Studi Numerik Pengaruh Pemasangan Riblet Protubed Terhadap Perubahan Karakteristik Aliran pada Airfoil NACA 0026. Studi Kasus Riblet Segitiga Ukuran S=H= 0.5 mm Arah Transversal

Muzaffar, Muhammad Zaki (2025) Studi Numerik Pengaruh Pemasangan Riblet Protubed Terhadap Perubahan Karakteristik Aliran pada Airfoil NACA 0026. Studi Kasus Riblet Segitiga Ukuran S=H= 0.5 mm Arah Transversal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan akan energi terbarukan yang efisien dan ramah lingkungan terus meningkat di Indonesia. Salah satu upaya mendukung transisi energi ini adalah pengembangan turbin angin dengan desain aerodinamika optimal. Penelitian ini bertujuan untuk menganalisis pengaruh riblet terhadap performa aerodinamis airfoil guna meningkatkan efisiensi energi. Penerapan riblet diharapkan dapat mengurangi gaya hambat (drag) dan meningkatkan gaya angkat (lift), sehingga mendukung kinerja aerodinamika airfoil pada turbin angin. Penelitian dilakukan dengan simulasi berbasis Computational Fluid Dynamics (CFD) menggunakan perangkat lunak ANSYS Fluent. Geometri dan meshing dibuat menggunakan Gambit. Variasi parameter meliputi sudut serang yaitu, -15°, -10°, -5°, 0°, 5°, 10°, 15°dan kecepatan angin sebesar 8, 12, 16 m/s. Riblet dengan profil segitiga memiliki tinggi 0,5 mm dan alas 0,5 mm, dipasang pada 25–30% panjang chord airfoil NACA 0026 yang memiliki panjang chord 200 mm. Simulasi dilakukan dalam bentuk dua dimensi (2D steady flow). Hasil penelitian menunjukkan bahwa kenaikan sudut serang secara signifikan memengaruhi distribusi koefisien tekanan (Cp) sepanjang chord airfoil. Pemasangan riblet meningkatkan koefisien drag terutama pada sudut serang 10° dan 15°, tetapi tidak berpengaruh signifikan pada sudut negatif. Selain itu, riblet dapat mempercepat transisi aliran, tetapi dalam beberapa kasus justru memperburuk kestabilan aliran. Efisiensi aerodinamika airfoil riblet meningkat pada sudut serang negatif, seperti terlihat dari rasio Cl/Cd yang lebih tinggi dibandingkan airfoil polos pada AOA –5° di berbagai kecepatan. Namun demikian, pada sudut serang tinggi, performa riblet menurun akibat ketidakmampuannya dalam mencegah separasi total, sehingga efektivitasnya terbatas pada rentang sudut serang tertentu.
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The demand for efficient and environmentally friendly renewable energy is continuously increasing in Indonesia. One of the efforts to support this energy transition is the development of wind turbines with optimal aerodynamic design. This research aims to analyze the effect of riblets on the aerodynamic performance of airfoils to improve energy efficiency. The application of riblets is expected to reduce drag and increase lift, thus supporting the aerodynamic performance of airfoils in wind turbines. The research was conducted using Computational Fluid Dynamics (CFD) simulations using ANSYS Fluent software. Geometry and meshing were created using Gambit. Variation parameters include angle of attack, namely -15°, -10°, -5°, 0°, 5°, 10°, 15° and wind speed of 8, 12, 16 m/s. The triangular profile riblet has a height of 0.5 mm and a base of 0.5 mm, installed with protubed alignment on 25-30% of the chord length of the NACA 0026 airfoil which has a chord length of 200 mm. The simulation was conducted in two-dimensional flow. The results of the study indicate that an increase in angle of attack significantly affects the distribution of the pressure coefficient (Cp) along the airfoil chord. The installation of riblets increases the drag coefficient, particularly at angles of attack of 10° and 15°, but has no significant effect at negative angles. In addition, riblets can accelerate the transition of flow under certain conditions, but in some cases may actually worsen flow stability. The aerodynamic efficiency of ribleted airfoils improves at negative angles of attack, as indicated by a higher Cl/Cd ratio compared to smooth airfoils at AOA –5° across various flow velocities. However, at high angles of attack, the performance of riblets declines due to their inability to prevent total flow separation, limiting their effectiveness to specific angle-of-attack ranges.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Airfoil, Gaya Lift, Gaya Drag, Riblet
Subjects:	T Technology > TJ Mechanical engineering and machinery 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 Zaki Muzaffar
Date Deposited:	04 Aug 2025 06:20
Last Modified:	04 Aug 2025 06:20
URI:	http://repository.its.ac.id/id/eprint/125121

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