Studi Numerik Pengaruh Modifikasi Closed Impeller Menjadi Tandem Blades Impeller dengan Variasi Gap terhadap Performa Pompa Sentrifugal

Nisa', Rachmania Khoyrun (2026) Studi Numerik Pengaruh Modifikasi Closed Impeller Menjadi Tandem Blades Impeller dengan Variasi Gap terhadap Performa Pompa Sentrifugal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pompa sentrifugal merupakan salah satu jenis pompa dinamis yang paling banyak digunakan di berbagai sektor industri karena konstruksinya yang sederhana, harga relatif murah, serta perawatan yang mudah. Kinerja pompa sentrifugal sangat dipengaruhi oleh desain impeller, salah satunya melalui modifikasi konfigurasi sudu menjadi tandem blades, yaitu penyusunan dua baris sudu (front blade dan rear blade) secara berurutan dalam satu jalur aliran dengan celah (gap) sebagai zona transisi aliran. Penelitian ini bertujuan untuk menganalisis pengaruh modifikasi closed impeller menjadi tandem blades impeller dengan variasi gap 8°, 10°, 13°, 16°, 19°, 22°, dan 25° terhadap performa pompa sentrifugal menggunakan fluida air. Metode yang digunakan adalah simulasi numerik Computational Fluid Dynamics (CFD) dengan perangkat lunak Ansys Fluent, menggunakan model turbulensi Realizable k-ε yang telah divalidasi terhadap data eksperimen dengan rata-rata error sebesar 1,22%. Parameter yang dianalisis meliputi head, efisiensi, Water Horse Power (WHP), Brake Horse Power (BHP), dan torsi. Hasil penelitian menunjukkan bahwa variasi gap 8°, 10°, 13°, dan 16° menghasilkan head yang lebih tinggi dibandingkan closed impeller original (14,25 m), dengan head tertinggi diperoleh pada gap 10° sebesar 15,38 m. Sementara itu, konfigurasi gap 16° memberikan efisiensi tertinggi sebesar 39,78% pada kapasitas 111,6 lpm, melampaui efisiensi closed impeller original sebesar 39,47%. Konfigurasi gap 16° dinilai sebagai variasi paling optimal karena mampu meningkatkan head sekaligus efisiensi pompa secara bersamaan, dengan Best Efficiency Point (BEP) diperkirakan berada pada kapasitas 141 lpm dengan efisiensi 42,04%.
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Centrifugal pumps are among the most widely used dynamic pump types across industrial sectors due to their simple construction, relatively low cost, and ease of maintenance. The performance of a centrifugal pump is strongly influenced by impeller design, one of which is achieved through modifying the blade configuration into tandem blades—two rows of blades (front and rear) arranged sequentially in a single flow path, separated by a gap that acts as a flow transition zone. This study aims to analyze the effect of modifying a closed impeller into a tandem blade impeller with gap variations of 8°, 10°, 13°, 16°, 19°, 22°, and 25° on centrifugal pump performance using water as the working fluid. The method used is numerical simulation via Computational Fluid Dynamics (CFD) using Ansys Fluent, employing the Realizable k-ε turbulence model, which was validated against experimental data with an average error of 1.22%. Parameters analyzed include head, efficiency, Water Horse Power (WHP), Brake Horse Power (BHP), and torque. The results show that gap variations of 8°, 10°, 13°, and 16° produced higher heads compared to the original closed impeller (14.25 m), with the highest head obtained at a 10° gap (15.38 m). Meanwhile, the 16° gap configuration yielded the highest efficiency of 39.78% at a capacity of 111.6 lpm, surpassing the original closed impeller's efficiency of 39.47%. The 16° gap configuration is considered the most optimal variation, as it simultaneously improves both head and efficiency, with the Best Efficiency Point (BEP) estimated to occur at a capacity of 141 lpm with 42.04% efficiency.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pompa Sentrifugal, Tandem Blades Impeller, Closed Impeller, Variasi Gap, Computational Fluid Dynamics (CFD), Performa Pompa, Centrifugal pump, Tandem Blades Impeller, Closed Impeller, Gap Variation, Computational Fluid Dynamics (CFD), Pump Performance
Subjects:	Q Science > Q Science (General) > Q325.5 Machine learning. Support vector machines. T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics T Technology > TJ Mechanical engineering and machinery > TJ919 Centrifugal pumps--Design and construction.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Rachmania Khoyrun Nisa'
Date Deposited:	30 Jul 2026 06:57
Last Modified:	30 Jul 2026 06:57
URI:	http://repository.its.ac.id/id/eprint/139624

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