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Article

Surprising Behaviour of the Wageningen B-Screw Series Polynomials

Stone Marine Propulsion (SMP) Ltd., SMM Business Park, Dock Road CH41 1DT, UK
J. Mar. Sci. Eng. 2020, 8(3), 211; https://doi.org/10.3390/jmse8030211
Received: 9 December 2019 / Revised: 31 January 2020 / Accepted: 2 February 2020 / Published: 18 March 2020
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 optimisation, 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 K T and K Q versus the advance coefficient J . Changing the presentation from these diagrams to efficiency maps reveals some unsuspected and surprising behaviours, such as multiple extrema when optimising for efficiency or even no optimum at all for certain conditions, where an optimum could be expected. 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. View Full-Text
Keywords: propeller; Wageningen B-screw Series; open-water characteristics; propeller efficiency map; Danckwardt diagram; optimum propeller propeller; Wageningen B-screw Series; open-water characteristics; propeller efficiency map; Danckwardt diagram; optimum propeller
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MDPI and ACS Style

Helma, S. Surprising Behaviour of the Wageningen B-Screw Series Polynomials. J. Mar. Sci. Eng. 2020, 8, 211. https://doi.org/10.3390/jmse8030211

AMA Style

Helma S. Surprising Behaviour of the Wageningen B-Screw Series Polynomials. Journal of Marine Science and Engineering. 2020; 8(3):211. https://doi.org/10.3390/jmse8030211

Chicago/Turabian Style

Helma, Stephan. 2020. "Surprising Behaviour of the Wageningen B-Screw Series Polynomials" Journal of Marine Science and Engineering 8, no. 3: 211. https://doi.org/10.3390/jmse8030211

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