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All Journal TEKNIK Rekayasa Mesin Journal of Energy, Mechanical, Material and Manufacturing Engineering Machine : Jurnal Teknik Mesin KURVATEK Journal of Mechanical Design and Testing (JMDT) Jurnal Locus Penelitian dan Pengabdian PELS (Procedia of Engineering and Life Science) Prosiding Seminar Nasional Ilmu Teknik
Bramantya, Muhammad Agung
Departemen Teknik Mesin Dan Industri, Fakultas Teknik, Universitas Gadjah Mada. Jl. Grafika 2, Yogyakarta 55281, Indonesia
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Social Sciences

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STUDY OF ADDITIONAL FIN TO INCREASE EFFICIENCY OF SUPERHEATER AT HEAT RECOVERY STEAM GENERATOR Bramantya, Muhammad Agung
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1002

Abstract

Power plants are part of industrial facilities used to produce and generate electricity from various power sources; one of those is PLTGU (Pembangkit Listrik Tenaga Gas dan Uap or Gas and Steam Power Plant). PLTGU is a combined cycle between PLTG and PLTU. It is necessary to achieve a high-capacity target for the PLTGU to increase the generator's efficiency. One way to increase the efficiency of gas and steam power plants is by optimizing heat transfer in the Heat Recovery Steam Generator (HRSG). HRSG has several modules such as superheater, evaporator, economizer, and preheater. One that plays an essential role in absorbed high-temperature steam from the gas turbine is the superheater. The function of the superheater is to utilize the heat from the flue gas to reheat the fluid needed for the steam turbine. In this research, improvements of superheater were made with several fin variations at HRSG PLTGU. Variable of superheater refer to data on the layout of the HRSG PLTGU. Autodesk Inventor is used to modeling flue gas domain, tube, and fin. Additional of the fin has the purpose of optimizing heat transfer distribution in steam through a tube, such as an outlet temperature and efficiency of steam in tube superheater. The use of CFD (Computational Fluid Dynamic) with ANSYS Fluent could use to determine the temperature distribution of the superheater. The most optimal efficiency and outlet temperature of variation fin is the annular fin variation compared to the rectangular and straight fin variations.
The Analysis of Target Drone Wing Sweep Angle on Dynamic Stall Condition with Pitch Rate Variation using Computational Fluid Dynamics Bramantya, Muhammad Agung; Nugroho, Gesang
TEKNIK Vol 46, No 3 (2025): Juli 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i3.54148

Abstract

A target drone is a type of Unmanned Aerial Vehicle (UAV) with a special mission as a shooting target in the military field. Target drones must be able to fly at high speeds and be agile. This study discusses the influence of the wing sweep angle on the aerodynamic performance of a target drone during dynamic stall conditions. Banshee Whirlwind-like model is used as a research object in this study with the adjustment of the empennage design to a V-Tail configuration. Furthermore, the wing sweep angle was varied to determine its effect on dynamic stall conditions using Computational Fluid Dynamics (CFD) in transient conditions. The wing sweep angle variations used were 5°, 20°, 35°, and 50°, whereas the dynamic stall condition was varied using pitch rates of 3.6°/s, 6°/s, and 18°/s. The aerodynamic performance discussed relates to the lift force, drag force, efficiency, stall angle, lateral stability, and stall development phase. The results of this study indicate that a wing sweep angle of 50° is the most optimal design in terms of stall condition, stability, and maneuverability.
Numerical Simulation of the Effects of Biodiesel Fuel Use on the Performance of the SWD 9TM 410 Engine Rendri Julian Restiawan; Muhammad Agung Bramantya; Willie Prasidha
Jurnal Locus Penelitian dan Pengabdian Vol. 5 No. 6 (2026): JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v5i6.6007

Abstract

The use of B40 Biodiesel as the main fuel in the Diesel Power Plant (PLTD) within PT PLN Nusantara Power UP Kapuas reflects the government's policy to reduce fuel oil imports and support the energy transition to renewable sources. In the SWD 9TM 410 engine at ULPLTG/D Siantan, the use of B40 Biodiesel provides significant changes to combustion characteristics, engine performance, and exhaust emissions. This study aims to model and analyze the combustion process of B40 Biodiesel using the Computational Fluid Dynamics (CFD) method through ANSYS Forte software with a multicomponent chemical mechanism approach. Simulation was carried out in the combustion chamber domain of cylinder 1 based on the actual geometry of the engine with output parameters in the form of peak pressure (Pmax), ignition delay (ID), rate of heat release (RoHR), indicated horsepower (IHP), temperature distribution, and formation of NOx and CO2 emissions. Validation was carried out using experimental data from engine operation tests. The simulation results show that the variation of the biodiesel mixture has an influence on combustion characteristics, engine performance, and the formation of exhaust gas emissions. B100 exhibited a 6.4% lower power output than B0 due to its lower heating value. In addition, differences in fuel characteristics result in variations in maximum cylinder pressure values, heat release rates, combustion temperatures, and NOx and CO2 emission concentrations at each loading level. Under the simulated conditions, the increase in the biodiesel fraction showed a tendency to produce lower combustion temperatures and NOx emissions than B0. The findings show that the fuel composition plays an important role in determining the combustion and emission characteristics of the SWD 9TM 410 diesel engine.
Co-Authors Anwar Syarifudin Faruq Avero Azhar Fathoni, Burhanudin Gesang Nugroho Rendri Julian Restiawan Suryolaksono, Muhammad Ramadhani Willie Prasidha Yosua Heru Irawan Yunanto Handy Nugroho