Radiused Edge Blade Tip for a Wider Operating Range in Wells Turbine

Autor:	Abdus Samad, P. Madhan Kumar, Paresh Halder
Rok vydání:	2021
Předmět:	Multidisciplinary Materials science Turbulence 010102 general mathematics Flow (psychology) Stall (fluid mechanics) Mechanics Edge (geometry) 01 natural sciences Turbine Physics::Fluid Dynamics Annulus (firestop) Torque 0101 mathematics Wells turbine
Zdroj:	Arabian Journal for Science and Engineering. 46:2663-2676
ISSN:	2191-4281 2193-567X
DOI:	10.1007/s13369-020-05185-z
Popis:	The narrow operating range of a Wells turbine restricts its energy extraction capability from the ocean waves. In this work, the concept of a radiused edge tip blade (RETB) was introduced to overcome such an issue. The RET modifies the tip and changes the tip leakage flow behaviour. The flow through the turbine annulus was simulated numerically and compared with the existing experimental results of the reference turbine. Three-dimensional Reynolds-averaged Navier–Stokes equations with a two-equation turbulence closure model available in ANSYS CFX 14.5 was used for the simulations. The computational domain was discretized with unstructured tetrahedral elements, and the grid independence study gave an optimal grid. The RETB altered the tip leakage flow characteristics and delayed the stall inception. The RETB enhanced the relative operating range by 25% and peak torque by 37%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9637db92d7380f6a480007bf350d21da https://doi.org/10.1007/s13369-020-05185-z Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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