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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Abdi Insani
Sakti, Gedhe Angkoso Nur Sofa
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The Effect of Tip Clearance Kaplan Ducted Propeller in Offshore Supply Vessel (OSV) on Hydrodynamics Winarno, Arif; Sakti, Gedhe Angkoso Nur Sofa; Sugianto, Erik
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 21, No 3 (2024): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v21i3.64772

Abstract

A ducted propeller is a modification of a propeller by adding a duct or nozzle. The purpose of using a ducted propeller is to increase thrust, increase propeller efficiency, and encourage better ship movement. This is suitable for Offshore Supply Vessel (OSV) vessels operating on offshore platforms to support oil drilling activities. In designing a kort nozzle, one of the most important components is the tip clearance, the distance between the edge of the propeller and the inner nozzle. The diameter of the kort nozzle can affect the thrust efficiency of the propeller. Due to the blade momentum theory for ducted propellers, the volume of water passing through the propeller should be as large as possible, with the smallest possible flow velocity. In this study, numerical simulations using the Computational Fluid Dynamics (CFD) method were carried out to determine the effect of tip clearance on thrust and torque on a ducted propeller with a MARIN foil 19A nozzle type and tip clearance of 10 mm, 20 mm, and 30 mm. From all models, the highest thrust and torque values were obtained from the nozzle 19A tip clearance 10 mm model with thrust 367,413 kN and torque 315,338 kNm. The relationship between tip clearance and thrust is inversely proportional; the greater the tip clearance, the smaller the value of thrust, and the same is true with torque.
PELATIHAN PEMAKAIAN DAN PERAWATAN ALAT PENJERNIH AIR SIAP MINUM UNTUK SANTRIWATI PONDOK PESANTREN Sugianto, Erik; Dewantara, Belly Yan; Prasutiyon, Hadi; Sakti, Gedhe Angkoso Nur Sofa
Jurnal Abdi Insani Vol 11 No 3 (2024): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v11i3.1844

Abstract

Al-Karimiyyah Islamic Boarding School in Sumenep faces problems in water supply. The female students are forced to use brackish well water for drinking because the availability of potable water is limited, while using the services of a gallon water provider is very expensive. The need for drinking water must be met on an ongoing basis given the large number of female students and staff living there. This training activity aims to increase knowledge and understanding of the use of the reverse osmosis method water purifier. As well as improving the quality of water so that it is suitable for drinking.  The reverse osmosis system will treat and filter water to neutralise taste, odour, and harmful substances, so that it becomes ready-to-drink water. The training method was carried out through workshops and training on the use of tools with reverse osmosis systems that use solar power sources for female students in Beraji Village.  This activity was carried out for three days in the hall of Al-Karimiyyah Islamic boarding school, Braji village, Gapura sub-district, Sumenep district, East Java.   The boarding school residents learnt how to install and maintain a filtration device with reverse osmosis technology to provide ready-to-drink water. The device is placed outdoors for easy access by female students. Solar panel technology is used as the main power source so that this tool is independent in terms of electricity and can be placed in any location. This training activity is also an alternative to providing drinking water that is suitable for consumption, so that it can save time and money. In addition, santriwati also get education about the importance of consuming clean water to avoid disease. Santriwati now have sustainable access to clean drinking water. The application of reverse osmosis technology with solar power not only increases the availability of clean water, but also becomes a solution to electricity scarcity.
Co-Authors Arif Winarno Dewantara, Belly Yan Prasutiyon, Hadi Sugianto, Erik