Large eddy simulation and measurements in a turbulent rotor-stator flow
Résumé
There have been numerous numerical simulations and experimental studies of flow between rotating and stationary discs with a stationary shroud and no throughflow (a “rotor-stator cavity”) (see references in Serre et al. 2001; Poncet et al. 2005; Randriamampianina & Poncet 2006). The flow has significant industrial applications, such as internal gas-turbine flows and computer hard disks, and the geometry is relatively simple. A characteristic feature of such flows is the coexistence of adjacent coupled flow regions that are radically different in terms of the flow properties (Serre et al. 2004). Moreover, the confinement, the flow curvature and the rotation effects create a strongly inhomogeneous and anisotropic turbulence. Consequently, these flows are very challenging for numerical modelling particularly in turbulent regimes (see a review in Crespo del Arco et al. 2005). Turbulent regimes are investigated here in an annular rotor-stator cavity, using experimental measurements as well as Large-Eddy Simulation (LES). At our knowledge, there has been no efficient investigation of turbulent rotor-stator flows within a closed interdisk cavity using LES. The mean flow is mainly governed by three control parameters: the aspect ratio of the cavity G(=(b-a)/h)=5, the rotational Reynolds number Re based on the outer radius b of the rotating disk and the radius ratio s(=a/b)=0.286. In this work, LES and experimental measurements have been used to characterize statistical properties of turbulent rotor-stator flows for Reynolds numbers up to one million. Till now, LES predictions have compared very favourably with experimental measurements for Reynolds number up to 0.7 million. In the oral presentation of this work it will be possible to show computations still in progress at the moment at Re equal to one million.
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