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Two-phase flow pattern recognition in a varying section based on void fraction and pressure measurements

François De Kerret, Inès Benito, Cédric Béguin, Dominique Pelletier et Stéphane Étienne

Communication écrite (2016)

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Abstract

In a hydroelectric turbine, the air injected during operation has an impact on the yield of the machine leading to important losses of energy. To understand those losses and be able to reduce them, a first step is to understand the pattern of the two-phase flows and describe their characteristics in the turbine. Those two-phase flows can be bubbly, intermittent, or annular, with different types of intermittent flow possible. Two-phase flow patterns are well defined in classical geometries such as cylinders with reliable descriptions available [5]. But, there is a critical lack of knowledge for flow patterns in other geometries. In our present work we take interest into a geometry that is a pipe with periodical changes of the section and realize a flow pattern map. To realize this map, we measure the pressure variations and void fraction fluctuations while changing the flow rates of water and air in our test section. We then use our physical understanding of the phenomena to analyze data and identify different flow patterns, characterize them, and build a new flow pattern map.

Département: Département de génie mécanique
Organismes subventionnaires: BWC/AECL/NSERC Industrial Research Chair in Fluid-Structure Interaction from Polytechnique Montreal, and the NSERC Individual Discovery Grant Program
URL de PolyPublie: https://publications.polymtl.ca/36651/
Nom de la conférence: 28th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2016)
Lieu de la conférence: Grenoble, France
Date(s) de la conférence: 2016-07-04 - 2016-07-08
Maison d'édition: IOP Publishing
DOI: 10.1088/1755-1315/49/5/052015
URL officielle: https://doi.org/10.1088/1755-1315/49/5/052015
Date du dépôt: 18 avr. 2023 15:05
Dernière modification: 02 oct. 2024 13:00
Citer en APA 7: De Kerret, F., Benito, I., Béguin, C., Pelletier, D., & Étienne, S. (juillet 2016). Two-phase flow pattern recognition in a varying section based on void fraction and pressure measurements [Communication écrite]. 28th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2016), Grenoble, France (10 pages). https://doi.org/10.1088/1755-1315/49/5/052015

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