing longitudinal triangle V-shaped riblets with a dimension of s = h = 1 mm on the upper surface of the NACA 0026 airfoil on the flow characteristics. The experiment was conducted experimentally using a subsonic wind tunnel with variations in angles of attack of –10°, –5°, 0°, 5°, and 10°, and airspeeds of 8 m/s, 12 m/s, and 16 m/s. Riblets were installed longitudinally on the upper surface of the airfoil. The test results showed that riblets were unable to provide a significant effect in improving the aerodynamic performance of the airfoil. Riblets were able to increase the Coefficient of Lift (CL) value at high speeds, especially at an angle of attack of 5o, but accompanied by a significant increase in the Coefficient of Drag (CD) value. Meanwhile, at speeds of 8 m/s and 12 m/s, riblets produced lower CL than plain airfoils. In addition, the wake region on the upper side showed a wide profile indicating greater drag on the riblet airfoil due to flow separation in all test variations. This caused the CL/CD ratio or aerodynamic performance of the riblet airfoil to be lower than that of the plain airfoil especially at low airspeed of 8 m/s.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Airfoil NACA 0026, Riblet, Pengurangan Drag, Separasi Aliran, Wind Tunnel Airfoil NACA 0026, Riblet, Drag Reduction, Flow Separation, Wind Tunnel
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL521 Aerodynamics, Hypersonic.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Bima Anugrah Ramadhan
Date Deposited:	31 Jul 2025 06:11
Last Modified:	31 Jul 2025 06:11
URI:	http://repository.its.ac.id/id/eprint/124317

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