A New Systematic Series of Foil Sections with Parallel Sides
| Autor: | Lars Larsson, Adam Persson, Antonio Mancuso, Antonio Saporito |
|---|---|
| Přispěvatelé: | Saporito A, Persson A, Larsson A, Mancuso A |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Flow (psychology)
low Reynolds number Ocean Engineering Geometry 02 engineering and technology 01 natural sciences Bézier curves 010305 fluids & plasmas centerboard lcsh:Oceanography symbols.namesake gamma transition criterion lcsh:VM1-989 parallel-sided 0103 physical sciences Fluid dynamics sailing Trailing edge CAD lcsh:GC1-1581 Settore ING-IND/15 - Disegno E Metodi Dell'Ingegneria Industriale Water Science and Technology Civil and Structural Engineering Mathematics Bézier curve Series (mathematics) Turbulence lcsh:Naval architecture. Shipbuilding. Marine engineering Reynolds number Radius Rudder 021001 nanoscience & nanotechnology NACA systematic investigation symbols 0210 nano-technology |
| Zdroj: | Journal of Marine Science and Engineering Volume 8 Issue 9 Journal of Marine Science and Engineering, Vol 8, Iss 677, p 677 (2020) |
| ISSN: | 2077-1312 |
| DOI: | 10.3390/jmse8090677 |
| Popis: | 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&ndash Stokes solver is used with the k-&omega 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 Bé zier 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. |
| Databáze: | OpenAIRE |
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