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Simulasi Numeris Karakteristik Pembakaran CH4/CO2/Udara dan CH4/CO2/O2 pada Counterflow Premixed Burner Wicaksono, Hangga; Sasongko, Mega Nur; Widhiyanuriyawan, Denny
Jurnal Rekayasa Mesin Vol 8, No 2 (2017)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The high amount of CO2 produced in a conventional biogas reactor needs to be considered. A further analysis is needed in order to investigate the effect of CO2 addition especially in thermal and chemical kinetics aspect. This numerical study has been held to analyze the effect of CO2 in CH4/CO2/OÂ2 and CH4/CO2/Air premixed combustion. In this study one dimensional analisys in a counterflow burner has been performed. The volume fraction of CO2 used in this study was 0%-40% from CH4â€™s volume fraction, according to the amount of CO2 in general phenomenon. Based on the flammability limits data, the volume fraction of CH4 used was 5-61% in O2 environment and 5-15% in air environment. The results showed a decreasing temperature along with the increasing percentage of CO2 in each mixtures, but the effect was quite smaller especially in stoichiometric and lean mixture. CO2 could affects thermally (by absorbing heat due to its high Cp) and also made the production of unburnt fuel species such as CO relatively higher.

PENGARUH MODEL SUDU OVERLAP DAN HELIX PADA PROSES INISIASI PUTARAN TURBIN SAVONIUS Witono, Kris; Nasir, Moh.; Faizal, Elka; Wicaksono, Hangga; Pranoto, Bayu
Otopro Vol 15, No 1 (2019)
Publisher : Jurusan Teknik Mesin Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v15n1.p27-31

This research proposes a new model of overlap and helix blade shape. The overlap shape of the blades gives room to the air flow shortly after pounding the blades. Air flow direction is strived to be able to push the next blade so that the process of the turbine blade rotation becomes more effective. While the helix model is expected to produce a more efficient turbine rotation due to its multilevel shape. The wind speeds tested were 2 m / s, 4 m / s, and 6 m / s. Turbine speed rotation data retrieval is carried out at each additional time. The overlap blade has a greater angular velocity value of 9.4 rad / s at 2 m / s wind speed, 21.9 rad / s at 4 m / s wind speed, and 29.8 rad / s at 6 m / s wind speed.Turbines with multilevel helix blades have a higher level of stability compared to overlap blades. This is because there are two levels of turbine blades which have an angle difference of 600 which can receive more stable wind collisions. However, due to the smaller cross-sectional area of the helix blade turbine (ie 50% of the overlap blade) the effective impact area on the blade is also getting smaller. So that the energy that can be converted is also relatively smaller than the overlapping blade.

Pengaruh Model Sudu Overlap dan Helix pada Proses Inisiasi Putaran Turbin Savonius Witono, Kris; Nasir, Moh.; Faizal, Elka; Wicaksono, Hangga; Pranoto, Bayu
Otopro Vol 15, No 1 (2019)
Publisher : Jurusan Teknik Mesin Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v15n1.p27-31

This research proposes a new model of overlap and helix blade shape. The overlap shape of the blades gives room to the air flow shortly after pounding the blades. Air flow direction is strived to be able to push the next blade so that the process of the turbine blade rotation becomes more effective. While the helix model is expected to produce a more efficient turbine rotation due to its multilevel shape. The wind speeds tested were 2 m / s, 4 m / s, and 6 m / s. Turbine speed rotation data retrieval is carried out at each additional time. The overlap blade has a greater angular velocity value of 9.4 rad / s at 2 m / s wind speed, 21.9 rad / s at 4 m / s wind speed, and 29.8 rad / s at 6 m / s wind speed.Turbines with multilevel helix blades have a higher level of stability compared to overlap blades. This is because there are two levels of turbine blades which have an angle difference of 600 which can receive more stable wind collisions. However, due to the smaller cross-sectional area of the helix blade turbine (ie 50% of the overlap blade) the effective impact area on the blade is also getting smaller. So that the energy that can be converted is also relatively smaller than the overlapping blade.

Analisis Jenis Dan Dimensi Pasir Pembentuk Material Mortar Terhadap Konduktivitas Panas Efektif Ismail, Nova Risdiyanto; Suwandono, Purbo; Hermawan, Dadang; Wicaksono, Hangga
TEKNIK Vol. 44, No. 3 (2023): December 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i3.43966

The solar radiation heat absorbing plate is a major component in solar still applications. The fin absorber plate with mortar material as a heat absorber, heat transfer, and evaporation medium. In the fin absorber plate with mortar material, seawater flows inside the fin body capillarity and undergoes an evaporation process, leaving salt in the pores. Salt in the pores, type, and dimension of sand as the main forming material of mortar will also affect the effective heat conductivity value. This study evaluates salt formation in the pores with various types and dimensions of sand-forming mortar material on effective heat conductivity. The research was conducted experimentally by comparing the types and dimensions of sand-forming mortar. The types of sand used were iron sand (PB) and lichen sand (PL), with sand dimensions of 0.125 and 0.250, respectively. The types and dimensions of sand were formed into mortar with a mixture of 2 sand and one cement. The mortar test was compared with stone material. In the test, heating was applied to the top surface of the mortar and stone using a heating element (heater) with 46.4 W power for 120 minutes. The research resulted in the effective heat conductivity of all mortar materials increasing with increasing heating time and salt in the pores. The mortar material using iron sand with a dimension of 0.125 mm (PB.0.125) has a higher total effective heat conductivity of 0.712 (W/m0C) than PB.0.250, PL.0.125, PL.0.250 and stone.

METODE RCM UNTUK MENINGKATKAN KUALITAS PERAWATAN POMPA SENTRIFUGAL Ulum, Maulana Bahrul; Rarindo, Hari; Wicaksono, Hangga; Dani, Agus
Jurnal Teknologi Vol 17 No 2 (2023): Nopember 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar

PT. Petro Jordan Abadi merupakan perusahaan yang bergerak di bidang kimia dengan produk utama Asam Phosphat. Dalam kegiatan produksi di PT. Petro Jordan Abadi mengoperasikan beberapa mesin produksi salah satunya yaitu Mesin Pompa Sentrifugal. Dalam proses produksi mesin pompa sentrifugal beroprasi secara terus menerus sehingga dapat memnyebabkan kendala dan kerusakan saat proses produksi. Dalam penelitian ini akan melakukan analisis sistem perawatan pada Mesin Pompa Sentrifugal menggunakan metode Reliability Centered Maintenance (RCM). Tujuan dari penelitian ini adalah menentukan nilai keandalan, menentukann penyebab kegagalan/kerusakan dan rencana biaya perawatan dengan minimnya breakdown maka biaya yang dikeluarkan akan lebih berkurang serta mesin dapat bertahan lebih lama diharapkan dengan penerapan perawatan menggunakan metode Reliability Centered Maintenance (RCM) di PT. Petro Jordan Abadi dapat mengurangi angka kerusakan dan gangguan pada Mesin Pompa Sentrifugal, sehingga dapat memaksimalkan penggunaan mesin tersebut.

ANALISIS PENGARUH DIAMETER DAN POSISI DIMPLE PADA VELOCITY STACK TERHADAP DAYA MOTOR BENSIN 155 Cm3 Asrori, Ahmad; Wicaksono, Hangga
JTAM ROTARY Vol 7, No 1 (2025): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v7i1.13165

Penelitian ini bertujuan menguji pengaruh variasi diameter dan posisi dimple pada velocity stack mesin bensin 155 cm³ dengan tujuan untuk meningkatkan tenaga mesin. Diameter dimple yang diuji bervariasi 0,3 cm, 0,4 cm, 0,5 cm, dan 0,6 cm serta posisi pola lurus dan silang untuk menganalisis dampaknya terhadap dinamika aliran udara dan tenaga mesin. Eksperimen dilakukan dalam kondisi terkontrol dengan metrik performa utama seperti output daya dan laju aliran udara. Hasilnya menunjukkan bahwa diameter lesung pipit sebesar 0,4 cm secara optimal meningkatkan tenaga mesin karena peningkatan turbulensi yang mendukung pencampuran udara dan bahan bakar yang lebih baik. Selain itu, pola silang pada dimple memberikan kinerja yang lebih baik daripada pola lurus karena distribusi aliran udara yang lebih merata. Temuan ini menunjukkan bahwa konfigurasi dimple tertentu dapat secara signifikan meningkatkan efisiensi dan kinerja mesin, serta peningkatan tenaga mesin bensin. This study aims to examines the effect of dimple diameter and position variations on the velocity stack of a 155 cm³ gasoline engine with the aim of increasing engine power. The tested dimple diameters varied 0.3 cm, 0.4 cm, 0.5 cm, and 0.6 cm and the positions of the straight and cross patterns to analyze their impact on airflow dynamics and engine power. The experiments were conducted under controlled conditions with key performance metrics such as power output and airflow rate. The results show that a dimple diameter of 0.4 cm optimally increases engine power due to increased turbulence which favors better air and fuel mixing. In addition, the cross pattern in the dimple provides better performance than the straight pattern due to more even airflow distribution. These findings suggest that certain dimple configurations can significantly improve engine efficiency and performance, as well as gasoline engine power gains.

OPTIMASI AERODINAMIKA BODI MOBIL HEMAT ENERGI KEN DEDES ELECTRIC EVO 3 MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS (CFD) Fakhruddin, Muhammad; Wicaksono, Hangga; Baananto, Fauzan; Firmansyah, Hilmi Iman; Sari, Nurlia Pramita; Muzaki, Mochamad; Akbarsyah D, Khelvindra Rizky; Hardyanto, Noveri Dwi
Eksergi Vol. 17 No. 1 (2021): JANUARI 2021
Publisher : Politeknik Negeri Semarang

Aerodynamics is a branch of science that discusses the movement of an object in the air. Aerodynamics comes from the words aero = air and dynamics = force of motion. The study of air forces is a branch of fluid mechanics. This study is a continuation of the study of hydrodynamics, where the science of the motion of air has a close relationship with other sciences. Physics, mathematics, mechanics, meteorology and others are branches of science that are closely related to aerodynamics. Where in the science of aerodynamics, it discusses the principle of stationary air, specifically about the changes experienced by the air when there is a change in geometry. In this study, CFD analysis was carried out to inspect and optimize the airflow through the energy-efficient car body "Ken dedes Evo 3" Malang State Polytechnic to participate in energy-efficient car competitions by following the regulations and packaging requirements in energy-efficient car contests. The aerodynamic analysis of the energy-efficient car was carried out using the ANSYS simulation software. This aerodynamic research aims to reduce the drag coefficient and lift coefficient of energy-efficient cars. In the end, the energy-efficient car Ken Dedes Electric Evo 3 has an improved drag coefficient of 0.03 and a lift coefficient of 0.034. This is obtained from the simulation only on the car body.

HHO Gas Productivity Analysis Using A Dry Cell Type HHO Generator With Variations of Copper and Stainless Steel Electrodes, Electric Current, and NaOH Concentration hadi susilo, sugeng; Aida Nadhifatul Aini, Fica; Wicaksono, Hangga
Journal of Evrímata: Engineering and Physics Vol. 03 No. 02, 2025
Publisher : PT. ELSHAD TECHNOLOGY INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70822/journalofevrmata.vi.120

properties and rapid combustion. However, optimizing the performance of dry cell HHO generators remains a significant challenge. This study investigates the effect of varying electrode materials (copper and stainless steel), electric current, and NaOH concentration on HHO gas production. The key performance indicator used is the flow rate of HHO gas produced. Results show that increasing electric current significantly enhances HHO production, though this relationship is non-linear due to the rise in electrolyte temperature and internal resistance. A higher NaOH concentration increases electrolyte conductivity, improving HHO production, but excessive concentrations can lead to higher temperatures and electrode degradation. Copper electrodes outperformed stainless steel in gas production due to better electrical conductivity, while stainless steel exhibited superior corrosion resistance over time. Optimizing the combination of electrode material, current, and NaOH concentration is crucial for enhancing the performance of dry cell HHO generators, offering valuable insights for hydrogen-based energy systems.

The Effect of Using Cooking Oil as a Lubricant on Engine Temperature and Power Generated with Variations in Surfactant Addition Wicaksono, Hangga; Arif Nur Huda, Muhammad; Alfianto, Alfianto
Evrimata: Journal of Mechanical Engineering Vol. 02 No. 01, 2025
Publisher : PT. ELSHAD TECHNOLOGY INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70822/evrmata.vi.106

Lubricating oil was type of fluid needed by a machine to work. Significant changes in the temperature of the lubricating oil viscosity up to low level made the engine components less lubricated. It caused the engine components to heat up quickly due to the friction between the metals that became greater. Poor quality lubricant could cause deposits to appear in the engine room which resulted in the engine working harder. The purpose of this study was to investigate the effect of the use of cooking oil added with surfactants of estolides and diglycerides with percentages (2.5%, 5%, and 7.5%) as engine lubricants on engine temperature and power produced by motor vehicles. The research method used was an experiment on a 125cc gasoline motorcycle lubricant with standard conditions. The data taken in this study included engine temperature and power. The results showed that with cooking oil mixed with 7.5% estolides surfactants after heating produced power with an average value of 6.52 HP and a mixture of 5% diglyceride surfactant producing an average value of 5.87 HP, which had a higher average value compared to oil rated at 5.37 HP. When using 2.5% estolides, the lowest value was 83.67°C and using a diglyceride percentage of 7.5% produced the highest value, namely 107.03°C. The use of cooking oil had an influence on engine temperature and power. The average power value of 5.71 HP was higher than oil with a value of 5.37 HP. The engine temperature value using cooking oil was 92.7°C lower than oil with a value of 96.63°C

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