Numerical simulation of air injection in part load operating point Full article
Conference |
30th IAHR Symposium on Hydraulic Machinery and Systems 21-26 Mar 2021 , Lausanne |
||||
---|---|---|---|---|---|
Source | IOP Conference Series. Earth and Enviromental Science Compilation, 2021. |
||||
Output data | Year: 2021, Volume: 774, Number: 1, Pages: Article number 012104 Pages count : DOI: 10.1088/1755-1315/774/1/012104 | ||||
Authors |
|
||||
Affiliations |
|
Abstract:
The operation hydro turbines in the off-design operating points is often accompanied
by pressure pulsations with a large amplitude. One way to deal with such pulsations is to inject
the air into hydro turbine flow passage. The aim of this work is to simulate this process.
Previously we carried out calculations in frames of homogeneous incompressible three-phase
«liquid – vapor – non-condensable gas» mixture model. The computational domain consisted of
wicket gate, runner and draft tube. The wicket gate and runner were considered in the periodic
stage approach. The results obtained were in good agreement with experimental data at full load
operating point. It was shown that the calculations on the previous model failed to accurately
simulate influence of air flow rate on the amplitude and frequency of pressure pulsations in part
load. Therefore the part load regime is studied carefully in this work: different computational
domains are considered, different solvers are used, including ANSYS CFX and CADRUN,
developed at the Institute of Computational Technologies. Different models of «liquid – gas»
mixture are used in the calculations, compressibility is also taken into account. The flow rate of
the injected air ranged from 0.5 to 2 percent of the water flow rate. The influence of the injected
air on the flow pattern, including the vortex rope, is investigated. The results obtained are
compared with experimental data.
Cite:
Shcherbakov P.
, Chirkov D.
, Skorospelov V.
, Turuk P.
Numerical simulation of air injection in part load operating point
In compilation IOP Conference Series. Earth and Enviromental Science. 2021. – Т.774. – C.Article number 012104. DOI: 10.1088/1755-1315/774/1/012104 Scopus OpenAlex
Numerical simulation of air injection in part load operating point
In compilation IOP Conference Series. Earth and Enviromental Science. 2021. – Т.774. – C.Article number 012104. DOI: 10.1088/1755-1315/774/1/012104 Scopus OpenAlex
Identifiers:
Scopus: | 2-s2.0-85108631479 |
OpenAlex: | W3170160227 |