Studi Numerik Pengaruh Pemasangan Riblet Segitiga Ukuran S=H= 0,5 Mm Arah Tranversal Indented Terhadap Perubahan Karakteristik Aliran Pada Airfoil NACA 0026

Mustafa, Hafif Saharuddin (2025) Studi Numerik Pengaruh Pemasangan Riblet Segitiga Ukuran S=H= 0,5 Mm Arah Tranversal Indented Terhadap Perubahan Karakteristik Aliran Pada Airfoil NACA 0026. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan energi listrik di Indonesia terus meningkat, sementara cadangan bahan bakar fosil semakin menipis, sehingga diperlukan pemanfaatan energi terbarukan seperti energi angin. Pembangkit Listrik Tenaga Bayu (PLTB) menjadi solusi potensial melalui turbin angin, di mana desain airfoil yang optimal dapat meningkatkan efisiensi. Penelitian ini bertujuan menganalisis pengaruh penggunaan riblet pada airfoil terhadap gaya angkat (lift) dan gaya hambat (drag), dengan membandingkan airfoil polos dan airfoil dengan riblet. Metode yang digunakan adalah simulasi numerik Computational Fluid Dynamics (CFD) menggunakan software Gambit untuk desain geometri dan meshing, serta ANSYS Fluent untuk simulasi aliran dua dimensi. Penelitian ini menggunakan variasi kecepatan angin 8, 12, dan 16 (m/s) serta sudut serang/angle of attack (θ) -15°, -10°, -5°, 0°, 5°, 10°, dan 15°. Riblet yang digunakan berbentuk segitiga dengan dimensi tinggi 0,5 mm dan alas 0,5 mm. Riblet dipasang pada 25-30% panjang chord airfoil NACA 0026 yang memiliki panjang 200 mm dengan arah tranversal posisi indented.
Pada penelitian ini didapatkan hasil dengan penambahan riblet segitiga pada permukaan airfoil NACA 0026 menyebabkan perubahan distribusi tekanan bagian atas untuk sudut serang positif, namun untuk sudut serang negatif perubahan hanya pada area riblet. Penambahan riblet mengakibatkan sedikit kenaikan nilai koefisien lift pada variasi dan sudut serang tertentu. Riblet juga mengakibatkan adanya kenaikan nilai koefisien drag yang cukup signifikan terutama pada sudut serang positif. Pada sudut serang negatif penambahan riblet pengaruhnya tidak signifikan terhadap koefisien drag. Airfoil polos memiliki performa yang lebih baik dibandingkan airfoil riblet dengan melihat nilai lift-to-drag ratio. Hal ini disebabkan karena nilai koefisien drag yang dimiliki airfoil riblet yang lebih besar sehingga membuat nilai menjadi lift-to-drag ratio lebih kecil.
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The use of electrical energy in Indonesia continues to increase, while fossil fuel reserves are depleting, so it is necessary to utilize renewable energy such as wind energy. Wind power plants (PLTB) are a potential solution through wind turbines, where optimal airfoil design can increase efficiency. This study aims to analyze the effect of using riblets on airfoils on lift and drag, by comparing plain airfoils and airfoils with riblets. The method used is Computational Fluid Dynamics (CFD) numerical simulation using Gambit software for geometry and meshing design, and ANSYS Fluent for two-dimensional flow simulation. This study uses wind speed variations of 8, 12, and 16 (m/s) and angle of attack (θ) of -15°, -10°, -5°, 0°, 5°, 10°, and 15°. The riblets used are triangular in shape with dimensions of 0,5 mm height and 0,5 mm base. Riblets are installed at 25-30% of the chord length of the NACA 0026 airfoil which has a length of 200 mm in the tranversal direction of the indented position.
In this study, the results obtained with the addition of triangular riblets on the surface of the NACA 0026 airfoil caused changes in the upper pressure distribution for positive angles of attack, but for negative angles of attack the changes were only in the riblet area. The addition of riblets resulted in a slight increase in the lift coefficient value at certain variations and angles of attack. Riblets also caused a significant increase in the drag coefficient value, particularly at positive angles of attack. At negative angles of attack, the addition of riblets had no significant effect on the drag coefficient. Plain airfoil has better performance than riblet airfoil by looking at the lift-to-drag ratio value. This is due to the larger drag coefficient value of the riblet airfoil which makes the value of the lift-to-drag ratio smaller.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Airfoil, Koefisien Angkat, Koefisien Hambat, NACA 0026, Riblet , Airfoil, Lift Coefficient, Drag Coefficient, NACA 0026, Riblet
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL521 Aerodynamics, Hypersonic.
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Hafif Saharuddin Mustafa
Date Deposited:	01 Aug 2025 06:26
Last Modified:	01 Aug 2025 06:26
URI:	http://repository.its.ac.id/id/eprint/124392

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