Studi Eksperimental Pengaruh Silinder Sirkuler Sebagai Pengontrol Pasif Terhadap Kinerja Airfoil NACA 0026 "Studi Kasus Untuk Rasio Diameter D/t = 0,5 Dan Rasio Jarak Penempatan R/c = 0,56"

Wardhana, Muhammad Daffa Rizma (2026) Studi Eksperimental Pengaruh Silinder Sirkuler Sebagai Pengontrol Pasif Terhadap Kinerja Airfoil NACA 0026 "Studi Kasus Untuk Rasio Diameter D/t = 0,5 Dan Rasio Jarak Penempatan R/c = 0,56". Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ketergantungan pembangkit listrik pada energi fosil mendorong perlunya pengembangan sumber energi terbarukan, salah satunya energi angin. Dalam sistem turbin angin, airfoil berperan penting dalam menghasilkan gaya angkat dan menentukan kinerja aerodinamika. Namun pada sudut serang tinggi, airfoil rentan mengalami separasi aliran yang menyebabkan penurunan gaya angkat dan peningkatan gaya hambat, sehingga memicu terjadinya stall. Penelitian ini bertujuan untuk mengkaji pengaruh silinder sirkuler yang ditempatkan di depan leading edge sebagai pengontrol pasif guna meningkatkan kinerja aerodinamika airfoil NACA 0026. Penelitian ini dilakukan secara eksperimental menggunakan wind tunnel pada airfoil NACA 0026. Silinder yang digunakan memiliki diameter 19,5 mm dengan rasio d/t = 0,5 dan ditempatkan pada jarak R = 85 mm (R/C = 0,56) di depan leading edge. Variasi sudut penempatan silinder yang diuji adalah θ = –45°, –30°, –15°, 0°, 15°, 30°, dan 45°, dengan kecepatan aliran udara 6 m/s dan 12 m/s. Parameter yang dianalisis meliputi coefficient of pressure (Cp), coefficient of lift (CL), coefficient of drag (CD), dan rasio CL/CD. Hasil pengujian menunjukkan bahwa performa aerodinamika terbaik diperoleh pada konfigurasi sudut θ = ±30°, dengan nilai rasio CL/CD tertinggi sebesar 0,456 pada kecepatan 12 m/s. Sebaliknya, performa terendah terjadi pada konfigurasi sudut θ = 0° pada kedua variasi kecepatan aliran, yaitu 6 m/s dan 12 m/s, dengan nilai rasio CL/CD sebesar 0. Pada konfigurasi sudut θ = ±15° baik kecepatan 6 m/s maupun 12 m/s, arah gaya lift yang dihasilkan berlawanan dengan hipotesis awal penelitian, dengan efek blockage yang lebih dominan.
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The dependence of electricity generation on fossil energy sources has encouraged the development of renewable energy, one of which is wind energy. In wind turbine systems, the airfoil plays an important role in generating lift and determining aerodynamic performance. However, at high angles of attack, the airfoil is prone to flow separation, which causes a decrease in lift and an increase in drag, thereby triggering stall. This study aims to investigate the effect of a circular cylinder positioned in front of the leading edge as a passive controller to improve the aerodynamic performance of a NACA 0026 airfoil. This study was conducted experimentally using a wind tunnel on a NACA 0026 airfoil. The cylinder used has a diameter of 19.5 mm with a ratio of d/t = 0.5 and is positioned at a distance of R = 85 mm (R/C = 0,56) in front of the leading edge. The variations in cylinder placement angle tested were θ = –45°, –30°, –15°, 0°, 15°, 30°, and 45°, with airflow velocities of 6 m/s and 12 m/s. The parameters analyzed include the coefficient of pressure (Cp), coefficient of lift (CL), coefficient of drag (CD), and the CL/CD ratio. The test results show that the best aerodynamic performance was obtained at the cylinder placement angle of θ = ±30°, with the highest CL/CD ratio of 0.456 at a flow Velocity of 12 m/s. Conversely, the lowest performance occurred at θ = 0° for both flow Velocity variations, namely 6 m/s and 12 m/s, with a CL/CD ratio of 0. At θ = ±15°, the direction of the generated lift force was opposite to the initial hypothesis at both 6 m/s and 12 m/s. This condition was influenced by the more dominant blockage effect.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	airfoil, pengontrol pasif, silinder, separasi aliran, aerodinamika, airfoil, passive control, cylinder, flow separation, aerodynamics
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:	Muhammad Daffa Rizma Wardhana
Date Deposited:	28 Jul 2026 04:15
Last Modified:	28 Jul 2026 04:15
URI:	http://repository.its.ac.id/id/eprint/138510

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