Studi Eksperimental Aliran Melintasi Silinder Sirkular Tunggal Dengan Penempatan Splitter Plate Pada Bagian Upstream

Adiningrat, Bagus Wicaksono (2026) Studi Eksperimental Aliran Melintasi Silinder Sirkular Tunggal Dengan Penempatan Splitter Plate Pada Bagian Upstream. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Aliran udara yang melintasi silinder sirkular merupakan fenomena fundamental dalam mekanika fluida dan aerodinamika yang banyak dijumpai pada berbagai aplikasi teknik, seperti struktur jembatan, cerobong, pipa penukar kalor, dan elemen konstruksi lainnya. Salah satu permasalahan utama pada aliran ini adalah besarnya gaya hambat tekanan yang timbul akibat perbedaan tekanan antara sisi hulu dan hilir silinder. Upaya pengendalian gaya hambat tersebut dapat dilakukan melalui metode kontrol aliran pasif, salah satunya dengan pemasangan splitter plate di bagian hulu silinder. Penelitian ini bertujuan untuk mengkaji secara eksperimental pengaruh pemasangan splitter plate di depan silinder sirkular terhadap distribusi tekanan permukaan, koefisien gaya hambat tekanan, serta karakteristik aliran di daerah hilir. Eksperimen dilakukan menggunakan terowongan angin tipe open circuit dengan aliran udara subsonik yang diasumsikan bersifat incompressible. Silinder sirkular berdiameter 36 mm digunakan sebagai benda uji utama dengan splitter plate yang dipasang di bagian upstream. Variasi parameter meliputi panjang splitter plate L/D = 1 dan 1,5, jarak celah g/D = 0,14 dan 0,28, serta kecepatan aliran udara sebesar 5 m/s dan 10 m/s yang merepresentasikan bilangan Reynolds 1,1 × 10⁴ dan 2,3 × 10⁴. Distribusi tekanan permukaan diukur menggunakan pressure tap untuk memperoleh koefisien tekanan (Cp), sedangkan koefisien gaya hambat tekanan (CDP) dihitung menggunakan metode integrasi numerik Simpson 1/3. Profil kecepatan aliran di daerah downstream diukur menggunakan pitot-static tube. Hasil penelitian menunjukkan bahwa pemasangan splitter plate mampu meningkatkan tekanan belakang silinder dan menurunkan nilai CDP pada konfigurasi tertentu. Efektivitas reduksi gaya hambat dipengaruhi secara signifikan oleh kombinasi panjang splitter plate, jarak celah, dan bilangan Reynolds.
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Airflow over a circular cylinder is a fundamental phenomenon in fluid mechanics and aerodynamics, frequently encountered in engineering applications such as bridge structures, chimneys, heat exchanger tubes, and other structural elements. One of the primary concerns in such a flow is the magnitude of the pressure drag force arising from the pressure differential between the cylinder's upstream and downstream surfaces. This drag force can be mitigated through passive flow control methods, one of which involves installing a splitter plate on the upstream side of the cylinder. This experimental study aims to investigate the effect of installing a splitter plate in front of a circular cylinder on the surface pressure distribution, pressure drag coefficient, and downstream flow characteristics. The experiment was conducted in an open-circuit subsonic wind tunnel, with air flow assumed incompressible. A circular cylinder with a diameter of 36 mm served as the primary test object with a splitter plate mounted on the upstream section. Parameter variations included splitter plate length L/D = 1 and 1.5, gap spacing g/D = 0.14 and 0.28, and air flow velocities of 5 m/s and 10 m/s, representing Reynolds numbers of 1.1 × 10⁴ and 2.3 × 10⁴, respectively. Surface pressure distribution was measured using pressure taps to obtain pressure coefficients (Cp), while pressure drag coefficients (CDP) were calculated using Simpson's 1/3 rule numerical integration method. The flow velocity profile in the downstream region was measured using a pitot-static tube. The research results demonstrate that installing a splitter plate can increase back pressure in the cylinder and reduce CDP values under certain configurations. The effectiveness of drag reduction is significantly influenced by the combination of the splitter plate.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Silinder Sirkular, Splitter Plate, Koefisien Tekanan, Gaya Hambat Tekanan, Profil Kecepatan, Kontrol Aliran Pasif
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Bagus Wicaksono Adiningrat
Date Deposited:	03 Feb 2026 09:24
Last Modified:	03 Feb 2026 09:29
URI:	http://repository.its.ac.id/id/eprint/131832

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