Comparison of different propeller boss cap fins design for improved propeller performances

Gaggero, Stefano; Martinelli, Mattia

doi:10.1016/j.apor.2021.102867

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…In this study, the Propeller Ka4-70 with Nozzle PBCF Divergent experienced a large pressure at low speeds J = 0.1 to J = 0.5, thus a solution was needed to decrease the pressure. While previous studies propeller ducted with different PBCF [32]. The velocity of the Ka4-70 Propeller without Nozzle 19A and PBCF divergent strengthen the results of the CFD simulation for the pressure value (see Figure 11).…”

Section: Resultssupporting

confidence: 67%

Characteristics Investigations of Ducted Ka4-70 Series Propeller with Boss Cap Fins Using Numerical and Experimental Method

Berlian Arswendo Adietya,

I Ketut Aria Pria Utama,

Wasis Dwi Aryawan

et al. 2023

CFDL

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Unconventional system that are generally adopted for ship propulsion are Ducted Propellers. These devices have recently been studied with medium-fidelity computational fluid dynamics code (based on the potential flow hypothesis) with promising results. Numerical and experimental comparison of ducted propeller with PBCF, case studies with Propeller Ka4-70 used combination ducted and PBCF Divergent. The study was done numerically using computational fluid dynamics (CFD) approach. The solver is based on the Reynolds-Averaged Navier-Stokes (RANS) solutions and turbulence modelling explicit algebraic stress model (EASM). The test data was obtained from CFD simulations consisting of the open propeller and combination Nozzle plus PBCF, but the experiment was done to Nozzle and PBCF only. All measurements were carried out from J = 0 to J = 1.0 with speeds from 0 m/s to 2.445 m/s. The results of the comparative investigation cases between numerical and experiment analysis from Ka4-70 propellers with Nozzle 19A and PBCF Divergent appears that between CFD and experiments, several phenomena are seen. (i) the Ka4-70 propeller without Nozzle 19A and PBCF divergent experienced large pressure at low-speed J = 0.1 to high-speed J = 0.7, but Ka4-70 propeller with Nozzle and PBCF divergent reach highest pressure at J = 0.1 to J = 0.5; (ii) the Ka4-70 propeller without 19A nozzle and PBCF divergent increases the flow velocity at the boss cap fins but does not increase the axial induce velocity, while Ka4-70 propeller using nozzle and PBCF divergent increases the axial induce velocity of the blade, but does not increase the flow velocity of the boss cap fins; (iii) Ka4-70 propeller without Nozzle and PBCF value increase of propeller η0 to 12% when ESD added in the form of Nozzle and PBCF when J is high, from J = 0.7 to J = 1.0. ; (iv) Ka4-70 propellers with Nozzle 19A and PBCF Divergent has very similar η0 from J=0 to J=1.0. CFD approach are still appropriate to be relied upon for the overall simulation.

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Section: Resultssupporting

confidence: 67%

Characteristics Investigations of Ducted Ka4-70 Series Propeller with Boss Cap Fins Using Numerical and Experimental Method

Berlian Arswendo Adietya,

I Ketut Aria Pria Utama,

Wasis Dwi Aryawan

et al. 2023

CFDL

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“…As expected, on the pressure side, a zone of high pressure is observed at the fin's leading edge and on the boss cap, which needs to be minimized to further reduce the drag and, therefore, increase the efficiency. Recently, ducted PBCFs (i.e., PBCFs inside a nozzle) were investigated as an attempt to mitigate possible side effects of conventional PBCFs, e.g., secondary vortical structures from the PBCFs tip, while not largely compromising the beneficial effects [20]. Finally, to ensure the optimized PBCFs are practicably feasible in real-life tions, a comprehensive yield strength analysis was performed.…”

Section: Performance Of the Propeller/rudder System With The New Opti...mentioning

confidence: 99%

Improve Ship Propeller Efficiency via Optimum Design of Propeller Boss Cap Fins

et al. 2023

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This paper aims to cost-effectively improve the energy efficiency of large vessels in shipping by the optimum design of propeller boss cap fins (PBCFs). First, a model propeller of the modern four-blade propeller in a Ro-Ro ship, with no boss cap fin in its original design, is experimentally and numerically investigated. The computational fluid dynamics (CFD) model reproduced all the experiments very well. Then, the CFD model is used to conduct a comprehensive optimum design of PBCFs for the down-scaled propeller. Besides the commonly used rectangular PBCFs, nine airfoils are investigated, due to their favorable lift-to-drag ratio and great potential of being effective PBCFs. The best performing profile, among the 10 shapes, is chosen as the PBCF for further optimization. Finally, the optimum design of the PBCFs for the propeller/rudder system is achieved. It was found to yield remarkable efficiency gains for the modern propeller/rudder system under both design and off-design operation conditions, mainly due to the suppressed hub vortex and partly due to the extra thrust. The yield strength analysis confirmed that the optimum design is feasible in practice and can be used in industrial vessels. The generalized criteria for the optimum design of PBCFs also benefit other propeller/rudder systems for cost-effective energy saving.

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“…As a non-standard design, scale effects can also be an issue [18]. Probably the most popular ESD in Zone II is the Propeller Boss Cap Fin (PBCF), which reduces the hub vortex [19]. Savings range from 1-2% with the number of fins usually equal to the number of propeller blades.…”

Section: Overview Of Energy Saving Devicesmentioning

confidence: 99%

Hydro-structural issues in the design of energy saving devices for ships

Bakica,

Vladimir,

Senjanović

2023

Rad Hrvatske akademije znanosti i umjetnosti

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The shipping sector is currently under growing pressure concerning the GHGs emission restriction prescribed by the International Maritime Organization (IMO). Improving the efficiency of the fleet has always been an attractive subject to the shipowners, but with the new regulations, the reduction in fossil fuel consumption has switched from optional economic benefit to a rule. One of the ways for the ship to comply with the new regulations is by installing or retrofitting Energy Saving Devices (ESDs). The ESDs exploit the axial and rotational energy losses inevitably produced by the propeller operation. The ESDs differ in shape, position and kind of energy to be recovered. This article gives an overview of the current trends and practices in the field of the ESDs, along with their classification and type of operation. Furthermore, besides the hydrodynamic design, which still holds the primary importance, structural issues are also addressed, since this subject is rarely investigated in the literature. Given the complex flow field of the ESDs influenced by propeller, ship motions, wake field and waves, applicability of numerical models is described in detail, whereby the state-of-the-art approaches are clearly highlighted. Overall, the ESDs are expected to further mature in the future given the rigid rules, the promising potential of efficiency improvements they offer and the lowcost of installation.

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Comparison of different propeller boss cap fins design for improved propeller performances

Cited by 13 publications

References 17 publications

Characteristics Investigations of Ducted Ka4-70 Series Propeller with Boss Cap Fins Using Numerical and Experimental Method

Characteristics Investigations of Ducted Ka4-70 Series Propeller with Boss Cap Fins Using Numerical and Experimental Method

Improve Ship Propeller Efficiency via Optimum Design of Propeller Boss Cap Fins

Hydro-structural issues in the design of energy saving devices for ships

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