A characterization procedure for the dynamic behavior of Francis turbines : Practical comparison of elbow and Moody type draft tubes

Characterization from model tests of the dynamic behavior of hydraulic turbines operating off design conditions is an important step in the knowledge of instability phenomena. IMHEF at EPF-Lausanne, Switzerland meets this purpose with a standard test procedure . Simple , fast and efficient, it yields complete and easily interpreted results. This test procedure is used here to compare the dynamic characteristics of elbow and Moody type draft tubes . Relevant frequencies and cavitation compliance are expressed as functions of the machine flow rate. The runner design has a dominant influence on the occurrence of part - load resonance on the tested model. Modifications of dynamic phenomena by an internal structure of the draft tube are shown. The need for generalization of such tests appears clearly from these results.


Published in:
Proceedings of the 14th IAHR Symposium on Progress within large and high specific energy units, 1, F5, 391-402
Presented at:
section on hydraulic machinery and cavitation : Trondheim, Norway, 20-23 June
14th IAHR Symposium on Progress within large and high specific energy units, Trondheim, Norway, June 20-23, 1988
Year:
1988
Publisher:
International Association For Hydraulic Research
Note:
Using Smart Source Parsing 20-23 June pp 3
Laboratories:




 Record created 2005-11-04, last modified 2018-04-24

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