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Numerical simulation of air injection in Francis turbine Full article

Conference 29th IAHR Symposium on Hydraulic Machinery and Systems
16-21 Sep 2018 , Kyoto
Journal IOP Conference Series: Earth and Environmental Science
ISSN: 1755-1307
Output data Year: 2019, Volume: 240, Number: 2, Article number : 022043, Pages count : 1 DOI: 10.1088/1755-1315/240/2/022043
Authors Chirkov D 1 , Scherbakov P 1 , Skorospelov V 2 , Cherny S 1 , Zakharov A 3
Affiliations
1 Institute of Computational Technologies SB RAS
2 Sobolev Institute of Mathematics SB RAS
3 OJSC "Power Machines" LMZ, St-Petersburg

Abstract: Operation of Francis turbines in part load and sometimes in full load operating points is associated with increased pressure pulsations. One of the practical ways to reduce these pulsations is to add atmospheric air into the flow. It was shown previously that air injection/admission through the center of the runner cone can significantly reduce the amplitude of pressure pulsations both in part load and in full load operating points. Up to now the effect of flow aeration has been investigated mainly experimentally. In the present paper we performed CFD simulations of this phenomenon. Computations have been carried out in frames of homogeneous three-phase “liquid – vapor – non-condensable gas” mixture model. Air phase has been assumed incompressible. Both part load and full load operating points have been considered with different air flow rates. Computations have shown that even at small flow rate the air changes the structure of the swirling flow downstream the runner and considerably reduces pressure pulsations, caused by vortex rope rotation. The obtained results are in agreement with corresponding experimental data for model turbine.
Cite: Chirkov D. , Scherbakov P. , Skorospelov V. , Cherny S. , Zakharov A.
Numerical simulation of air injection in Francis turbine
IOP Conference Series: Earth and Environmental Science. 2019. V.240. N2. 022043 :1-1. DOI: 10.1088/1755-1315/240/2/022043 Scopus OpenAlex
Identifiers:
Scopus: 2-s2.0-85063889149
OpenAlex: W2925686925
Citing:
DB Citing
Scopus 12
OpenAlex 10
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