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Boundary layer effects on the vortex shedding in a Donaldsontype hydrofoil

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Fontanals García, AlfredMés informacióMés informacióMés informació
Guardo Zabaleta, Alfredo de JesúsMés informacióMés informacióMés informació
Zobeiri, Amirreza
Egusquiza Estévez, EduardMés informacióMés informació
Farhat, Mohamed
Avellan, François
Document typeConference lecture
Defense date2014
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Fluid - Structure Interaction (FSI) phenomena is becoming a relevant study field for the design or revamping of hydropower plants. The generalized trend of increasing flow rates and reducing rotor blades/stay vanes thickness in order to improve the efficiency of the machine together with a major push from plant owners/operators for production flexibility (partial load operation is more common nowadays) make the FSI between the vortex shedding phenomenon and the vanes/blades of the machine an area of interest. From a design point of view, the machine structure has to resist all the hydrodynamic forces generated and maintain tension stresses under the fatigue limit to ensure a machine lifetime of several decades. To accomplish that goal, designers have to assure there is no presence of strong coupling phenomena (lock-in) between the vortex shedding frequency and the eigenfrequencies of the structure. As the vortex street is directly related to the state of the boundary layer along the hydrofoil, in this paper the effect of the boundary layer on the vortex shedding in a Donaldson-type hydrofoil is studied using Computational Fluid Dynamics (CFD). The development of the boundary layer along the Donaldson trailing edge hydrofoil chord is presented under lock-off conditions. The results are validated against previously obtained experimental results. Since the Donaldson trailing edge is non-symmetric, the boundary layer velocity profiles are reported for the suction and pressure side of the hydrofoil. In addition, the effect of the Donaldson trailing edge on laminar-to-turbulent transition on both sides of the hydrofoil is studied.
CitationFontanals, A. [et al.]. Boundary layer effects on the vortex shedding in a Donaldsontype hydrofoil. A: IAHR Symposium on Hydraulic Machinery and Systems. "Proceedings of the 27th IAHR Symposium on Hydraulic Machinery and Systems". Montreal: 2014. 
URIhttp://hdl.handle.net/2117/24974
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  • Departament de Mecànica de Fluids - Ponències/Comunicacions de congressos [180]
  • FLUIDS - Enginyeria de Fluids - Ponències/Comunicacions de congressos [46]
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