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All Journal Infotekmesin IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Yusuf Siahaya
Universitas Kristen Indonesia Paulus
Automotive Engineering Computer Science & IT Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Kinerja Kincir Air Overshot dengan Penambahan Lubang pada Sudu Adam Susanto; Atus Buku; Yusuf Siahaya
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.396

Abstract

This study aims to analyze the performance of an overshot water wheel with holes added to the blades, focusing on mechanical power, torque, and efficiency. The experiment was conducted using a laboratory-scale water wheel prototype with a fixed number of eight blades. The experimental variations included the number of holes in each blade (12, 16, and 20) and hole diameters (0.07 m, 0.09 m, and 0.11m), with a blade without holes used as a reference condition. The tests were carried out under relatively constant water flow conditions, with shaft rotational speed measured using a tachometer and torque obtained via a braking method. The results indicate that adding holes to the blades significantly improves the performance of the overshot water wheel. The optimal configuration was achieved with 20 holes and a hole diameter of 0.11 m, producing a maximum power of approximately 21 W, the highest torque, and a maximum efficiency of 7.9%. This study demonstrates that optimizing blade design by adding holes is an effective approach to enhancing the performance of overshot water wheels in small-scale microhydropower applications.  
Mekanisme Kehilangan Tekanan dan Struktur Aliran Gas LPG pada Swivel Joint Style 40 dengan Sudut Gerak 45°: Studi Computational Fluid Dynamics I Putu Redy Irawan; Atus Buku; Yusuf Siahaya
Infotekmesin Vol 17 No 2 (2026): Infotekmesin: Juli 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/

Abstract

Swivel joints are an important component in the loading arm system that affects the efficiency of LPG transfer; however, the characteristics of pressure distribution and flow patterns in a 40° style swivel joint with a rotation angle of 45° have not been widely studied. This study aims to analyze the pressure distribution and flow structure using the Computational Fluid Dynamics (CFD) method with the k–ω SST turbulence model. The simulation results show that the flow is in a turbulent regime with a Reynolds number of around 71000 and a Darcy friction factor of 0.035. The pressure distribution is in the range of −0.0293 to 0.0445 Pa, with the maximum pressure concentrated on the outer side of the bend due to the centrifugal effect, while the minimum pressure appears on the inner side of the elbow, which triggers the formation of secondary flow. Streamline visualization shows the formation of a low-intensity Dean vortex without a significant recirculation zone, with a maximum velocity of around 0.244 m/s. The novelty of this research lies in the integrated analysis of pressure distribution and flow structure in a 40° 45° swivel joint style configuration that represents the actual operating conditions of the loading arm. The research results provide a scientific basis for optimizing the swivel joint design to minimize pressure loss and improve the efficiency of the LPG transfer system.
Co-Authors Adam Susanto Atus Buku I Putu Redy Irawan