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Licentiate thesis on fluid-rotor interaction

Published: 29 September 2010

How the flowing water in a turbine influence rotor vibrations is the subject of Ida Janssons licentiate thesis. She has combined one experimental and theoretical approach to study both the unsteady force and the motion-induced reaction force the fluid imparts to the runner. An accurate turbine model of rotor models is of crucial importance both in new design and during operation of hydraulic turbines.

Nevertheless, in a wider perspective, the problem is applicable to all kinds of fluid-handling rotating energy converting devices. Ida concludes that

“The knowledge of this field must be reinforced to bring forward new design of energy converters in a development towards a sustainable society“. A part of her work was conducted at the old power station in Porjus along Lule river where she instrumented one of the blades of the runner with pressure sensors. The theoretical analysis is an attempt to bring forward classical analytical methods by choosing a simple fluid-rotor model to study the effect of fluid inertia and swirl of the dynamics of a confined cylinder. She argues that “Today’s available numerical and experimental methods enable us to study very complex problems.  However, I believe that it is still necessary to sometimes resort to simple models and in those cases classical analysis is a powerful tool.”

 She presents her licentiate thesis in E243 10.00 15th of October followed by a discussion led by Jörgen Burman, ITT Flygt.

Ida also writes frequently about her research on her blog:

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