Surging of 140 MW Francis turbines at high load, analysis and solution

High load surging is a specially delicate side of Francis turbines' dynamic behavior. There is yet no sure method to predict the occurrence of pulsations on a full-size machine, either from model test results or theoretical analysis. Upon commissioning of the Saucelle-Huebra power plant, high load surging made it impossible to operate in the maximum power output range. The turbine designer brought the oscillations to an acceptable level by a modification of the runner cone, without air admission. Thorough lab testing on a scale model allowed a better understanding of the problem. Influences of the runner cone, test head and tailrace tunnels are highlighted. A modal analysis using the cavitation compliance evaluated from model tests provides an explanation for the surge in the plant.


Published in:
Proceedings of the16th IAHR Symposium, section on hydraulic machinery and cavitation : Large and medium size hydraulic machinery and installations from planning to operation, Sao Paolo, Brésil, 14th to 18th September, 1, 15, 151-160
Presented at:
16th IAHR Symposium, Section on hydraulic machinery and cavitation : Large and medium size hydraulic machinery and installations from planning to operation, Sao Paolo, Brazil, September 14-18,1992
Year:
1992
Publisher:
International Association For Hydraulic Research
Note:
Using Smart Source Parsing 3
Laboratories:




 Record created 2005-11-04, last modified 2018-08-14

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)