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J. Mar. Sci. Eng. 2018, 6(2), 60; https://doi.org/10.3390/jmse6020060

The Effect of Propeller Scaling Methodology on the Performance Prediction

1
Stone Marine Propulsion Ltd., SMM Business Park, Dock Rd, Birkenhead CH41 1DT, UK
2
Hamburgische Schiffbau-Versuchsanstalt GmbH, Bramfelder Straße 164, 22305 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Received: 28 February 2018 / Revised: 27 April 2018 / Accepted: 4 May 2018 / Published: 24 May 2018
(This article belongs to the Special Issue Marine Propulsors)
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Abstract

In common model testing practise, the measured values of the self propulsion test are split into the characteristics of the hull, the propeller and into the interaction factors. These coefficients are scaled separately to the respective full scale values and subsequently reassembled to give the power prediction. The accuracy of this power prediction depends inter alia on the accuracy of the measured values and the scaling procedure. An inherent problem of this approach is that it is virtually impossible to verify each single step, because of the complex nature of the underlying problem. In recent years the scaling of the open-water characteristics of propeller model tests attracted a renewed interest, fuelled by competitive tests, which became the norm due to requests of the customer. This paper shows the influence of different scaling procedures on the predicted power. The prediction is compared to the measured trials data and the quality of the prediction is judged. The procedures examined are the standard ITTC 1978 procedure plus derivatives of it, the Meyne method, the strip method developed by the Hamburgische Schiffbau-Versuchsanstalt (HSVA) and the β i -method by Helma. View Full-Text
Keywords: propeller scale effects; propeller open-water efficiency; surface roughness; equivalent profile; strip method; βi-method propeller scale effects; propeller open-water efficiency; surface roughness; equivalent profile; strip method; βi-method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Helma, S.; Streckwall, H.; Richter, J. The Effect of Propeller Scaling Methodology on the Performance Prediction. J. Mar. Sci. Eng. 2018, 6, 60.

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