Oktavianingtyas, Nesvi (2026) Studi Numerik Pengaruh Modifikasi Pompa Sentrifugal Closed Impeller Menjadi Splitter Closed Impeller Dengan Variasi Outlet Angle Splitter (B2s) Menggunakan Cfd. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pompa sentrifugal merupakan mesin fluida yang banyak digunakan pada berbagai sektor industri karena mampu mengonversi energi mekanik menjadi energi hidrolik secara efisien. Namun, pada pompa sentrifugal moderate specific speed, masih sering terjadi fenomena aliran internal seperti flow separation, vortex, slip, dan kerugian hidrolik yang menyebabkan penurunan head dan efisiensi pompa. Salah satu upaya untuk meningkatkan performa pompa adalah dengan memodifikasi closed impeller melalui penambahan splitter blade yang berfungsi memperbaiki distribusi aliran serta mengurangi kerugian aliran di dalam saluran impeller. Penelitian ini bertujuan menganalisis pengaruh modifikasi closed impeller menjadi splitter closed impeller dengan variasi outlet angle splitter blade (β₂s) sebesar 11°, 14°, 17°, 20°, 23°, dan 26° menggunakan metode Computational Fluid Dynamics (CFD). Analisis dilakukan menggunakan ANSYS Fluent dengan model turbulensi Realizable k-ε pada kondisi steady-state dan fluida incompressible, kemudian divalidasi menggunakan data eksperimen. Evaluasi dilakukan terhadap performa pompa yang meliputi head dan efisiensi, serta dibandingkan dengan closed impeller original. Hasil penelitian menunjukkan bahwa penambahan splitter blade mampu meningkatkan performa pompa dibandingkan closed impeller original pada sebagian besar kondisi operasi. Variasi β₂s = 23° menghasilkan head tertinggi sebesar 14,91 m, sedangkan variasi β₂s = 11° menghasilkan efisiensi tertinggi sebesar 48,35%. Berdasarkan keseimbangan peningkatan head, efisiensi, dan karakteristik aliran internal, variasi β₂s = 17° merupakan performa pompa paling optimal dengan menghasilkan head sebesar 14,06 m dan efisiensi sebesar 47,39%, lebih tinggi dibandingkan closed impeller original yang menghasilkan head sebesar 11,61 m dan efisiensi sebesar 39,47%, dengan peningkatan head sebesar 21,10% dan efisiensi sebesar 20,07%.
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Centrifugal pumps are fluid-handling machines widely used in various industrial sectors because they can efficiently convert mechanical energy into hydraulic energy. However, in centrifugal pumps with moderate specific speeds, internal flow phenomena such as flow separation, vortices, slip, and hydraulic losses still frequently occur, leading to a decrease in head and pump efficiency. One way to improve pump performance is to modify a closed impeller by adding a splitter blade, which serves to improve flow distribution and reduce flow losses within the impeller channel. This study aims to analyze the effect of modifying a closed impeller into a splitter closed impeller with varying splitter blade outlet angles (β₂s) of 11°, 14°, 17°, 20°, 23°, and 26° using the Computational Fluid Dynamics (CFD) method. The analysis was performed using ANSYS Fluent with the Realizable k-ε turbulence model under steady-state conditions and for an incompressible fluid, and was then validated using experimental data. The pump’s performance—including head and efficiency—was evaluated and compared with that of the original closed impeller. The results of the study show that the addition of a splitter blade improves pump performance compared to the original closed impeller under most operating conditions. The β₂s = 23° configuration produced the highest head of 14.91 m, while the β₂s = 11° configuration achieved the highest efficiency of 48.35%. Based on the balance between head improvement, efficiency, and internal flow characteristics, the β₂s = 17° configuration was identified as the optimum impeller design, producing a head of 14.06 m and an efficiency of 47.39%. Compared with the original closed impeller, which produced a head of 11.61 m and an efficiency of 39.47%, the β₂s = 17° configuration increased the head and efficiency by 21.10% and 20.07%, respectively.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Closed Impeller, Computational Fluid Dynamics (CFD), Outlet Angle Impeller (β₂s), Splitter Blades Impeller, Closed Impeller, Computational Fluid Dynamics (CFD), Outlet Angle Impeller (β₂s), Splitter Blades Impeller |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General) T Technology > TJ Mechanical engineering and machinery > TJ910 Electric pumping machinery T Technology > TJ Mechanical engineering and machinery > TJ919 Centrifugal pumps--Design and construction. |
| Divisions: | Faculty of Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | Nesvi Oktavianingtyas |
| Date Deposited: | 01 Aug 2026 03:23 |
| Last Modified: | 01 Aug 2026 03:29 |
| URI: | http://repository.its.ac.id/id/eprint/141095 |
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