Studi Numerik Pengaruh Penambahan Fowler Flap terhadap Karakteristik Aliran Fluida pada Airfoil NACA 4412

Salsabilla, Nadia (2024) Studi Numerik Pengaruh Penambahan Fowler Flap terhadap Karakteristik Aliran Fluida pada Airfoil NACA 4412. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sayap merupakan bagian penting dari pesawat. Oleh karena itu, geometri dari sayap pesawat menjadi salah satu hal penting yang diperhatikan dalam manufaktur pesawat. Dalam perkembangannya, demi mengoptimalkan karakteristik aerodinamiknya, sayap pesawat ditambahkan dengan sebuah alat yang dapat membantu meningkatkan gaya angkat atau disebut sebagai High Lift Device (HLD). Dengan bertambahnya angle of attack pada saat proses take off maka koefisien angkat akan meningkat. Namun, begitu pula dengan koefisien hambat yang dihasilkan, hal ini terjadi karena kemunculan wake pada bagian belakang sayap. Penggunaan flap dapat mengoptimalkan rasio antara gaya angkat dan hambat pada airfoil. Aliran yang melewati celah antara main wing dan flap dapat menunda terlepasnya aliran pada upper surface. Studi numerik dilakukan secara dua dimensi dengan menggunakan software CFD Ansys Fluent Student Version. HLD yang digunakan berupa fowler flap airfoil NACA 4412 dengan jarak gap sebesar 0,025c, dengan c didefinisikan sebagai chord airfoil. Panjang chord adalah 1 m. Reynold number yang digunakan sebesar 3 ×10^6 atau sama dengan kecepatan udara bebas sebesar 43,8 m/s. Angle of attack yang digunakan sebesar 0° hingga 18°. Flap didefleksikan sebesar 20°,30°,dan 40°. Permodelan turbulensi yang digunakan adalah k-ω SST. Hasil yang diperoleh dari studi numerik ini adalah peningkatan nilai koefisen angkat (CL) pada fowler flap airfoil NACA 4412 dibandingkan dengan plain airfoil yang diiringi dengan meningkatnya koefisien hambat (CD). Selain itu, terdapat peningkatan nilai rasio koefisen angkat dan hambat (CL/CD) pada sudut serang 0° dan 8° dengan variasi fowler flap airfoil NACA 4412 berdefleksi sudut 20° dan 30°
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Wings are an essential part of an aircraft. Therefore, the geometry of the aircraft wing is a crucial aspect considered in aircraft manufacturing. Research and development of aircraft wing airfoil are extensively conducted to obtain optimal aerodynamic characteristics for each type of aircraft. In its development, to optimize its aerodynamic characteristics, aircraft wings are equipped with a device that can help increase lift force, known as a High Lift Device (HLD). As the angle of attack increases during take-off, the lift coefficient will increase. However, so will the drag coefficient generated due to the wake. The use of flaps can optimize the ratio between the lift and drag coefficients on the airfoil. Flow passing through the gap between the main wing and flap can delay flow separation on the upper surface. Numerical studies are conducted in two dimensions using the CFD software Ansys Fluent Student Version. The model used is a NACA 4412 airfoil with a Fowler flap and a gap distance of 0.025 c, where c is defined as the airfoil chord. The chord length is 1 m. The Reynolds number used is 3 ×10^6, or equivalently, the free air velocity is 43.8 m/s. The angle of attack used is 0° until 18°. The flap is deflected by 20°,30°,and 40°. The turbulence model used is k-ω SST. The results obtained from this numerical study indicate an increase in the lift coefficient CL of the NACA 4412 airfoil with the addition of the Fowler flap, accompanied by an increase in the drag coefficient CD. Additionally, there is an increase in the lift-to-drag ratio CL / CD at an angle of attack of 0° with the Fowler flap on the NACA 4412 airfoil deflected at 20° and 30°.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Fowler Flap, Lift Coefficient, Drag Coefficient, Ratio Lift to Drag Coefficient, Fowler Flap, Koefisien Angkat, Koefisien Hambat, Rasio Lift to Drag
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage. T Technology > TL Motor vehicles. Aeronautics. Astronautics T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL521 Aerodynamics, Hypersonic. T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL673.F6 Flaps (Airplane)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Nadia Salsabilla
Date Deposited:	11 Aug 2024 05:26
Last Modified:	11 Sep 2024 03:25
URI:	http://repository.its.ac.id/id/eprint/114669

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