3D unsteady flow in a centrifugal fan: impeller - volute interaction

Younsi, Mohand and Bakir, Farid and Kouidri, Smaine and Rey, Robert (2007) 3D unsteady flow in a centrifugal fan: impeller - volute interaction. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 8 (2). pp. 211-223. ISSN 1586-2070

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Abstract

The purpose of this study is to show, using Computational Fluid Dynamics (CFD) tools, the complex phenomena related to the internal flow in a squirrel-cage fan and their influence on the aeroacoustic behaviour. These phenomena are the interactions and unsteadiness induced by the relative motion of the rotating blades compared to the volute. Thus, 3D unsteady calculation using Unsteady Reynolds Averaged Navier-Stokes (URANS) approach has been applied on the computational domains which have been divided into two zones, a rotating zone including the impeller and a stationary zone including the volute. The sliding mesh technique has been applied to the interfaces in order to allow the unsteady interactions between the two zones. The overall behaviour of the fan has been validated experimentally at different flow rates. The unsteady part is illustrated by the pressure and aerodynamic force fluctuations applied on the blade surfaces, and on different points from the lateral surface of the volute. Finally, using the pressure and the velocity fluctuations data acquired upon the surfaces of rotating blades, acoustic pressures have been computed using the Ffowcs Williams-Hawking (FW-H) analogy.

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