TY - JOUR
T1 - Fluid exciting force due to flutter and rotor-stator interactions in axial flow turbines
AU - Ajiro, K.
AU - Matsuda, K.
AU - Onishi, K.
AU - Mineshima, T.
AU - Miyagawa, K.
N1 - Funding Information:
[1] The authors would like to thank the WISE (Waseda Research Institute for Science and Engineering) for providing support to the presented research, in context of the project: 'High performance and high reliability research for hydraulic turbomachinery systems'. [2] This work was done as part of the project financially supported by the NEDO (New Energy and Industrial Technology Development Organization). We would like to thank the organizers of this work.
Publisher Copyright:
© 2019 Published under licence by IOP Publishing Ltd.
PY - 2019/3/28
Y1 - 2019/3/28
N2 - In recent years, the size and the speed of axial flow type hydraulic turbines have been continuously increased, leading to an increase of the fluid exciting forces due to rotor-stator interactions in hydraulic machines featuring both rotor and stator. In addition, the use of composite material for the blades of large hydraulic machines is increasingly investigated. Such flexible and lightweight hydrofoils can however easily experience self-excited vibration such as flutter effect. Fluid exciting forces generated in hydraulic machines might cause resonance, fatigue of the blade and finally damage. This paper aims to evaluate fluid exciting forces produced by rotor-stator interactions in axial flow turbines and the hydro-elastic response to the flutter of a flexible hydrofoil. To evaluate fluid exciting forces due to rotor-stator interactions, experiments are carried out using a closed-loop water channel featuring an axial flow turbine. The pressure distribution on the blade surface and the influence of axial distance between rotor and stator on the pressure fluctuations amplitude on the blade surface are investigated. A good agreement between experimental and numerical values is found. Regarding the flutter effect, FSI (Fluid Structure Interaction) simulation of one hydrofoil coupling RANS (Reynolds-averaged Navier-Stokes equations) and FEM (Finite Element Method) simulation is carried out to study the three-dimensional behaviour of the flutter.
AB - In recent years, the size and the speed of axial flow type hydraulic turbines have been continuously increased, leading to an increase of the fluid exciting forces due to rotor-stator interactions in hydraulic machines featuring both rotor and stator. In addition, the use of composite material for the blades of large hydraulic machines is increasingly investigated. Such flexible and lightweight hydrofoils can however easily experience self-excited vibration such as flutter effect. Fluid exciting forces generated in hydraulic machines might cause resonance, fatigue of the blade and finally damage. This paper aims to evaluate fluid exciting forces produced by rotor-stator interactions in axial flow turbines and the hydro-elastic response to the flutter of a flexible hydrofoil. To evaluate fluid exciting forces due to rotor-stator interactions, experiments are carried out using a closed-loop water channel featuring an axial flow turbine. The pressure distribution on the blade surface and the influence of axial distance between rotor and stator on the pressure fluctuations amplitude on the blade surface are investigated. A good agreement between experimental and numerical values is found. Regarding the flutter effect, FSI (Fluid Structure Interaction) simulation of one hydrofoil coupling RANS (Reynolds-averaged Navier-Stokes equations) and FEM (Finite Element Method) simulation is carried out to study the three-dimensional behaviour of the flutter.
KW - axial flow turbine
KW - blades interactions
KW - fluid exciting force
KW - flutter
KW - hydrofoil
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U2 - 10.1088/1755-1315/240/2/022061
DO - 10.1088/1755-1315/240/2/022061
M3 - Conference article
AN - SCOPUS:85063898443
SN - 1755-1307
VL - 240
JO - IOP Conference Series: Earth and Environmental Science
JF - IOP Conference Series: Earth and Environmental Science
IS - 2
M1 - 022061
T2 - 29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018
Y2 - 16 September 2018 through 21 September 2018
ER -