Faira, Fadhil Abdillah (2022) Studi Eksperimen Pengaruh Penambahan Bodi Pengganggu Terhadap Gaya Hambat Dua Silinder Sirkular Tersusun Tandem “Studi kasus variasi sudut pengganggu 20°, 30°, 40°, dan 60° pada jarak antar silinder L/D : 1,5”. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Fenomena aliran fluida ketika melewati suatu benda berupa streamline body dan bluff body sering dijumpai penggunaanya dalam bidang industri. Bluff body yang dilingkupi fluida akan mengalami gaya akibat interaksi dengan fluida, salah satunya gaya drag, dimana umumnya gaya drag tidak diinginkan. Untuk mereduksi gaya hambat dapat dilakukan dengan cara penambahan bodi pengganggu di daerah upstream. Penelitian ini membahas mengenai pengaruh penambahan bodi pengganggu pada dua silinder sirkular tersusun tandem. Penelitian ini dilakukan pada susunan dua silinder sirkular secara tandem dengan penambahan inlet disturbance body yang ditempatkan di depan upsteream cylinder dengan variasi sudut θ = 20°, 30°, 40°, dan 60° serta menggunakan bilangan Reynolds 4,76 x 104– 1,33 x 105. Dua buah silinder sirkular utama dengan diameter (D) 25 mm dengan penambahan Inlet Disturbance Body (IDB) menggunakan diameter kedua bodi pengganggu berukuran sama yaitu,
d = 5 mm (d/D = 0,2). Jarak antara silinder utama dengan bodi pengganggu tetap yaitu 0,4 mm (g/D = 0,016). Sedangkan perbandingan jarak antar silinder utama L = 37,5 mm tetap yaitu, (L/D = 1,5). Pressure drop diukur menggunakan wall pressure taps dipasang pada dinding saluran. Tekanan diukur menggunakan pressure taps yang dipasang pada permukaan dua silinder sirkular. Profil kecepatan diukur menggunakan pitot static tube yang dipasang dibelakang silinder sirkular. Hasil yang akan diperoleh dari penelitian ini adalah pressure drop, distribusi koefisien tekanan (CP), dan koefisien drag pressure (CDP). Hasil yang diperoleh menunjukkan reduksi pressure drop efektif pada konfigurasi tandem dengan IDB 20° dan 30° dibanding konfigurasi tandem tanpa IDB pada bilangan Reynolds 9,7 x 104 – 1,33 x 105. Reduksi koefisien pressure drag maksimum untuk silinder upstream terjadi pada konfigurasi tandem dengan IDB 30° sebesar 51% dan konfigurasi tandem dengan IDB 20° dan 40° reduksi sebesar 22 - 24%. Sedangkan untuk silinder downstream nilai koefisien pressure drag meningkat untuk setiap konfigurasi tandem dengan IDB
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The phenomenon of fluid flow when passing through an object in the form of a streamlined body and a bluff body is often used in the industrial sector. The bluff body which is surrounded by fluid will experience a force due to interaction with the fluid, one of which is the drag force, where generally the drag force is not desired. To reduce drag, it can be done by adding a inlet disturbance body in the upstream area. This study discusses the effect of adding a nuisance body to two circular cylinders arranged in tandem.This research was conducted in a tandem arrangement of two circular cylinders with the addition of an inlet disturbance body placed in front of the upsteream cylinder with a variation of angle = 20o, 30o, 40o, and 60o and using Reynolds number 4,76 x 104– 1,33 x 105. Two main circular cylinders with a diameter (D) of 25 mm with the addition of an Inlet Disturbance Body (IDB) using the diameter of the two disturbing bodies of the same size, namely, d = 5 mm (d/D = 0,2). The distance between the main cylinder and the interfering body remains 0,4 mm (g/D =0,016). While the ratio of the distance between the main cylinders L = 37,5 mm remains, that is, (L/D = 1,5). Pressure drop is measured using wall pressure taps mounted on the channel wall. Pressure is measured using pressure taps mounted on the surface of two circular cylinders. The velocity profile was measured using a pitot static tube mounted behind a circular cylinder. The results to be obtained from this research are pressure drop, distribution of pressure coefficient (CP), and coefficient of drag pressure (CDP). The resulting results show a reduction in the effective pressure in the tandem configuration with IDB 20° and 30° compared to the tandem configuration without IDB at the Reynolds number 9,7 x 104– 133 x 105. The maximum drag coefficient reduction for the upstream cylinder occurs in the tandem configuration with IDB 30° is 51% and tandem configuration with IDB 20° and 40° is reduced by 22 - 24%. While for the downstream cylinder the pressure coefficient value increases for each configuration with IDB
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 620.106 4 Fai s-1 2022 |
| Uncontrolled Keywords: | Bluff body, Inlet Disturbance Body (IDB), silinder sirkular, tandem, |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 24 Feb 2025 09:10 |
| Last Modified: | 24 Feb 2025 09:10 |
| URI: | http://repository.its.ac.id/id/eprint/118867 |
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