Studi Eksperimental Aliran Melintasi Silinder Sirkular Tunggal dengan Penempatan Plat Splitter pada Bagian Downstream “Studi Kasus Pengaruh Panjang dan Ketebalan Plat Splitter”

Tharif, Dzaky Farhan (2026) Studi Eksperimental Aliran Melintasi Silinder Sirkular Tunggal dengan Penempatan Plat Splitter pada Bagian Downstream “Studi Kasus Pengaruh Panjang dan Ketebalan Plat Splitter”. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Fenomena aliran yang melintasi silinder sirkular menjadi topik penting dalam studi aerodinamika karena menghasilkan berbagai struktur aliran kompleks seperti pemisahan lapisan batas, pembentukan pusaran dan daerah wake bertekanan rendah yang meningkatkan gaya hambat (drag).Upaya untuk mengurangi drag telah banyak dikembangkan melalui metode kontrol aliran pasif,salah satunya dengan pemasangan splitter plate di belakang silinder. Penelitian ini bertujuan untuk menganalisis pengaruh panjang dan ketebalan plate splitter terhadap distribusi tekanan,gaya hambat,serta karakteristik aliran di wake region.Hasil penelitian ini diharapkan dapat memberikan pemahaman mendalam mengenai efektivitas variasi geometri spliter plat dalam mengurangi gaya drag serta menstabilkan aliran di belakang silinder. Metode penelitian dilakukan secara eksperimental dengan menggunakan wind tunnel di Laboratorium Mekanika dan Mesin-Mesin Fluida Departemen Teknik Mesin FTIRS–ITS. Benda uji terdiri dari silinder sirkular berdiameter 36 mm yang dipasangi plate splitter akrilik di bagian downstream dengan dua variasi ketebalan (t = 0,08D dan 0,014D) serta empat variasi panjang (L = 0,5D; D; 1,5D; 2D). Kecepatan udara freestream dijaga konstan sebesar 11 m/s,dengan jarak celah antara silinder dan plate splitter sebesar 5 mm (0,14D).Pengukuran dilakukan menggunakan pitot-static tube dan manometer Fluke 922 untuk memperoleh data tekanan dan kecepatan.Data hasil eksperimen diolah untuk mendapatkan distribusi koefisien tekanan (CP) dan koefisien drag (CDP) yang kemudian dianalisis untuk menilai pengaruh geometri splitter plate terhadap karakteristik aliran. Hipotesis penelitian ini menyatakan bahwa peningkatan panjang plate splitter lebih optimal dan akan memperkecil daerah wake serta menurunkan gaya hambat secara signifikan, sedangkan peningkatan ketebalan plate splitter akan menimbulkan efek sebaliknya karena memperbesar area gangguan aliran. Hasil yang diproleh menunjukkan penambahan plat splitter dibagian downsteam terbukti efektif dalam mereduksi gaya drag pada silinder sirkular. Reduksi gaya drag diindikasi berdasarkan nilai coeffisien drag pressure (CDp) paling optimal pada konfigurasi plat splitter dengan L/D = 1,5D dan t/D = 0,14D dengan reduksi gaya drag sebesar 26%.
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The flow phenomenon across a circular cylinder is an important topic in aerodynamic studies because it produces various complex flow structures such as boundary layer requirements, vortex shedding, and low-pressure wake regions that increase drag. Efforts to reduce drag have been widely developed through passive flow control methods, one of which is by installing a splitter plate behind the cylinder. This study aims to analyze the effect of the length and thickness of the splitter plate on the pressure distribution, drag force, and flow characteristics in the wake region. The results of this study are expected to provide a deeper understanding of the effectiveness of variations in the geometry of the splitter plate in reducing drag and stabilizing the flow behind the cylinder. The research method was conducted experimentally using an open-circuit wind tunnel at the Fluid Mechanics and Machinery Laboratory of the Department of Mechanical Engineering, FTIRS–ITS. The test specimen consisted of a 36 mm diameter circular cylinder fitted with an acrylic splitter plate in the downstream section with two thickness variations (t = 3 mm and 5 mm) and four length variations (L = 0.5D; D; 1.5D; 2D). The freestream air velocity was kept constant at 11 m/s, with a gap between the cylinder and the splitter plate of 5 mm (0.14D). Measurements were made using a pitot-static tube and an inclined manometer to obtain pressure and velocity data. The experimental data were processed to obtain the distribution of the pressure coefficient (Cp) and drag coefficient (CDP), which were then analyzed to assess the effect of the splitter plate geometry on the flow characteristics. The hypothesis of this research states that increasing the length of the splitter plate is more optimal and will reduce the wake area and reduce the drag force significantly, while increasing the thickness of the splitter plate will have the opposite effect because it increases the flow disturbance. The results obtained show that the addition of a splitter plate in the downsteam section is proven to be effective in reducing the drag force on the circular cylinder. The drag force reduction is indicated based on the most optimal drag pressure coefficient (CDp) value in the splitter plate configuration with L/D = 1.5D and t/D = 0.14D with a drag force reduction of 26%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	silinder sirkular, splitter plate, gaya hambat, aliran wake, eksperimen terowongan angin.
Subjects:	T Technology > T Technology (General) T Technology > T Technology (General) > T58.62 Decision support systems T Technology > TJ Mechanical engineering and machinery > TJ820 Wind power T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Dzaky Farhan At-tharif
Date Deposited:	02 Feb 2026 07:28
Last Modified:	02 Feb 2026 07:28
URI:	http://repository.its.ac.id/id/eprint/131619

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