Modeling of high speed micro rotors in moderate flow


Dikmen, E. and Hoogt, P.J.M. van der and Aarts, R.G.K.M. (2008) Modeling of high speed micro rotors in moderate flow
In: Conference proceedings of ISMA2008. The PMA Noise & Vibration research group.

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Abstract:The recent developments in high speed micro rotating machinery lead to the need for multiphysical
modeling of the rotor and the surrounding medium. In this study, thermal and flow induced effects on
rotor dynamics of geometries with moderate flow confinement are studied. The structure is modeled via
finite elements based on Timoshenko beams. Flow induced forces are implemented to the structure as
added mass, stiffness and damping at each node. The temperature increase in the air gap, resulting from air
friction is modeled via thermal networks in steady state as a function of rotation speed. The changed
temperature affects the air properties and therefore the flow induced forces have to be recalculated. In this
way, thermal and fluid effects in medium gap confinements are coupled with the rotordynamic model and
their effects on critical speeds and vibration response can be investigated
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Engineering Technology (CTW)
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