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All Journal Piston: Jurnal Teknologi
Amrullah
Politeknik Negeri Ujung Pandang, Makassar
Aerospace Engineering Automotive Engineering Industrial & Manufacturing Engineering Mechanical Engineering Physics

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Analisa Numerik Perilaku Aliran yang Melalui Struktur Persegi La Ode Ahmad Barata; Lukas Kano Mangalla; Amrullah
Piston: Jurnal Teknologi Vol 8 No 2 (2023): Desember 2023
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v8i2.53

Abstract

This study is designed to analyze the flow characteristics aver a square body with variations in the angle of attack of the flow. The force components u, CD, -CPb, CL and St are analyzed numerically. The method used in this research is the Large Eddy Simulation (LES) turbulent model with variations in the angle of incidence of fluid flow on a square test geometry model with cross-section height H = 40 mm (D = H). The results showed that the large angle of incidence of the flow increased the value of CD, CL due to the enlargement of the flow in the downstream wake area. While the CP value also decreased due to the negative pressure gradient of the downstream area enlarged with an increase in the value of the angle of attack of the flow. The angle of attack increases the parameters CDmax = 2.33, CP = -1.87, and St = 0.09 at an angle of -30° while at an angle of 0° the value of CD = 2.05 -CPb = -1.37, St = 0.128. Changes in the angle of incidence of the flow affect the frequency of vortices. The local velocity component (u) decreased.
Uji Eksperimental Aliran Dalam Pipa dengan Variasi Rangkaian Pompa Sentrifugal Amrullah; Akbar Naro Parawangsa; La Ode Ahmad Barata
Piston: Jurnal Teknologi Vol 9 No 1 (2024): Juni 2024
Publisher : Program Pendidikan Vokasi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55679/pistonjt.v9i1.57

Abstract

A pump converts the rotational energy of the shaft and subsequently the movement of the blades into kinetic energy and pressure in the fluid. Pumps can be configured as single, double series, or double parallel, depending on the requirements. This research aims to determine the best performance of a centrifugal pump installation with variations in head and configuration. The method used in this research is experimental, utilizing a centrifugal pump arranged with water as the fluid. The results show that single and double series configurations are more suitable for applications requiring stable flow despite changes in head. Parallel configurations produce higher speeds compared to single and double series configurations, but speed decreases with increasing head. The single pump's efficiency increases to 40.5% with an increase in head. Efficiency in the series configuration increases to 50.1%, higher than the single pump at the same head. Efficiency in the double parallel configuration increases to 80.1%, indicating that the parallel pump is the most efficient at higher heads. For applications requiring high efficiency, the double parallel pump configuration is the best choice. Based on the analysis results, it can be concluded that the double parallel pump configuration provides the best performance with the highest efficiency at 80.1%, and the highest discharge rate of 43.2 l/min. The double parallel pump configuration is the most efficient and effective for applications requiring optimal pump performance at higher heads.
Co-Authors Akbar Naro Parawangsa La Ode Ahmad Barata Lukas Kano Mangalla, Lukas Kano