Experimental investigation on the effect off near walls on the eigen frequency of a low specific speed francis runner

•Modal test of low specific speed Francis Runner.•Three different environments; air, water and water filled turbine housing.•Traveling wave excitation to differentiate mode shapes and nodal diameters.•40% frequency reduction of main modes in water.•Installed into turbine housing changes damping more...

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Published in:	Mechanical systems and signal processing Vol. 118; pp. 757 - 766
Main Authors:	Østby, Petter T.K., Sivertsen, Kjell, Billdal, Jan Tore, Haugen, Bjørn
Format:	Journal Article
Language:	English
Published:	Berlin Elsevier Ltd 01-03-2019 Elsevier BV
Subjects:	Added mass Eigenvalues Fluid dynamics Fluid-structure interaction Francis runner Housing Microelectromechanical systems Modal testing Nearby walls Number theory Resonant frequencies Turbines Walls Water tanks Modal testing Added mass Francis runner Nearby walls Fluid-structure interaction
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Abstract	•Modal test of low specific speed Francis Runner.•Three different environments; air, water and water filled turbine housing.•Traveling wave excitation to differentiate mode shapes and nodal diameters.•40% frequency reduction of main modes in water.•Installed into turbine housing changes damping more than eigen frequencies. The importance to correctly predict the natural frequency of a turbine runner have been demonstrated several times. It is now common practice to include the added mass effect of the surrounding water when calculating the natural frequencies. In this paper the added mass effect of water on a simplified low specific speed francis turbine runner is experimentally investigated. Three cases are investigated. 1: The runner hanging in air. 2: The runner hanging in a tank of water. 3: The runner installed into the turbine housing. The measurements reveal a frequency reduction of about 40% when the runner is hanging in water. Installing the runner into the turbine housing does not significantly change the natural frequency of the main blade modes. Modes which vibrate heavily on the outside of the runner are visible in the water tank but becomes dampened when installed into the turbine housing.
AbstractList	•Modal test of low specific speed Francis Runner.•Three different environments; air, water and water filled turbine housing.•Traveling wave excitation to differentiate mode shapes and nodal diameters.•40% frequency reduction of main modes in water.•Installed into turbine housing changes damping more than eigen frequencies. The importance to correctly predict the natural frequency of a turbine runner have been demonstrated several times. It is now common practice to include the added mass effect of the surrounding water when calculating the natural frequencies. In this paper the added mass effect of water on a simplified low specific speed francis turbine runner is experimentally investigated. Three cases are investigated. 1: The runner hanging in air. 2: The runner hanging in a tank of water. 3: The runner installed into the turbine housing. The measurements reveal a frequency reduction of about 40% when the runner is hanging in water. Installing the runner into the turbine housing does not significantly change the natural frequency of the main blade modes. Modes which vibrate heavily on the outside of the runner are visible in the water tank but becomes dampened when installed into the turbine housing. The importance to correctly predict the natural frequency of a turbine runner have been demonstrated several times. It is now common practice to include the added mass effect of the surrounding water when calculating the natural frequencies. In this paper the added mass effect of water on a simplified low specific speed francis turbine runner is experimentally investigated. Three cases are investigated. 1: The runner hanging in air. 2: The runner hanging in a tank of water. 3: The runner installed into the turbine housing. The measurements reveal a frequency reduction of about 40% when the runner is hanging in water. Installing the runner into the turbine housing does not significantly change the natural frequency of the main blade modes. Modes which vibrate heavily on the outside of the runner are visible in the water tank but becomes dampened when installed into the turbine housing.
Author	Billdal, Jan Tore Østby, Petter T.K. Haugen, Bjørn Sivertsen, Kjell
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Cites_doi	10.1016/j.compfluid.2012.05.011 10.1016/j.engfailanal.2017.02.021 10.1115/1.3428107 10.1115/DETC2009-86830 10.1016/j.jfluidstructs.2017.05.008 10.1016/j.jfluidstructs.2014.09.003 10.1088/1755-1315/49/7/072004 10.1002/nme.1620140107 10.3390/ecsa-3-E010 10.1088/0964-1726/21/3/035027 10.1016/j.rser.2016.09.121 10.1088/1755-1315/22/3/032052 10.5293/IJFMS.2018.11.2.146 10.1088/1757-899X/52/2/022036 10.1016/j.jfluidstructs.2006.04.001 10.1115/DETC2003/VIB-48448 10.1016/j.ymssp.2004.01.003
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Snippet	•Modal test of low specific speed Francis Runner.•Three different environments; air, water and water filled turbine housing.•Traveling wave excitation to... The importance to correctly predict the natural frequency of a turbine runner have been demonstrated several times. It is now common practice to include the...
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SubjectTerms	Added mass Eigenvalues Fluid dynamics Fluid-structure interaction Francis runner Housing Microelectromechanical systems Modal testing Nearby walls Number theory Resonant frequencies Turbines Walls Water tanks
Title	Experimental investigation on the effect off near walls on the eigen frequency of a low specific speed francis runner
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