Studi Numerik Performa Airfoil Eppler 420 Sebagai Rear Wing Mobil Sapu Angin Speed (SAS) 8 Dengan Modifikasi Cascade Airfoil

Sahputra, Stefanus Kevin (2025) Studi Numerik Performa Airfoil Eppler 420 Sebagai Rear Wing Mobil Sapu Angin Speed (SAS) 8 Dengan Modifikasi Cascade Airfoil. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan perangkat aerodinamika seperti rear wing pada kendaraan merupakan salah satu hasil perkembangan teknologi di bidang otomotif. Pada mobil Formula Student, rear wing berfungsi untuk meningkatkan performa kendaraan dengan menghasilkan gaya tekan ke bawah (down force) secara maksimal, disertai gaya hambat (drag) yang seminimal mungkin.
Melalui penelitian dilakukan evaluasi performa penggunaan airfoil Eppler 420, serta menganalisis pengaruh variasi gap dan overlap pada konfigurasi cascade terhadap kinerja rear wing kendaraan Sapu Angin Speed 8 (SAS 8) ditinjau dari nilai negative lift dan drag. Simulasi dilakukan secara numerik menggunakan metode Computational Fluid Dynamics (CFD) dengan pendekatan 2D aliran steady, incompressible, pada kecepatan aliran 13,89 m/s, serta peggunaan model turbulensi transition SST. Variasi percobaan meliputi sudut serang flap sebesar 20°, dan 28,75°, dan variasi gap antara main airfoil dan main cascade airfoil sebesar 130 mm, 150 mm, 177 mm.
Hasil simulasi menunjukkan bahwa peningkatan gap antar elemen rear wing secara konsisten meningkatkan down force, dengan nilai tertinggi sebesar 321,61 N pada gap 177 mm. Penambahan cascade airfoil secara signifikan meningkatkan efisiensi aerodinamika, terbukti dari peningkatan rasio FL/FD hingga 35% dibanding desain tanpa cascade. Variasi terbaik ditemukan pada konfigurasi gap 150 mm dan sudut serang 20°, dengan rasio FL/FD sebesar 5,34
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The use of aerodynamic devices such as the rear wing in vehicles is one of the outcomes of technological advancements in the automotive field. In Formula Student cars, the rear wing serves to enhance vehicle performance by generating maximum down force while minimizing drag.
This study evaluated the performance of the Eppler 420 airfoil and to analyze the effects of varying gap and overlap in a cascade configuration on the rear wing performance of the Sapu Angin Speed 8 (SAS 8) vehicle, with a focus on negative lift and drag values.Numerical simulation carried out using the Computational Fluid Dynamics (CFD) method with a 2D, steady, incompressible flow approach at a flow velocity of 13.89 m/s, utilizing the Transition SST turbulence model. The test variations include flap angles of 20°, and 28,75°, as well as gap distances between the main airfoil and the main cascade airfoil of 130 mm, 150 mm, and 177 mm.
The simulation results indicate that increasing the gap between rear wing elements consistently enhances down force, with the highest value of 321.61 N achieved at a 177 mm gap. The addition of a cascade airfoil significantly improves aerodynamic efficiency, increasing the FL/FD ratio by up to 35% compared to the non-cascade design. The optimal configuration was found at a 150 mm gap and 20° angle of attack, yielding an FL/FD ratio of 5.34

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Formula Student, rear wing, cascade airfoil, Eppler E420, CFD, down force, drag
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL521 Aerodynamics, Hypersonic. T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL574.C3 Cascade
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Stefanus Kevin Sahputra
Date Deposited:	01 Aug 2025 09:21
Last Modified:	01 Aug 2025 09:21
URI:	http://repository.its.ac.id/id/eprint/125796

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