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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
Том 26, 2019 Том 25, 2018 Том 24, 2017 Том 23, 2016 Том 22, 2015 Том 21, 2014 Том 20, 2013 Том 19, 2012 Том 18, 2011 Том 17, 2010 Том 16, 2009 Том 15, 2008 Том 14, 2007 Том 13, 2006 Том 12, 2005 Том 11, 2004 Том 10, 2003 Том 9, 2002 Том 8, 2001 Том 7, 2000 Том 6, 1999 Том 5, 1998 Том 4, 1997 Том 3, 1996 Том 2, 1995 Том 1, 1993

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

Краткое описание

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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