Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Influence factors in the performance in a tracing of a Friendly Fish Turbine hydraulic channel
Submission Author:
GERMÁN ENRIQUE NIÑO DEL RÍO , MG , Brazil
Co-Authors:
GERMÁN ENRIQUE NIÑO DEL RÍO, Ramiro Gustavo Ramirez Camacho, Tania Marie Arispe Angulo, Waldir de Oliveira
Presenter: GERMÁN ENRIQUE NIÑO DEL RÍO
doi://10.26678/ABCM.COBEM2017.COB17-0788
Abstract
This research study is based in a development of a design methodology for tracing the geometry of hydraulic channel for a friendly-fish turbine. The hydrodynamic performance characteristics are obtained, through CFD techniques, considering the operating conditions and geometrical factors that may influences significantly in the efficiency and rotor performance. For the analysis of the hydrodynamic performance of the turbine, criteria such as turbine drowning levels, angular velocity, and the use of two types of draft tubes and their influence on the performance of the turbine; were considered. The types of draft tubes considered are a simple conical draft tube and the parameterized draft tube, based on the original geometry of the GAMM Francis Turbine. The GAMM (Gesellschaft für Angewandte Mathematik und Mechanik - Mathematical and Mechanics Applied Society) Francis turbine is a normal Francis turbine model that was tested in the Hydraulic Machines Laboratory IMH-EPFL in Lausanne, Switzerland. The elbow draft tube modified over the original geometry draft tube of the GAMM Francis turbine, has the characteristic that the generatrix line that defines its contour in the plane, is a curve in hyperbolic spiral format, denominated in the current paper as HIP-DT. In the HIP-DT draft tube, at the outlet and at the inlet of the cone and the diffuser respectively, the curvature is zero, thus allowing the transition of the draft tube geometry from the cone to the diffuser to be smooth, this allows a better hydrodynamic performance of the flow in the draft tube, and consequently in the turbine.
Keywords
Fish Friendly Turbine, NqA, Logarithmic-Spiral, Drowning turbine, Draft Tube, Hyperbolic-spiral
