Analisa Efek Tip Clearance Dan Duct Shape Terhadap Performa Ducted Propeller Seri Kaplan 4-70 Pada Kapal Tunda

Pratama, Albertus Calvin (2025) Analisa Efek Tip Clearance Dan Duct Shape Terhadap Performa Ducted Propeller Seri Kaplan 4-70 Pada Kapal Tunda. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Propeller sebagai propulsi kapal memiliki fungsi utama untuk menghasilkan gaya dorong dengan cara merubah gaya rotasi yang dihasilkan oleh mesin penggerak utama menjadi gaya translasi yang dapat menggerakkan kapal baik maju maupun mundur. Salah satu seri propeller yang dikembangkan dan dipergunakan secara luas untuk memaksimalkan gaya dorong yang dihasilkan yaitu ducted propeller dengan Seri Kaplan. Ducted propeller merupakan salah satu metode yang umum digunakan pada sistem propulsi kapal yang didesain untuk meningkatkan performa dari propeller dengan mengambil keuntungan dari sebuah fenomena fisik yang bergantung pada bentuk dari duct tersebut. Namun performa dari ducted propeller dipengaruhi oleh beberapa factor, Yongle et Al menemukan adanya efek dari tip clearance terhadap performa dari kapal baik gaya dorong maupun tekanan yang terdistribusi di sekitar propeller. Selain dari tip clearance, Arief et Al (2017) juga menemukan efek dari duct length-nozzle diameter ratio terhadap performa pada propeller yang menunjukkan adanya peningkatan thrust pada rasio yang lebih besar. Pada tesis ini akan dilakukan simulasi numerik untuk mengevaluasi mengenai efek yang ditimbulkan oleh variasi tip clearance dan duct shape pada ducted propeller seri Kaplan 4-70 yang digunakan pada kapal tunda untuk menjadi acuan perancangan ducted propeller di masa yang akan datang. Hasil simulasi menunjukkan bahwa ducted propeller Kaplan Ka 4-70 memberikan peningkatan efisiensi open water hingga 11,03% dibandingkan non-ducted propeller. Evaluasi terhadap variasi tip clearance mengindikasikan bahwa semakin kecil tip clearance, efisiensi cenderung meningkat, namun terdapat ambang batas di mana penurunan tip clearance tidak lagi memberikan peningkatan signifikan. Selain itu, duct shape berpengaruh besar terhadap performa, di mana nozzle 24 menunjukkan efisiensi terbaik. Kombinasi terbaik secara keseluruhan diperoleh pada nozzle 24 dengan tip clearance 5,5 mm, sedangkan untuk efisiensi maksimum dan pada J operasional, kombinasi terbaik adalah nozzle 24 dengan tip clearance 10 mm.
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The propeller, as the ship's propulsion, has the main function of generating thrust by converting the rotational force produced by the main engine into translational force that can move the ship either forward or backward. One propeller series that has been widely developed and used to maximize the generated thrust is the Kaplan Series ducted propeller. The ducted propeller is a commonly used method in ship propulsion systems, designed to enhance the propeller's performance by taking advantage of a physical phenomenon that depends on the shape of the duct. However, the performance of the ducted propeller is influenced by several factors. Yongle et al. found the effect of tip clearance on the ship's performance, including both thrust and the pressure distribution around the propeller. In addition to tip clearance, Arief et al. (2017) also found the effect of the duct length-to-nozzle diameter ratio on propeller performance, showing an increase in thrust at larger ratios. In this thesis, numerical simulations will be conducted to evaluate the effects of variations in tip clearance and duct shape on the Kaplan Series 4-70 ducted propeller used on a tugboat to serve as a reference for future ducted propeller designs. The simulation results show that the ducted Kaplan Ka 4-70 propeller provides an increase in open water efficiency of up to 11,03% compared to the non-ducted propeller. Evaluation of tip clearance variation indicates that smaller tip clearance generally leads to higher efficiency, although there appears to be a threshold below which further reduction no longer yields significant gains. Additionally, duct shape significantly influences performance, with nozzle 24 demonstrating the best efficiency. The optimal combination overall was found with nozzle 24 and a 5,5 mm tip clearance, while the best performance in terms of maximum open water efficiency and at the operational J was achieved with nozzle 24 and a 10 mm tip clearance.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Ducted Propeller, Kaplan Series, CFD, Tip Clearance, Duct Shape
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM464 Towboats. Tugboats V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM751 Resistance and propulsion of ships V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM753 Propellers
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36101-(S2) Master Thesis
Depositing User:	Albertus Calvin Pratama
Date Deposited:	05 Aug 2025 11:37
Last Modified:	05 Aug 2025 11:37
URI:	http://repository.its.ac.id/id/eprint/127013

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