Ivatrisfisetya, Evin Tbevinenty (2026) Studi Eksperimental Pengaruh Sudut Stagger Silinder Teriris Tipe-1 Sebagai Pengontrol Pasif Terhadap Gaya Drag & Lift Silinder Utama Sirkuler. Other thesis, lnstitut Teknologi Sepuluh Nopember.
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Abstract
Dalam penggunaannya, aliran yang melintasi sebuah silinder sirtuler akan menghasilkan gaya drag yang besar akibat dari separasi aliran yang terjadi lebih awal. Banyak metode yang telah dipepelajari untuk mereduksi gaya drag tersebut, salah satunya dengan menggunakan silinder sirlader kecil sebagai pengontrol pasif (Bouak, F. et al., 1998) atau dengan memberikan irisan pada silinder sirkuler (Aiba & Watanabe, 1997). Eksperimen kali ini dilakukan dengan menggunakan dua silinder yaitu silinder sirkuler utama berdiameter 60 mm dan silinder teriris tipe-1 berdiameter 7,5 mm dengan sudut iris (fJs) 0° dan 65° yang tersusun di depannya pada Subsonic Wind Tunnel. Pengujian dilakukan dengan memvariasikan sudut stagger (a) 12 °, 14 °, 16 °, 18 °, 20 °, 22 ° susunan silinder pengganggu tipe I terhadap silinder sirkuler utama pada bilangan Reynolds 53000, dimana penampang irisan silinder pengganggu tegak lurus terhadap free stream. Perbandingan jarak antar pusat silinder utama dan silinder pengganggu dengon diameter silinder utama (S/d) 1,375. Pada posisi sudut stagger tersebut diukur tekanan sepanjang kontur, goya drag, gaya lift, Iebar wake didapat dari mengukur distribusi tekanan di belakang susunan silinder, dan visutdisasi aliran dilakukan dengan metode oil flow piciute. Hasil eksperimen ini adalah silinder pengganggu dengan 0=65° pada a= 12° paling efektif untuk menurunkan gaya drag sampai dengan 41% dibandingkan dengan gaya drag silinder utama tunggal. Gaya lift paling malrsinrum juga dihasilkan oleh silinder pengganggu tipe-1 0s=65° pada sudut stagger (a)12°dengan harga -0,94.
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A circular cylinder used in practice has large dynamic drag resulting from separation of the flow over cylinder. In order to reduce the drag Coefficiefit of circular cylinder, some of methods were studied, such as using a small circular cylinder as passive control (Bouak, F. al, 1998), or studying a bluff body cut from a circular cylinder by Aiba and Watanabe (1997). This study is to present two bluff bodies, a circular cylinder and an I-type cylinder as a passive control to reduce the aerodynamics force on a circular cylinder. These are placed in tandem arrangement with varrying stagger angle. In order to reduce the drag force on a circular cylinder (d = 60 mm), a circular cylinder and an I-type cylinder having diameter of ds = 7,5 mm were used as a passive control. The pasive control with different cutting angles of Os = 65° and 0° (circular) were localed in various stagger angles of a = 12°, 14°, 16°, 18°, 20°. and 22° placed at spacing positions of S/d = 1,375. The experiments were caried out in a subsonic open circuit wind tunnel. This facility has a 150() mm long, with test section 660 mm x 660 mm. the free stream velocity of wind tunnel could be adjusted constant to 14 m/s, corresponding to Reynolds number Re = 5,3 x 104 (based on diameter d and Jhe free stream velocity). By measuring of pressure distribution around circular cylinder, drag force and velocity profiles behind the con.ftguratfon, mui also visualizing the flows by oil flow picture, the flowcharacteristics around the arrangement could be investigated The results show that cylinder I-type with cuJting angle (0s) 65° and stagger angle (a) 12°' was the most efectetive disturbance for reducing drag fofce until 41% if compared with dragf orce of main cylinder. Maximum lift force reached out until -0,94 outcomed by disturbance I-type cylinder with cutting angle (0s) 65° at positioning stagger angle (a) 12°.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Silinder teriris tipe -I, silinder sirkuler, drag, lift, pengontrol pasif, sudut stagger, I-type cylinder, circular cylinder, drag, lift, passive control, stagger angle |
| Subjects: | T Technology > TP Chemical technology > TP255 Electrochemistry, Industrial. |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | magang . |
| Date Deposited: | 16 Sep 2026 02:27 |
| Last Modified: | 16 Sep 2026 02:27 |
| URI: | http://repository.its.ac.id/id/eprint/144516 |
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