Abstract
In this paper results of unsteady CFD computations of a centrifugal compressor are presented and compared to steady state solutions. Two cases are examinated, the first case is a rotor with spiral casing close to the design point. This simulations shows the unsteady rotor stator interaction. In the second case the same rotor followed by a vaneless diffuser without spiral casing is simulated at part load. The aim is to show the unsteady rotating stall effect without disturbance coming from the geometry. A frequency analysis for both cases is conducted. As expected the blade passing frequency and its multiples are dominating in the calculation with casing. For the rotating stall typical unsteady vortices are observed. The unsteady pressure fluctuations are a magnitude higher in comparison to the calculation at design point.
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Lucius, A., Brenner, G. (2010). 3D time accurate CFD simulations of a centrifugal compressor. In: Tromeur-Dervout, D., Brenner, G., Emerson, D., Erhel, J. (eds) Parallel Computational Fluid Dynamics 2008. Lecture Notes in Computational Science and Engineering, vol 74. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-14438-7_18
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DOI: https://doi.org/10.1007/978-3-642-14438-7_18
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