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All Journal Teknik Mesin "TEKNOLOGI" Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) VANOS Journal of Mechanical Engineering Education Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat Jurnal Engine: Energi, Manufaktur, dan Material Jurnal Pendidikan Vokasi Otomotif Asean Journal of Science and Engineering (AJSE) IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) JURNAL ILMIAH TEKNIK INDUSTRI DAN INOVASI (JISI) Jurnal Abmas
Muhammad Noor, Ridwan Adam
Universitas Pendidikan Indonesia
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Energy Engineering Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Analisis Pengaruh Bentuk dan Diameter Comb terhadap Karakteristik Aliran Miniatur Wind Tunnel Menggunakan Computational Fluid Dynamics Fajrin Gimnastiar; Yusep Sukrawan; Tatang Permana; Muhamad Maris Al Gifari; Ridwan Adam Muhamad Noor
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.482

Abstract

This study aimed to determine the comb configuration that provides the most uniform flow distribution with low turbulence and pressure loss. Four comb configurations, namely circular, square, 3 mm-diameter hexagonal, and 6 mm-diameter hexagonal configurations, were analyzed using Autodesk Computational Fluid Dynamics under steady-state conditions with an inlet velocity of 30 m/s. We evaluated flow characteristics based on mean velocity, velocity standard deviation, coefficient of variation, uniformity index, turbulence intensity, and pressure drop. With a test-section hydraulic diameter of 89 mm, the Reynolds number of the main flow was calculated as 1.81 × 10⁵. The results showed that the 6 mm-diameter hexagonal comb performed best, with a mean velocity of 29.982 m/s, a velocity standard deviation of 0.517 m/s, a coefficient of variation of 1.725%, a uniformity index of 99.281%, a turbulence intensity of 0.608%, and a pressure drop of 0.592 kPa. This configuration produced the most uniform velocity distribution, low velocity fluctuation and turbulence intensity, and low pressure loss. Therefore, the 6 mm-diameter hexagonal comb was selected as the best configuration.
Analisis Nozzle dan Diffuser terhadap Distribusi Aliran pada Open Circuit Wind Tunnel menggunakan Simulasi Computational Fluid Dynamic (CFD) Sahrul Barokah; Yusep Sukrawan; Tatang Permana; Muhamad Maris Al Gifari; Ridwan Adam Muhamad Noor
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.487

Abstract

This study analyzes the effect of the nozzle and diffuser on airflow distribution in an open-circuit wind tunnel using Computational Fluid Dynamics simulation. The model was created in Autodesk Inventor and simulated in Autodesk CFD at an airflow velocity of 6 m/s, under steady-state conditions, using the k-ε turbulence model. The simulation stages included model development, meshing, boundary condition setup, and post-processing. The simulation results show that the maximum velocity at the nozzle reached 5.3 m/s, increased to 21,08 m/s at the test section, then decreased to 19,17 m/s at the diffuser, with static pressure gradually increasing from 101.150 Pa at the nozzle to 101.297 Pa at the diffuser, indicating a pressure recovery process consistent with the diffuser function. This study's novelty lies in the stepwise quantitative analysis of velocity and pressure distributions at each segment of a laboratory-scale open-circuit wind tunnel using Autodesk CFD simulation, supported by a mesh-independence test, which has not been widely reported in similar previous studies.
Pengaruh Optimasi Air Fuel Ratio melalui ECU Juken 5 terhadap Daya dan Torsi Mesin Yamaha Aerox 155 Muhammad Fahrizal Faisol; Yusep Sukrawan; Tatang Permana; Ridwan Adam Muhamad Noor
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.484

Abstract

This study aimed to analyze the effect of Air Fuel Ratio (AFR) variations obtained through tuning of a Juken 5 programmable ECU on the performance of a Yamaha Aerox 155 engine. The study used an experimental method with a chassis dynamometer, comparing the initial run condition with the tuned condition at a target AFR of 12.8:1. Testing was conducted under Wide Open Throttle (WOT) conditions using Pertamax RON 92 fuel, with maximum power and torque as the main performance parameters. The results showed that the initial condition with an AFR of 10–11 produced a maximum power of 20.07 HP and torque of 10.33 ft-lbs. After final tuning at an AFR of 12.8, maximum power increased to 22.54 HP at 10,260 rpm, representing a 12.3% increase, while maximum torque increased to 11.59 ft-lbs at 10,200 rpm, representing a 12.2% increase. These results indicate that stabilizing the AFR at 12.8:1 was associated with improved engine performance at high engine speeds. However, the relationship was not statistically tested, so the observed improvements cannot be considered statistically significant.
Co-Authors A.A. Ketut Agung Cahyawan W Ade Angraini Nasution Ade Permana Albiyan Niezar Rozi Aprillia, Rheihanita Noer Darmawan, Bambang Doni Fajar Ramadhan Ega Taqwali Berman Eka Muhammad Dzikra Faiz Arkan Yulianto Fajrin Gimnastiar Fani Aditya Faza, Ibnu Nur Febriyani, Githa Fitri Gilang Ciptadi Mahatkarsa Ibnu Mubarak Ilyasa, Aditya Nur Iqbal Imaduddin Iyep Sutia Kamin Sumardi Muhamad Maris Al Gifari Muhammad Fahrizal Faisol muhidin, asep Mumu Komaro Nandang Raihan Noviyana, Kiki Nurhadi, Idham Prasetyo, Rachmat Adi Pratama, Alfian Syahbari Pujangga, Jajang Rika Andriani Sahrul Barokah Sriyono Sriyono Sriyono, S Sukrawan, Yusep Sutia, Iyep Tatang Permana, Tatang Wahid Munawar Widyaningsih, Indri Wuskha, Zainul Yundari, Yundari Yusron, Willi Nur