scholarly journals Experimental investigation of added mass effects on a Francis turbine runner in still water

2006 ◽  
Vol 22 (5) ◽  
pp. 699-712 ◽  
Author(s):  
C.G. Rodriguez ◽  
E. Egusquiza ◽  
X. Escaler ◽  
Q.W. Liang ◽  
F. Avellan
Keyword(s):  
Experimental Investigation ◽  
Added Mass ◽  
Francis Turbine ◽  
Mass Effects ◽  
Turbine Runner

scholarly journals Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Fluids ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 107
Author(s):  
Xingxing Huang ◽  
Xavier Escaler
Keyword(s):  
Large Scale ◽  
Pure Water ◽  
Leading Edge ◽  
Added Mass ◽  
Francis Turbine ◽  
Surrounding Water ◽  
Mass Effects ◽  
Turbine Runner ◽  
Level Of Significance ◽  
Interaction Problem

To have a safe structural design, an analysis of the dynamic behavior of a Francis turbine runner with consideration of the added mass effects of surrounding water is necessary during design phase. Both in design and at off-design operations, large-scale forms of attached cavitation may appear on runner blades and can change the added mass effects of the surrounding fluid in relation to a single water domain. Consequently, a numerical investigation of the modal response of a Francis runner has been carried out by reproducing the presence of various sizes of leading edge cavitation (LEC) and trailing edge cavitation (TEC). The fluid–structure interaction problem has been solved by means of an acoustic-structural coupling method. The calculated added mass effects with cavitation have been compared with those corresponding to the pure water condition without cavitation. Firstly, a single blade has been investigated to evaluate the level of significance for the proposed cavity shapes and dimensions. Afterwards, based on the results obtained, the complete runner structure has been considered, factoring in similar cavity shapes and locations. The results prove that significant added mass effects are induced on the entire runner by the attached cavitation that increase the natural frequencies of the first modes. Moreover, the added mass effects increase with cavity size and amplitude of blade deformation below the cavity.

Numerical simulation of fluid added mass effect on a francis turbine runner

2007 ◽  
Vol 36 (6) ◽  
pp. 1106-1118 ◽  
Author(s):  
Q.W. Liang ◽  
C.G. Rodríguez ◽  
E. Egusquiza ◽  
X. Escaler ◽  
M. Farhat ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Mass Effect ◽  
Added Mass ◽  
Francis Turbine ◽  
Turbine Runner ◽  
Fluid Added Mass

scholarly journals Experimental investigation of added mass effects on a hydrofoil under cavitation conditions

2013 ◽  
Vol 39 ◽  
pp. 173-187 ◽  
Author(s):  
O. De La Torre ◽  
X. Escaler ◽  
E. Egusquiza ◽  
M. Farhat
Keyword(s):  
Experimental Investigation ◽  
Added Mass ◽  
Mass Effects

The Strength Analysis of Francis Turbine Runner Based on the Fluid-Solid Coupling

2014 ◽  
Vol 709 ◽  
pp. 41-45
Author(s):  
Kan Kan ◽  
Yuan Zheng ◽  
Xin Zhang ◽  
Bin Sun ◽  
Hui Wen Liu
Keyword(s):  
Water Pressure ◽  
Eastern China ◽  
Static Stress ◽  
Operating Conditions ◽  
Francis Turbine ◽  
Strength Analysis ◽  
Maximum Deformation ◽  
The North ◽  
North Eastern ◽  
Turbine Runner

This paper does unidirectional fluid-solid coupling calculation on the runner strength under three designed head loading conditions of a certain Francis turbine in the north-eastern China. The water pressure on the blade in the flow fields of different operating conditions is calculated by means of CFD software CFX. With the help of ansys workbench, the water pressure is loaded to the blade as structural load to conclude the static stress distribution and deformation of the runner under different operating conditions. The results show that the maximum static stress increases with the rise of the flow and appears near the influent side of the blade connected to the runner crown; the maximum deformation increases with the rise of the flow and appears on the band. The results provides effective basis for the structural design and safe operation of the Francis turbine.

Two Phase PIV Measurements at the Runner Outlet in a Francis Turbine

2003 ◽  
Author(s):  
Monica Sanda Iliescu ◽  
Gabriel Dan Ciocan ◽  
Franc¸ois Avellan
Keyword(s):  
Francis Turbine ◽  
Cavitation Flow ◽  
Two Phase ◽  
Piv Measurements ◽  
Turbine Runner ◽  
Physical Insight ◽  
Complex Phenomena ◽  
Hydro Turbines ◽  
Operating Regimes ◽  
Averaging Techniques

Part load operation of hydro turbines with fixed pitch blades causes complex instable cavitation flow in the diffuser cone. Application of PIV systems provides the opportunity to investigate the flow velocity and turbulent fields in the case of development of cavitation vortex, the so-called turbine rope, at the outlet of a Francis turbine runner. The synchronization of the PIV flow survey with the rope precession allows to apply phase averaging techniques in order to extract both the periodic velocity components and the rope layout. The influence of the turbine setting level on the volume of the cavity rope and its center is investigated, providing a physical insight on the hydrodynamic complex phenomena involved in the development of the cavitation rope at Francis turbine operating regimes.

Fluid Force Moment on the Backshroud of a Francis Turbine Runner in Precession Motion

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Bingwei Song ◽  
Hironori Horiguchi ◽  
Yumeto Nishiyama ◽  
Shinichiro Hata ◽  
Zhenyue Ma ◽  
...  
Keyword(s):  
Flow Model ◽  
Swirl Flow ◽  
Francis Turbine ◽  
Leakage Flow ◽  
Fluid Force ◽  
Disk Rotation ◽  
Leakage Flow Rate ◽  
Turbine Runner ◽  
Force Moment ◽  
Axial Clearance

The fundamental characteristics of rotordynamic fluid force moment on the backshroud of a Francis turbine runner in precession motion were studied using model tests and computations based on a bulk flow model. The runner is modeled by a disk positioned close to a casing with a small axial clearance. An inward leakage flow is produced by an external pump in the model test. The effects of the leakage flow rate, the preswirl velocity at the inlet of the clearance, and the axial clearance on the fluid force moment were examined. It was found that the fluid force moment encourages the precession motion at small forward precession angular velocity ratios and the region encouraging the precession motion is affected by the preswirl velocity. Through the comparisons of the fluid force moment with and without the rotation of the disk, it was found that the normal moment without the disk rotation did not have the effect to encourage the precession motion. Thus, the swirl flow due to disk rotation was found to be responsible for the encouragement of the precession motion.

Experimental investigation for R&D in sediment laden pico hydraulic francis turbine

2020 ◽  
Vol 155 ◽  
pp. 889-898 ◽  
Author(s):  
Atmaram Kayastha ◽  
Biraj Singh Thapa ◽  
Bhola Thapa ◽  
Young Ho Lee
Keyword(s):  
Experimental Investigation ◽  
Francis Turbine
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