A scaling procedure for modern propeller designs
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/332588
Tipus de documentText en actes de congrés
Data publicació2015
EditorCIMNE
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
The extrapolation procedures currently used to scale propeller characteristics tested at
model scale to their full scale performances are either based on a statistical [1], the Lerbs-
Meyne [2] or the recently developed strip method [3].
With the emergence of so-called unconventional propellers and different design strategies
associated with them, it has been questioned whether the assumptions used in these scaling methods
are still universally valid. E.g. with tip and root unloading employed, the circulation
distribution deviates from the optimum, which is assumed by the Lerbs-Meyne method; more modern
profiles show a different camber distribution and hence the drag coefficient must be aligned with
the hydrodynamic inflow angle and not with the pitch to diameter ratio as assumed by the strip
method (and implicitly by the ITTC 1978 method [4]).
The work presented still uses the assumption of the equivalent profile and will
explain a modified scaling procedure showing a way to calculate the hydrodynamic inflow angle
solely from one open-water test conducted at a constant Reynolds number. Finally exemplary results
comparing a propeller of conventional type with a recent propeller designs will also be shown.
The new proposed method shows a superior performance when compared to other scaling
methods.
CitacióHelma, S. A scaling procedure for modern propeller designs. A: MARINE VI. "MARINE VI : proceedings of the VI International Conference on Computational Methods in Marine Engineering". CIMNE, 2015, p. 1051-1063. ISBN 978-84-943928-6-3.
ISBN978-84-943928-6-3
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
Marine-2015-86_A SCALING PROCEDURE FOR MODERN.pdf | 591,7Kb | Visualitza/Obre |