Hafizah, Nivana (2023) Studi Eksperimental Karakteristik Aliran Melintasi Silinder Sirkular Tunggal Dengan Penambahan Airfoil Di Belakang Silinder Sirkular Utama. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Ilmu mekanika fluida merupakan salah satu ilmu pengetahuan yang fenomenanya kerap berkaitan dengan kehidupan manusia. Salah satunya fenomena aliran fluida melintasi suatu bluff body. Dalam aplikasi engineering fenomena ini memegang peranan penting seperti pada konstruksi pipa bawah laut, jembatan, dan tube pada heat exchanger. Bluff body yang dilintasi oleh alilran fluida akan membentuk boundary layer dimana boundary layer merupakan lapisan yang terbentuk di sekitar permukaan padat yang dilintasi oleh aliran fluida. Bluff body dapat menghasilkan wake yang besar, salah satunya adalah silinder. Silinder memilki profil geometri yang bersifat strong adverse pressure yang menghasilkan wake yang besar sehingga berdampak pada dihasilkannya gaya hambat (drag) yang besar pada silinder. Oleh karena itu perlu untuk dilakukan pengurangan gaya hambat pada silinder dengan penambahan bodi pengganggu atau biasa disebut dengan metode passive flow control. Penelitian ini membahas terkait karakteristik aliran yang melintasi silinder sirkular tunggal dengan penambahan airfoil di belakang silinder sirkular utama. Eksperimental ini dilakukan pada sub-sonic wind tunnel berdimensi (H = 200 mm; W = 200 mm; L = 2000 mm), silinder sirkular utama berdiameter (D = 36 mm) dengan penambahan airfoil dengan chord length (c = 36 mm). Variasi simetris airfoil (NACA0012, NACA0018, NACA0024) dengan variasi jarak longitudinal (S/D = 1.6; 2.0; 2.4; 2.8) pada bilangan Reynolds 2.01 x 104. Tekanan diukur dengan menggunakan pressure tap yang dipasang pada kontur silinder sirkular utama dan profil kecepatan diukur dengan menggunakan pitot static tube yang dipasang di downstream body atau di belakang airfoil pada jarak 6D dari silinder sirkular utama. Pada penelitian ekseprimental ini dihasilkan karakteristik aliran yang melintasi silinder sirkular utama. Karakteristik aliran dapat diamati berdasarkan distribusi koefisien pressure, koefisien drag pressure, koefisien drag total, koefisien lift pada silinder sirkular utama serta profil kecepatan pada downstream body. Airfoil yang disusun secara tandem di belakang silinder sirkular utama diharapkan dapat mereduksi gaya drag pada silinder sirkular utama. Hasil yang diperoleh menunjukkan bahwa dengan penambahan airfoil di belakang silinder sirkular tunggal mampu mereduksi gaya drag yang bekerja pada silinder sirkular utama. Reduksi gaya drag ini diindikasikan oleh penurunan koefisien drag pressure
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Fluid mechanics is one of the sciences whose phenomena are often related to human life. One of them is the phenomenon of fluid flow across a bluff body. In engineering applications this phenomenon plays an important role such as in the construction of submarine pipes, bridges, and tubes in heat exchangers. Bluff body crossed by fluid flow will form a boundary layer where the boundary layer is a layer formed around a solid surface crossed by fluid flow. Bluff bodies can produce a large wake, one of which is a cylinder. The cylinder has a geometry profile that is strong adverse pressure which produces a large wake and has an impact on the generation of a large drag force on the cylinder. Therefore, it is necessary to reduce the drag on the cylinder by adding a disturbance body or commonly referred to as the passive flow control method. This research discusses the flow characteristics across a single circular cylinder with the addition of an airfoil behind the main circular cylinder. This research was conducted in a sub-sonic wind tunnel with dimensions (H = 200 mm; W = 200 mm; L = 2000 mm), main circular cylinder diameter (D = 36 mm) with the addition of airfoil with chord length (c = 36 mm). Variation of symmetrical airfoil (NACA0012, NACA0018, NACA0024) with variation of gap longitudinal (S/D = 1.6; 2.0; 2.4; 2.8) at Reynolds number 2.01 x 104. The pressure is measured using pressure taps mounted on the surface of the main circular cylinder and the velocity profile is measured using a pitot static tube mounted on the downstream body or behind the airfoil at a distance of 6D from the main circular cylinder. In this experimental research, the flow characteristics across the main circular cylinder are produced. The flow characteristics can be observed based on the distribution of pressure coefficient, pressure drag coefficient, total drag coefficient, lift coefficient on the main circular cylinder and velocity profile on the downstream body. Airfoils arranged in tandem behind the main circular cylinder are expected to reduce the drag force on the main circular cylinder. The results obtained indicate that adding an airfoil behind a single circular cylinder can reduce the drag force acting on the main circular cylinder. This reduction in drag force is indicated by a decrease in the coefficient of drag pressure (
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Bluff Body, Airfoil, Drag Force, Pressure Drag, Sub-sonic Wind Tunnel |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ820 Wind power |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Nivana Hafizah |
| Date Deposited: | 01 Sep 2023 03:16 |
| Last Modified: | 01 Sep 2023 03:16 |
| URI: | http://repository.its.ac.id/id/eprint/102135 |
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