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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2014006575
pages 309-321

FLOW VISUALIZATION APPROACH FOR PERIODICALLY REVERSED FLOWS

Francisco Botero
Department of Mechanical Engineering, Universidad EAFIT, Cr 49 No 7 sur 50, Medellin, Colombia
Sebastian Guzman
Department of Mechanical Engineering, Universidad EAFIT, Cr 49 No 7 sur 50, Medellin, Colombia
Vlad Hasmatuchi
Laboratory for Hydraulic Machines, Ecole Polytechnique Federale de Lausanne, Avenue de Cour 33 bis, CH-1007 Lausanne, Switzerland
Steven Roth
Laboratory for Hydraulic Machines, Ecole Polytechnique Federale de Lausanne, Avenue de Cour 33 bis, CH-1007 Lausanne, Switzerland
Mohamed Farhat
Laboratory for Hydraulic Machines, Ecole Polytechnique Federale de Lausanne, Avenue de Cour 33 bis, CH-1007 Lausanne, Switzerland

ABSTRACT

An unconventional tuft visualization method, along with an image processing technique adapted to the flow conditions, is proposed and implemented on a reduced-scale model of a Francis-type reversible pump-turbine in three different turbine stages such as turbine mode, runaway mode, and turbine break mode. The main goal of this technique is to visualize the complex flow developed during a rotating stall phenomenon. Fluorescent monofilament wires along with high-speed image processing and pressure sensors were installed in the narrow and vaneless gap between the impeller blades and guide vanes. Pressure fluctuations were analyzed along with tuft visualization to describe the flow with and without a rotating stall. The implemented tuft visualization method gives an adjusted qualitative description of the undergoing phenomena, making different flow behaviors such as backflow, high turbulences, recirculation, etc., evident.


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