Analisa Kinerja Pre-Duct Propeller Akibat Bentuk Buritan Kapal Berbasis Simulasi

Prihandanu, Riyan Bagus (2021) Analisa Kinerja Pre-Duct Propeller Akibat Bentuk Buritan Kapal Berbasis Simulasi. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam proses dan perkembangan pembangunan kapal akan selalu menuju pada desain yang ramah lingkungan dan memiliki nilai efisiensi yang tinggi terhadap sisi energi dan ekonomi. Dari sederet nilai efisiensi yang digunakan, dapat diketahui bahwa interaksi antara propeller dan lambung sangat berpengaruh terhadap performa kapal. Sehingga dengan meletakan ESD (Energy Saving Device) sebelum propeller dapat digunakan untuk mengurangi fenomena aksial dan rotasi yang berkontribusi besar terhadap kehilangan energi pada sistem propulsi. Salah satu ESD yang umum digunakan pada zona 1 adalah bentuk ducting atau biasa disebut Pre-Duct. Pada penelitian ini dilakukan simulasi pemasangan Pre-Duct pada beberapa jenis kapal atau Coefficient Block. Pre-Duct akan divariasi bentuk dan diameternya untuk mendapatkan hasil terbaik pada Circular dan Uncircular Pre-Duct. Hasil tersebut akan diimplementasikan pada variasi Pre-Duct sehingga dapat dilihat pengaruh Circular dan Uncircular Pre-Duct pada 3 jenis kapal yang dipilih, yaitu Japan Bulk Carrier (JBC), Tanker dan KRISO Container Ship (KCS). Dari simulasi yang dilakukan nilai efisiensi lambung mengalami kenaikan pada semua jenis kapal sebesar 7.23-16.9% (ηH). Nilai efisiensi relative rotatif mengalami kenaikan 0.61-2.49% (ηR) pada kapal JBC dan Tanker, namun hal sebaliknya terjadi pada kapal KCS yang turun hingga 3%. Sedangkan disisi yang lain, nilai efisiensi open water / propeller mengalami penurunan signifikan yaitu sebesar 7.45-18.57%. Pada akhir pembahasan Circular Pre-Duct memberikan kenaikan Propulsive Coefficient (PC) sebesar 0.3% pada kapal JBC dan 0.6% pada kapal KCS. Untuk Uncircular Pre-Duct tidak memberikan dampak positif pada Propulsive Coefficient pada seluruh jenis kapal. Bentuk buritan berperan penting dalam penambahan PC, bentuk yang ramping memberikan aliran yang lebih baik ketika masuk ke Pre-Duct. Jarak yang optimal tidak akan merusak aliran air yang masuk ke propeller dari buritan kapal. Perubahan jenis kapal dan Coefficient Block tidak berpengaruh terhadap nilai Propulsive Coefficient ketika penambahan Pre-Duct. ====================================================================================================== In the process and development of shipbuilding, it always lead to a design that is environmentally friendly and has high-efficiency values on the energy and economic side. From the efficiency of the hull, relatively rotative and propeller, it is known that the interaction between the propeller and the hull greatly affects the performance of the ship. So that with the addition of ESD (Energy Saving Device) before the propeller it can be used to reduce axial and rotational phenomena that contribute to energy loss in the propulsion system. One of the commonly used ESD in zone 1 is a form of ducting or so-called Pre-Duct. In this study, a simulation of the installation of Pre-Ducts on several types of vessels or Coefficient Blocks was carried out. The shape of the Pre-Duct will be varied. Change the shape and diameter to get the best results on the Circular and Uncircular Pre-Ducts. These results will be implemented in the Pre-Duct variations so that the effect of Circular and Uncircular Pre-Ducts can be seen on the 3 selected vessels, namely Japan Bulk Carrier (JBC), Tanker, and KRISO Container Ship (KCS). From the simulations, the hull efficiency value increased in all types of vessels by 7.23-16.9% (ηH). The relative rotative efficiency value experienced an increase of 0.61-2.49% (ηR) on JBC and Tanker ships, but the opposite happened to KCS ships which decrease by 3%. Meanwhile, on the other efficiency, the efficiency value of open water or propeller has decreased significantly, namely in the amount of 7.45-18.57%. At the end of the discussion the Circular Pre-Duct gave an increase in the Propulsive Coefficient (PC) of 0.3% on JBC ships and 0.6% on KCS ships. The Uncircular Pre-Duct does not have a positive impact on the Propulsive Coefficient on all types of ships. The stern shape plays an important role in the addition of the PC, the slim shape provides better flow when entering the Pre-Duct. The optimal distance will not damage the flow of water into the propeller from the stern of the ship. Changes in ship type and block coefficient do not affect the value of the Propulsive Coefficient when adding the Pre-Duct.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Pre-Duct, Propulsive Coefficient, Energy Saving Device, Coefficient Block, Computational Fluid Dynamics (CFD)
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM751 Resistance and propulsion of ships
Divisions: Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Riyan Bagus Prihandanu
Date Deposited: 03 Mar 2021 23:11
Last Modified: 03 Mar 2021 23:11
URI: https://repository.its.ac.id/id/eprint/83332

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