The effect of propeller cap angle and fin size of PBCF on propeller performance

Trimulyono, Andi; Jatmiko, Arif Budi; Mulyatno, Imam Pujo; Yudo, Hartono

doi:10.1088/1755-1315/972/1/012045

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…The study of ESD was performed by Trimulyono et al for propeller B-series with the combination of ESD [1]. Later, The study was carried out with some variations in angle and fin diameter of PBCF [2]. The study of propeller B-series was conducted in open water schema using computational fluid dynamics (CFD) by Agung and Anita [3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Mewis Duct Energy Saving Device to Propeller Performance

Trimulyono

Mulyatno

Rachmat

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Installation of ESD (Energy Saving Device) can improve ship propulsion performance. Mewis Duct is one type of ESD (Energy Saving Device) multi-component device that combines nozzle and fin into the nozzle. The structure can minimize losses due to small losses at the ship's stern and rotational losses or loss of thrust in the slipstreams area. Mewis Duct can reduce power by about 3-8% and increase thrust on the propeller by about 2-5%. This study aims to improve the performance of the INSEAN e779a propeller type using Mewis Duct. The modified Mewis ducts are the number of fins four, five, six asymmetrical and four symmetrical fins using the computational fluid dynamics (CFD) approach. The CFD code is based on the RANS (Reynolds - Averaged Navier Stokes) equation with the turbulent model is k-ε. This study found that installing Mewis duct as ESD in a ship increased the propeller thrust by 3-5% and the torque by 3-4%.

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Section: Introductionmentioning

confidence: 99%

The Effect of Mewis Duct Energy Saving Device to Propeller Performance

Trimulyono

Mulyatno

Rachmat

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Although, at J = 0.1, the KT value of 0.566 decreased, reaching its lowest point at J = 1.0 with a KT value of 0.122. Similarly, at J = 0.1, the 10KQ value of 1.053 decreased [39], reaching its lowest point at J = 1.0 with a 10KQ value of 0.308. However, in contrast, the efficiency value had the opposite trend.…”

Section: Propeller Efficiencymentioning

confidence: 91%

Influence Evaluation of Open Propellers with Boss Cap Fins: Case Studies on Types B4-70 and Ka4-70

Berlian Arswendo Adietya,

Husein Syahab,

Mahendra Indiaryanto

et al. 2024

CFDL

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Numerical analysis of fins effect on propeller performance was conducted, specifically using the B4-70 and Ka4-70 propellers. The study investigated different types of fins, including bare fins and PBCF (Propeller Boss Cap Fins) using computational fluid dynamics (CFD) simulations. The explicit algebraic stress model (EASM) based on Reynolds-Averaged Navier-Stokes (RANS) equations and turbulence modeling was employed to determine the optimal results. The main objective of this research was to enhance energy efficiency in ships by examining various open propeller configurations. The CFD simulation results for open propellers B4-70 and Ka4-70, with the addition of boss cap fins, revealed interesting phenomena. When the open propellers B4-70 and Ka4-70 were equipped with PBCF, they would experience an increase in efficiency (η0). This was because the performance of the fins functioned optimally when the advance ratio (J) is high, as evident from the high velocity values. Thus, with higher velocity and lower pressure in the boss cap region at high J values, there was an elevation in thrust force due to the reduction of hub vortex. In the case of open propeller B4-70 with added PBCF, there was an increase in the efficiency value (η0) ranging from 3% to 5% when J varied from 0 to 0.7. Similarly, for propeller Ka4-70 with the addition of PBCF, there was an increase in the efficiency value (η0) ranging from 1% to 3% when J varied from 0 to 0.7. Notably, the use of an Energy-Saving Device (ESD) in the form of PBCF can increase the efficiency of ship propeller, as reported in this paper. Consequently, these findings affirmed the reliability of the overall calculations using the CFD approach.

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“…Rajendran [21] conducted a numerical simulation analysis to investigate the effects of blade angle on the torque generated by twin-blade propellers and developed a twin-blade propeller model with improved torque and performance coefficient. Trimulyono [22] studied the effect of installing propeller boss cap fins on propeller performance using the CFD method. Additionally, Trimulyono [23] also employed the model variation analysis method to study the optimum thrust value of the propeller, as well as the thrust values generated by variations in angle and number of blades.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Performance and Numerical Analysis of the Coaxial Contra-Rotating Propeller Lift System in eVTOL Vehicles

Xu,

Yu,

et al. 2024

Mathematics

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Electric vertical takeoff and landing (eVTOL) vehicles possess high payload transportation capabilities and compact design features. The traditional method of increasing propeller size to cope with high payload is no longer applicable. Therefore, this study proposes the use of coaxial counter-rotating propellers as the lift system for eVTOL vehicles, consisting of two coaxially mounted, counter-rotating bi-blade propellers. However, if the lift of a single rotating propeller is linearly increased without considering the lift loss caused by the downwash airflow generated by the upper propeller and the torque effect of the lift system, it will significantly impact performance optimization and safety in the eVTOL vehicles design process. To address this issue, this study employed the Moving Reference Frame (MRF) method within Computational Fluid Dynamics (CFD) technology to simulate the lift system, conducting a detailed analysis of the impact of the upper propeller’s downwash flow on the aerodynamic performance of the lower propeller. In addition, the aerodynamic performance indicators of coaxial counter-rotating propellers were quantitatively analyzed under different speed conditions. The results indicated significant lift losses within the coaxial contra-rotating propeller system, which were particularly notable in the lift loss of the lower propeller. Moreover, the total torque decreased by more than 93.8%, and the torque was not completely offset; there was still a small torsional effect in the coaxial counter-rotating propellers. The virtual testing method of this study not only saves a significant amount of time and money but also serves as a vital reference in the design process of eVTOL vehicles.

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The effect of propeller cap angle and fin size of PBCF on propeller performance

Cited by 4 publications

References 9 publications

The Effect of Mewis Duct Energy Saving Device to Propeller Performance

The Effect of Mewis Duct Energy Saving Device to Propeller Performance

Influence Evaluation of Open Propellers with Boss Cap Fins: Case Studies on Types B4-70 and Ka4-70

Aerodynamic Performance and Numerical Analysis of the Coaxial Contra-Rotating Propeller Lift System in eVTOL Vehicles

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