A New Systematic Series of Foil Sections with Parallel Sides
Artikel i vetenskaplig tidskrift, 2020

Parallel-sided foil sections are used for centerboards and rudders in sailing dinghy classes and also for struts placed in a fluid flow. The objective of this work is to create a systematic series of parallel-sided sections to be used under different conditions, with an emphasis on the sailing dinghies 470, 420 and Optimist. The loss, and surprisingly the gain, in performance relative to 4-digit NACA sections are also investigated. A 2D Reynolds-averaged Navier–Stokes solver is used with the k-! SST turbulence model and the gamma transition criterion. A verification study is carried out based on four grids of systematically varied density, and results compared with experimental data on a NACA 64-006 section. The parallel-sided sections are modeled with rational Bézier curves whose geometrical parameters permit to link the shape of the profile to physical variables, which are systematically varied. Three Reynolds numbers and two angles of attack are investigated. Systematic plots show the influence of the trailing edge angle and nose radius for the different section families, and the optimum combination is presented in a table. Physical explanations of the trends, and of the exceptions, are given in the paper, using flow visualizations as well as pressure and friction plots.

low Reynolds number

centerboard

NACA

sailing

parallel-sided

gamma transition criterion

systematic investigation

CAD

Bézier curves

Författare

Antonio Saporito

Universita degli Studi di Palermo

Adam Persson

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

SSPA Sweden AB

Lars Larsson

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Antonio Mancuso

Universita degli Studi di Palermo

Journal of Marine Science and Engineering

2077-1312 (ISSN)

Vol. 8 9 677

Ämneskategorier

Maskinteknik

Strömningsmekanik och akustik

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Hälsa och teknik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.3390/jmse8090677

Mer information

Senast uppdaterat

2020-10-27