Article
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Preserved in Portico This version is not peer-reviewed
Surprising Behaviour of the Wageningen B-screw Series Polynomials
Version 1
: Received: 9 December 2019 / Approved: 10 December 2019 / Online: 10 December 2019 (15:57:55 CET)
Version 2 : Received: 29 January 2020 / Approved: 30 January 2020 / Online: 30 January 2020 (10:59:59 CET)
Version 2 : Received: 29 January 2020 / Approved: 30 January 2020 / Online: 30 January 2020 (10:59:59 CET)
A peer-reviewed article of this Preprint also exists.
Helma, S. Surprising Behaviour of the Wageningen B-Screw Series Polynomials. J. Mar. Sci. Eng. 2020, 8, 211. Helma, S. Surprising Behaviour of the Wageningen B-Screw Series Polynomials. J. Mar. Sci. Eng. 2020, 8, 211.
Abstract
Undoubtedly the Wageningen B-screw Series is the most widely used systematic propeller series. It is very popular to preselect propeller dimensions during the preliminary design stage before performing a more thorough optimization, but in the smaller end of the market it is often used to merely select the final propeller. Over time the originally measured data sets were faired and scaled to a uniform Reynolds number of 2·106 to increase the reliability of the series. With the advent of the computer, polynomials for the thrust and torque values were calculated based on the available data sets. The measured data are typically presented in the well-known open-water curves of thrust and torque coefficients KT and KQ versus the advance coefficient J. Changing the presentation from these diagrams to efficiency maps reveals some unsuspected and surprising behaviours, such as multiple optima when optimizing for efficiency or even no optimum at all for certain conditions. These artefacts get more pronounced at higher pitch to diameter ratios and low blade numbers. The present work builds upon the paper presented by the author at the AMT’17 and smp’19 conferences and now includes the extended efficiency maps, as suggested by Danckwardt, for all propellers of the Wageningen B-screw Series.
Keywords
propeller; wageningen b-screw series; open-water characteristics; propeller efficiency map; danckwardt diagram; optimum propeller
Subject
Engineering, Marine Engineering
Copyright: 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.
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