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All Journal JAST : Jurnal Aplikasi Sains dan Teknologi IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Jurnal Polimesin
Umi Kulsum
Universitas Qomaruddin
Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Performance evaluation of a laboratory-scale Pelton turbine under variable nozzle distance and valve opening Aini Lostari; Didik Sugiono; Miftahul Ulum; Umi Kulsum; Yudi Hartono
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8200

Abstract

Pelton turbines are impulse turbines widely used in micro-hydro power systems operating under high-head and low-flow conditions. Their performance depends strongly on the quality of the water jet impacting the runner buckets, which is influenced by nozzle distance and valve opening. This study experimentally investigated the effects of nozzle distance (60, 70, and 80 mm) and valve opening (30°, 60°, and 90°) on the hydraulic power, turbine power, electrical power, and efficiency of a laboratory-scale Pelton turbine. Turbine rotational speed was measured using a tachometer, while voltage and current were measured using a multimeter to determine power output. The results showed that increasing the valve opening increased hydraulic, turbine, and electrical power due to higher flow rate and jet kinetic energy. However, the turbine efficiency showed non-linear behavior because it was influenced by the quality of the jet and the effectiveness of momentum transfer. The maximum turbine power of 10.52 Watts and electrical power of 10.58 Watts were obtained at a nozzle spacing of 80 mm and a valve opening of 90°. Meanwhile, optimum efficiency was achieved at a nozzle distance of 80 mm and a valve opening of 30%, indicating that optimum conditions do not always occur at maximum flow. The results of this study indicate that the combination of nozzle distance and valve opening significantly influences Pelton turbine performance and is important for optimizing laboratory-scale micro-hydro systems.
Investigasi Experimental Jumlah Sudu Dan Kecepatan Angin Terhadap Performa Turbin Savonius Tipe S Didik Sugiono; Shultoni Mahardika; Aini Lostari; Novi Indah Riani; Umi Kulsum; Baharuddin Putra Pamungkas
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.399

Abstract

Wind energy is a potential renewable energy source in Indonesia, but the relatively low wind speed requires efficient turbine technology. The Savonius turbine has become an alternative choice for generating electrical energy. This research aims to determine the performance of the Savonius type-S turbine with blade numbers of 3, 5, and 7 at different wind speeds. The method used was an experiment conducted in a laboratory-scale wind tunnel simulator, with testing conducted across three blade configurations at wind speeds of 6, 7, and 8 m/s. The research results show that the 3-blade turbine achieves optimal torque at all wind speeds, with a maximum of 0.24 Nm at 8 m/s. The maximum wind power is obtained with the 7-blade turbine, reaching 167 watts at 8 m/s. The optimal turbine power also occurs with the 3-blade configuration, with the highest value being 10.30 watts at 8 m/s. The highest turbine efficiency is achieved by the 7-blade turbine, which is 31.85% at 8 m/s. Based on these results, it is concluded that the number of blades affects the performance characteristics of the Savonius type-S turbine. The 3-blade configuration produces the best torque and turbine power, while the 7-blade configuration excels in wind power and efficiency.
Inovasi Mesin Pencampur Berbasis Otomasi untuk Mengoptimalkan Produksi Jamur Tiram di Desa Kare Kabupaten Madiun Nur Ihda Farikhatin Nisa; Vevi Maritha; Juwari Juwari; Agung Prasongko; Muhammad Wahyue Nesaputro; Achmad Aminudin; Umi Kulsum; Avip Kurniawan; Ahmad Misfa Kurniawan
JAST : Jurnal Aplikasi Sains dan Teknologi Vol 9, No 2 (2025): EDISI DESEMBER 2025
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/jast.v9i2.7600

Abstract

Oyster mushrooms are one of the leading export commodities in Madiun Regency, particularly in Kare Village. The region's cool and fertile environment offers significant potential for mushroom cultivation, providing a source of income and business opportunities for the community. However, the baglog mixing process is still carried out manually. This community partnership empowerment program was designed to enhance the production capacity of farmer groups by applying an automation-based mixer machine to accelerate the baglog preparation process. The program consisted of several stages, including socialization, training in technology utilization, machine implementation, mentoring, evaluation, and planning for program sustainability. The implementation results showed that the mixing time was reduced from 2.5 hours to approximately 1 hour for 300 kg of materials. Production capacity increased significantly from an average of 95 to 190 baglogs per day. The improvements in time efficiency, reduction of manual labor, and enhanced homogeneity of materials demonstrate that this program has provided a tangible impact in increasing the productivity and sustainability of oyster mushroom farmer groups in Kare VillageABSTRAKJamur tiram merupakan salah satu komoditas ekspor unggulan di Kabupaten Madiun, khususnya di Desa Kare. Kondisi wilayah yang sejuk dan subur menjadikan desa ini memiliki potensi besar dalam pengembangan budidaya jamur tiram sebagai sumber pendapatan dan peluang usaha masyarakat. Namun, proses pencampuran bahan baglog masih dilakukan secara konvensional. Program Pemberdayaan Kemitraan Masyarakat ini dirancang untuk meningkatkan kapasitas mitra dalam aspek produksi melalui penerapan mixer machine berbasis otomasi guna mempercepat proses pembuatan baglog. Tahapan kegiatan meliputi sosialisasi, pelatihan penggunaan teknologi, implementasi mesin, evaluasi dan pendampingan, serta perencanaan keberlanjutan program. Hasil implementasi menunjukkan bahwa waktu pencampuran dapat dipangkas dari 2,5 jam menjadi sekitar 1 jam untuk kapasitas 300 kg bahan. Sedangkan kapasitas produksi meningkat signifikan dari rata-rata 95 baglog per hari menjadi 190 baglog per hari. Efisiensi waktu, pengurangan beban tenaga kerja, serta peningkatan homogenitas bahan menunjukkan bahwa program ini memberikan dampak nyata terhadap peningkatan produktivitas dan keberlanjutan usaha kelompok tani jamur tiram di Desa Kare
Co-Authors Achmad Aminudin Agung Prasongko Ahmad Misfa Kurniawan Aini Lostari Avip Kurniawan Baharuddin Putra Pamungkas Didik Sugiono Juwari Juwari Miftahul Ulum Muhammad Wahyue Nesaputro Novi Indah Riani Nur Ihda Farikhatin Nisa Shultoni Mahardika Vevi Maritha Yudi Hartono