ANALISIS PENGARUH VARIASI TIP CLEARANCE TERHADAP PERFORMA PUMP AS TURBINE MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS

Aan Saputra, Kallvian (2026) ANALISIS PENGARUH VARIASI TIP CLEARANCE TERHADAP PERFORMA PUMP AS TURBINE MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS. Bachelor thesis, Institut Teknologi Kalimantan.

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Abstract

Sistem Pumped Hydro Energy Storage (PHES) skala mikro merupakan salah satu solusi penyimpanan energi terbarukan yang efisien dan ekonomis. Pump as Turbine (PAT) berbasis pompa sentrifugal tipe end-suction semi-open impeller berpotensi digunakan pada sistem tersebut, namun performanya dipengaruhi oleh tip clearance, yaitu celah antara ujung sudu impeller dan dinding casing. Penelitian ini bertujuan menganalisis pengaruh variasi tip clearance 1 mm, 2 mm, dan 3 mm terhadap efisiensi hidrolik serta karakteristik aliran internal PAT pada debit 0,0035 m³/s dan putaran 750 rpm. Simulasi Computational Fluid Dynamics (CFD) dilakukan menggunakan ANSYS Fluent dengan model turbulensi k-ω SST dan pendekatan Multiple Reference Frame (MRF). Validasi terhadap data eksperimen Ayad dkk. (2015) menunjukkan error head sebesar 5,89%–13,03% dengan tren yang serupa. Hasil simulasi menunjukkan bahwa peningkatan tip clearance menurunkan efisiensi hidrolik dari 59,57% menjadi 57,27%, meningkatkan tekanan inlet, serta menurunkan torsi. Visualisasi aliran menunjukkan perkembangan Tip Leakage Flow dan Tip Leakage Vortex yang lebih intens sehingga meningkatkan rugi-rugi hidrolik. Tip clearance 1 mm merupakan konfigurasi optimal dengan efisiensi tertinggi dan gangguan aliran paling kecil.

Item Type:	Thesis (Bachelor)
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Jurusan Teknologi Industri dan Proses > Teknik Mesin
Depositing User:	Kallvian Aan Saputra
Date Deposited:	13 Jul 2026 03:28
Last Modified:	13 Jul 2026 03:28
URI:	http://repository.itk.ac.id/id/eprint/26028

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