Analisa Pengaruh Sudut Dan Tebal Kisi Pengaman Terhadap Performa Bow Thruster Menggunakan Metode CFD

Chasanah, Uswatul (2016) Analisa Pengaruh Sudut Dan Tebal Kisi Pengaman Terhadap Performa Bow Thruster Menggunakan Metode CFD. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penambahan bow thruster pada kapal sekarang telah banyak dilakukan. Namun, dengan dilubanginya lambung kapal maka diperlukan penambahan kisi pengaman pada setiap ujung tunnel dari bow thruster. Hal ini dikarenakan dengan penambahan bow thruster yang mana diameter dari tabung dan lambung yang terbuka akibat tunnel dari bow thruster serta efisiensi thruster yang tinggi akan menambah tahanan kapal terutama saat kapal bergerak (John, L. Beveridge, 1972). Peletakkan kisi pengaman disarankan searah vertical terhadap aliran air yang melalui tunnel untuk mengurangi momentum bagian depan dan belakang dari tunnel yang diakibatkan aliran air yang melewatinya (English, 1966). Selain peletakkan secara vertical, peletakkan secara horizontal dari kisi pengaman juga bisa mengurangi static merit coefficient C dengan menambahkan jumlah batang dari kisi pengaman (Taniguchi,1966). Berdasarkan penelitian menggunakan metode CFD (Computational Fluid Dynamic) yaitu dengan variasi ketebalan dan banyaknya batang kisi pengaman, semakin tebal kisi pengaman dan semakin banyak kisi pengaman bisa menambah thrust dan torque yang dihasilkan bow thruster. Seperti thrust yang didapatkan untuk kisi sebanyak 4 batang adalah 13.049 kN dan torque 1.1820 kNm sementara kisi dengan jumlah 12 batang dengan tebal yang sama dapat menghasilkan thrust sebesar 13.085vi kN dan torque sebesar 1.1853 kNm. Namun hal tersebut berbanding terbalik dengan apabila sudut kisi pengaman dirubah, semakin besar sudut kisi pengaman, maka thrust dan torque nya akan berkurang, jika dengan sudut 00 thrust yang dihasilkan oleh bow thruster sebesar 13.366 kN dan torque sebesar 1.2103 kNm. Sementara jika sudutnya ditambah menjadi 300 thrust yang dihasilkan bow thruster sebesar 13.164 kN dan torque sebesar 1.1922 kNm. Dan untuk tahanan kapal, semakin banyak jumlah batang maka sakin berkurang pula tahanan yang dihasilkan, namun penurunannya tidak terlalu signifikan ======================================================================================================= The addition of bow thruster on the vessel have now been carried out. However, with the hole in the hull will required to add of a grating on each end of the tunnel bow thruster. This is because with the addition of a bow thruster which the diameter of the tube and open gastric result of the bow thruster tunnel thruster and high efficiency will add to arrest the ship, especially when the ship moves (John, L. Beveridge, 1972). The placement of the suggested safety grating in the direction vertical to the flow of water through the tunnel to reduce the momentum of the front and rear of the tunnel caused the flow of water through it (English, 1966). In addition to laying vertically, horizontally laying of the security grating can also reduce static merit coefficient “C” by adding the number of stems of safety grating (Taniguchi, 1966). Based on research using CFD (Computational Fluid Dynamics) with the thickness variation and the number of rods grating, grating grew thicker and more grating can add thrust and torque of bow thruster. As thrust obtained for the grid as much as 4 rods is 13. 049 kN and torque 1.1820 kNm provisional grid with the number 12 sticks with the same thickness can produce a thrust of 13.085 kN and a torque of 1.1853 kNm. But itviii was inversely proportional when the angle of grating was changed and grating angle was greater , then thrust and torque will be reduced, if the angle 00 thrust of the bow thruster was 13.366 kN and a torque was 1.2103 kNm. Meanwhile, if the angle was increased to 300 the thrust of bow thruster was 13 164 kN and a torque was 1.1922 kNm. And the resistance of ship, if the number and the thickness of grating increase, so the resistance was decrease, but the decrease was not significant

Item Type: Thesis (Undergraduate)
Additional Information: RSSP 623.870 113 Cha a
Uncontrolled Keywords: Bow Thruster, CFD, Kisi Pengaman, Thrust, Torque
Subjects: T Technology > T Technology (General) > T57.62 Simulation
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM773 Ship propulsion, Electric
Divisions: Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 31 Mar 2020 06:48
Last Modified: 31 Mar 2020 06:48
URI: https://repository.its.ac.id/id/eprint/75624

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