Blockage effect influence on model-scale marine propeller performance and cavitation pattern

Eduardo Tadashi Katsuno; João Lucas Dozzi Dantas

doi:10.1016/j.apor.2021.103019

Blockage effect influence on model-scale marine propeller performance and cavitation pattern

Eduardo Tadashi Katsuno^*, João Lucas Dozzi Dantas

^*Corresponding author for this work

Naval Architecture, Ocean And Marine Engineering

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

28 Downloads (Pure)

Abstract

The blockage effect is one of the drawbacks in the use of cavitation tunnels, which may considerably interfere in the measurements of the hydrodynamics of model-scale propellers. The literature presents some methods to correct the acquired values, such as the Glauert method, but the deduction of this method does not consider the cavitation effects. This paper aims to use CFD tools to compare and analyze the effect of different levels of blockages on the thrust, torque, hydrodynamic efficiency, and cavitation on two model-scale marine propellers. Five different blockage ratios (from 1% to 41%) and three test cases are simulated, varying the advance ratio to compose the propeller performance diagram. The simulations have shown that the Glauert formula satisfactorily corrected thrust, torque, and hydrodynamic efficiency, even in moderate cavitation. When cavitation is intense, it is observed that the blockage decreases the thrust and torque, not being recommended to use the Glauert formula. It is observed that the cavitation is sensitive to blockage, and it can affect its pattern on the blade surface.

Original language	English
Article number	103019
Number of pages	16
Journal	Applied Ocean Research
Volume	120
Early online date	11 Jan 2022
DOIs	https://doi.org/10.1016/j.apor.2021.103019
Publication status	Published - 31 Mar 2022

Funding

The authors thank Felipe Santos de Castro for the proofreading. Also, the authors thank Ricardo Sbragio and Helio Corrêa da Silva Junior for allowing the use of the propeller P107 data in this work. The first author thanks the Institute for Technological Research (IPT) and the Foundation for the Institute for Technological Research (FIPT) . The last author thanks the financial support of CNPq (National Council for Scientific and Technological Development), Brazil under grants 456359/2013-3 and 456345/2013-2 ; and the Brazilian Innovation Agency (FINEP) under grant CT-Infra-01.18.0082.00.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 14 Life Below Water

Keywords

blockage
cavitation
CFD
instrumentation
propeller

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10.1016/j.apor.2021.103019

Katsuno-Dantas-AOR-2022-Blockage-effect-influence-on-model-scale-marine-propeller-performanceAccepted author manuscript, 2.64 MBLicence: CC BY-NC-ND 4.0

Cite this

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title = "Blockage effect influence on model-scale marine propeller performance and cavitation pattern",

abstract = "The blockage effect is one of the drawbacks in the use of cavitation tunnels, which may considerably interfere in the measurements of the hydrodynamics of model-scale propellers. The literature presents some methods to correct the acquired values, such as the Glauert method, but the deduction of this method does not consider the cavitation effects. This paper aims to use CFD tools to compare and analyze the effect of different levels of blockages on the thrust, torque, hydrodynamic efficiency, and cavitation on two model-scale marine propellers. Five different blockage ratios (from 1\% to 41\%) and three test cases are simulated, varying the advance ratio to compose the propeller performance diagram. The simulations have shown that the Glauert formula satisfactorily corrected thrust, torque, and hydrodynamic efficiency, even in moderate cavitation. When cavitation is intense, it is observed that the blockage decreases the thrust and torque, not being recommended to use the Glauert formula. It is observed that the cavitation is sensitive to blockage, and it can affect its pattern on the blade surface.",

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AU - Katsuno, Eduardo Tadashi

AU - Dantas, João Lucas Dozzi

PY - 2022/3/31

Y1 - 2022/3/31

N2 - The blockage effect is one of the drawbacks in the use of cavitation tunnels, which may considerably interfere in the measurements of the hydrodynamics of model-scale propellers. The literature presents some methods to correct the acquired values, such as the Glauert method, but the deduction of this method does not consider the cavitation effects. This paper aims to use CFD tools to compare and analyze the effect of different levels of blockages on the thrust, torque, hydrodynamic efficiency, and cavitation on two model-scale marine propellers. Five different blockage ratios (from 1% to 41%) and three test cases are simulated, varying the advance ratio to compose the propeller performance diagram. The simulations have shown that the Glauert formula satisfactorily corrected thrust, torque, and hydrodynamic efficiency, even in moderate cavitation. When cavitation is intense, it is observed that the blockage decreases the thrust and torque, not being recommended to use the Glauert formula. It is observed that the cavitation is sensitive to blockage, and it can affect its pattern on the blade surface.

AB - The blockage effect is one of the drawbacks in the use of cavitation tunnels, which may considerably interfere in the measurements of the hydrodynamics of model-scale propellers. The literature presents some methods to correct the acquired values, such as the Glauert method, but the deduction of this method does not consider the cavitation effects. This paper aims to use CFD tools to compare and analyze the effect of different levels of blockages on the thrust, torque, hydrodynamic efficiency, and cavitation on two model-scale marine propellers. Five different blockage ratios (from 1% to 41%) and three test cases are simulated, varying the advance ratio to compose the propeller performance diagram. The simulations have shown that the Glauert formula satisfactorily corrected thrust, torque, and hydrodynamic efficiency, even in moderate cavitation. When cavitation is intense, it is observed that the blockage decreases the thrust and torque, not being recommended to use the Glauert formula. It is observed that the cavitation is sensitive to blockage, and it can affect its pattern on the blade surface.

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KW - cavitation

KW - CFD

KW - instrumentation

KW - propeller

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ER -

Blockage effect influence on model-scale marine propeller performance and cavitation pattern

Abstract

Funding

UN SDGs

Keywords

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