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Journal : KURVATEK

STUDI SIMULASI CFD PENGARUH LEBAR CORD SUDU NACA A 0015 TERHADAP POWER FACTOR TURBIN DARIEUS Harianto Harianto
KURVATEK Vol 4 No 1 (2019): Reka Ruang
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i1.1136

Abstract

AbstrakDiseluruh dunia khususnya di Indonesia saat sedang menghadapi permasalahan kebutuhan energi yaitu disebabkan oleh meningkatnya kebutuhan energi setiap tahunnya yang  sejalan dengan perkembangan industri, jumlah penduduk dan aktifitas manusia, sementara cadangan sumber energi bahan bakar minyak semakin menipis. Pengembangan  sumber energi alternatip saat ini  adalah sumber energi terbarukan yang diantaranya meliputi Solar cell, Turbin energi panas bumu, Turbin energi bayu , dan Turbin energi air . Turbin air Darrieus sumbu vertikal merupakan salah satu turbin air yang berpotensi untuk dikembangkan dan cocok untuk diterapkan pada aliran air sungai di Indonesi.Dalam penelitian ini telah dilakukan pembuatan model simulasi turbin Darieus sumbu vertikal dengan profil sudu NACA A0015 yang tergolong sebagai turbin mikrohidro kecepatan aliran. Diameter rotor 20 cm, 3 buah sudu dengan panjang sudu 25 cm dan variasi lebar cord 6, 7 dan 8 cm  serta  posisi sudut kemiringan sudu tangensial rotor -5o , dioperasikan pada   kecepatan aliran air 1.5 m/detik, yang dilakukan dengan simulasi 3d CFD FLUENT untuk mendapatkan besarnya coeffisien  torsi poros turbin , selanjutnya dilakukan analisis besarnya factor daya. Hasil penelitian ini menunjukkan bahwa  lebar cord 6 cm ( soliditas ) 0.2864 menghasilkan faktor  daya tertinggi sebesar 0.0447  pada putaran poros 160 rpm dan kecepatan air masuk turbin 1.5 m/detik. Abstract Throughout the world, especially in Indonesia when facing problems of energy needs, that is caused by increasing energy needs each year which are in line with the development of industry, population and human activities, while reserves of energy sources of fuel oil are depleting. The development of alternative energy sources is currently a renewable energy source which includes solar cells, hot energy turbines, wind energy turbines and water energy turbines. The vertical axis Darrieus water turbine is one of the water turbines that has the potential to be developed and is suitable to be applied to river water flows in Indonesia.In this research, a vertical axis Darieus turbine simulation model has been made with NACA A0015 blade profile which is classified as a microhydro flow velocity turbine. Rotator diameter 20 cm, 3 blade with 25 cm blade length and variation of cord width 6, 7 and 8 cm and position of rotor tangential angle of rotor -5o, operated at water flow velocity of 1.5 m / sec, which is done with 3D CFD FLUENT simulation to get the coefficient of turbine shaft torque , an analysis of the magnitude of the power factor is then performed. The results of this study showed that the cord width of 6 cm (solidity 0.2864) resulted in the highest power factor of 0.0447 at shaft rotation of 160 rpm and the speed of turbine intake water 1.5 m / sec. Keywords : Daarieus Turbine, NACA blade profile, Power coefficient. Cord width 
EFFECT OF AIR FLOW RATE ON AIR-LIFT- PUMP Amat Agus Salim; Edi Susanto; Daru Sugati; Harianto
KURVATEK Vol 7 No 2 (2022): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v7i2.3777

Abstract

Airlift pump is a series of tools used to transport water and air cargo (muddy) from one place to another. The Airlift pump work system through the pipe media by injecting air into the channel under the submerged pipe. The air pressure from the aerator will push the air to move upward in the same direction through the pipe. Viscous liquids or sludge can be raised using an air-lift-pump. The buoyant force from the air can cause the heavy hydrostatic liquid to become smaller because the air used in the air-lift-pump is injected at the bottom of the pipe. This study used an experimental method by varying the air discharge ratio and using different air injectors. The purpose of this study was to determine the effect of variations in the injection discharge ratio on pump performance and to find the best efficiency for each variation made. The test was carried out with 3 different injector pipes (0.80 mm, 0.54 mm, 0.31 mm). The results showed that variations in the air discharge ratio greatly affect the efficiency and flow rate of water. The highest efficiency occurred in an injector with a diameter of 0.8 mm by 4.1% and the highest efficiency occurred in an injector with a diameter of 0.31 mm by 1.3%. Variation of air discharge with a greater value then the efficiency value will decrease. The water flow rate also changes because the greater the air discharge given, the greater the value of the water flow rate. Keywords : airlift pump, efficiency, variasi rasio debit udara, injector
THE EFFECT OF BIOSOLAR AND PERTAMINA DEX ON POWER PERFORMANCE, TORQUE AND DIESEL FUEL CONSUMPTION Dandung Rudy Hartana; Harianto; Wahid Anwar
KURVATEK Vol 8 No 1 (2023): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v8i1.4030

Abstract

Initially, diesel motor fuel was only diesel, but now there are biodiesel and Pertamina Dex. In order to analyze the performance of a diesel engine, it is necessary to test it using Pertamina Dex and Biosolar. This study used an experimental method with four variations of engine speed, namely 1000 rpm, 2000 rpm, 2500 rpm, and 2500 rpm. The tool used in this research is a type 4JA1 diesel engine, the performance parameters of the diesel engine are power, torque, and specific fuel consumption. The results showed that engine performance using Pertamina Dex fuel was superior to that using biodiesel. The superiority of pertamina dex is the torque at 2500 rpm of 68.992 Nm, the power parameter has increased by 5.246%, while the specific fuel consumption of pertamina dex is 0.132% lower than biodiesel.