Wardhana, Alfandy Anugrah (2021) Studi Numerik Pengaruh Pemasangan Vortex Generator dengan Tiga Nilai Ketinggian terhadap Coefficient of Drag Mobil Sapuangin XI. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of Revisi - Alfandy Anugrah W (4).pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
Revisi - Alfandy Anugrah W (4).pdf - Accepted Version Restricted to Repository staff only until 1 October 2023. Download (7MB) | Request a copy |
|
Text
02111740000071-Undergraduate_Thesis.pdf Restricted to Repository staff only Download (7MB) | Request a copy |
Abstract
Shell Eco Marathon adalah sebuah kompetisi yang disponsori oleh Shell di mana peserta ditantang untuk membuat kendaraan khusus dengan penggunaan bahan bakar atau sumber energi yang paling efisien. Kompetisi Shell Eco Marathon dibagi menjadi dua kelas, yaitu Prototype Class dan Urban Concept Class. ITS Team Sapuangin telah mengikuti kompetisi Shell Eco Marthon Asia sejak tahun 2011. Sejak tahun 2017, ITS Team Sapuangin berkompetisi pada kelas Urban Concept kategori Internal Combustion Engine Gasoline. Pada Shell Eco Marathon Asia 2019 yang diadakan di Sirkuit Sepang Malaysia, ITS Team Sapuangin berhasil mendapatkan juara 1 pada kelas dan kategori tersebut dengan capaian 415 km/liter.
Untuk meningkatkan efisien pengggunaan bahan bakar pada mobil Sapuangin XI pada kompetisi berikutnya, dilakukan dengan cara mengurangi resistive force akibat aerodynamic force. Pada penelitian ini, gaya hambat aerodinamika mobil Sapuangin XI akan dikurangi dengan menambah vortex generator pada body mobil. Penambahan vortex generator dipilih karena murah dari segi biaya dan mudah dari segi manufaktur untuk diaplikasikan. Penelitian ini mempelajari bagaimana pengaruh penambahan vortex generator dengan tiga nilai ketinggian terhadap coefficient of drag mobil Sapuangin XI. Tiga nilai ketinggian vortex generator yang digunakan adalah 20, 30, dan 40 mm. Kecepatan yang digunakan adalah 10, 25, dan 40 km/jam. Simulasi dilakukan menggunakan software ANSYS Fluent 2019.
Hasil menunjukkan coefficient of drag body Sapuangin XI asli lebih rendah daripada coefficient of drag mobil Sapuangin XI dengan semua variasi ketinggian vortex generator pada semua variasi kecepatan. Pada kecepatan 10 km/jam, nilai coefficient of drag vortex generator H = 20 mm mengalami kenaikan 5,445%, H = 30 mm mengalami kenaikan 2,527%, dan H = 40 mm mengalami kenaikan 4,224%. Pada kecepatan 25 km/jam, nilai coefficient of drag vortex generator H = 20 mm mengalami kenaikan 8,761%, H = 30 mm mengalami kenaikan 6,655%, dan H = 40 mm mengalami kenaikan 6,415%. Pada kecepatan 40 km/jam, nilai coefficient of drag vortex generator H = 20 mm mengalami kenaikan 10,449%, H = 30 mm mengalami kenaikan 4,287%, dan H = 40 mm mengalami kenaikan 2,380%. Secara umum, coefficient of drag vortex generator H = 40 mm paling rendah di antara semua variasi dengan vortex generator. Peningkatan coefficient of drag disebabkan karena vortex generator dapat bekerja dengan efektif di beberapa bagian dan tidak dapat bekerja secara efektif di beberapa bagian yang lain. Vortex generator mampu mengahasilkan vortex dan meningkatkan momentum fluida di beberapa bagian sehingga titik separasi dapat ditunda dan wake dapat dikurangi. Namun, vortex generator juga menghasilkan wake yang lebih besar di beberapa bagian yang lain. Selain itu, vortex generator juga mengasilkan wake karena bentuknya sendiri.
==================================================================================================================
Shell Eco Marathon is a competition sponsored by Shell in which participants are challenged to build a special vehicle using the most efficient fuel or energy source. Shell Eco Marathon competition is divided into two classes, namely Prototype Class and Urban Concept Class. ITS Team Sapuangin has been participating in the Shell Eco Marthon Asia competition since 2011. Since 2017, ITS Team Sapuangin has been competing in the Urban Concept class for the Internal Combustion Engine Gasoline category. At the 2019 Shell Eco Marathon Asia which was held at the Malaysia Sepang Circuit, ITS Team Sapuangin won 1st place in the class and category with an achievement of 415 km/liter.
To improve the fuel efficiency of the Sapuangin XI car in the next competition, it will be done by reducing the resistive force due to aerodynamic forces. In this study, the aerodynamic drag of the Sapuangin XI car will be reduced by installing a vortex generator to the car body. The installation of a vortex generator is chosen because it is cheap in terms of cost and easy from a manufacturing point of view to implement. This study studies the effect of installing a vortex generator with three height variations on the drag coefficient of the Sapuangin XI car. Variations in the height of the vortex generator used are 20, 30, and 40 mm. The speeds used are 10, 25, and 40 km/hour. The simulation is done using the ANSYS Fluent 2019 software.
The results shows that the drag coefficient of the original Sapuangin XI car is lower than the drag coefficient of the Sapuangin XI car with all variations of the vortex generator at all variations of speed. At a speed of 10 km/hour, the drag coefficient of the vortex generator H = 20 mm increases by 5.445%, H = 30 mm increases by 2.527%, and H = 40 mm increases by 4.224%. At a speed of 25 km/hour, the drag coefficient of the vortex generator H = 20 mm increases 8.761%, H = 30 mm increases 6.655%, and H = 40 mm increases 6.415%. At a speed of 40 km/hour, the drag coefficient of the vortex generator H = 20 mm increases by 10.449%, H = 30 mm increases by 4.287%, and H = 40 mm increases by 2.380%. In general, the drag coefficient of the vortex generator H = 40 mm is the lowest among all variations. The increase in drag coefficient is due to the fact that the vortex generator can work effectively in some areas and cannot work effectively in other areas. Vortex generator can generate vortex and increase fluid momentum in some areas so that the separation point can be delayed and wake can be reduced. However, the vortex generator also produces a larger wake in some other areas. Vortex generator also produces wake because of its own shape.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | boundary layer, CFD, coefficient of drag, separasi aliran, vortex generator boundary layer, CFD, coefficient of drag, flow seperation, vortex generator |
| 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: | Alfandy Anugrah Wardhana |
| Date Deposited: | 14 Aug 2021 09:36 |
| Last Modified: | 14 Aug 2021 09:36 |
| URI: | http://repository.its.ac.id/id/eprint/86448 |
Actions (login required)
 |
View Item |