Numerical simulation of air injection in Francis turbine Full article
Conference |
29th IAHR Symposium on Hydraulic Machinery and Systems 16-21 Sep 2018 , Kyoto |
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Journal |
IOP Conference Series: Earth and Environmental Science
ISSN: 1755-1307 |
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Output data | Year: 2019, Volume: 240, Number: 2, Article number : 022043, Pages count : 1 DOI: 10.1088/1755-1315/240/2/022043 | ||||||
Authors |
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Affiliations |
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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
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 |