No abstract

Centrifugal blowers are widely used in heating, ventilation and air-conditioning to generate high mass flow in compact geometries. Confined configurations imply important interactions between the impeller and the volute casing, which causes acoustic tonal noise. This study is focused on the simulation of the noise propagation into a subsonic centrifugal blower. In this confined domain, integral methods in acoustic reach their limits since they do not take into account reflection and diffraction. Instead, this near-field propagation issue is tackled here by the use of a wave propagation operator such as Linearized Perturbed Compressible Equations (LPCE). First, a simple acoustic source model is proposed. Then, sources are extracted from CFD computations. This two kind of sources are experimented as inputs into the propagation operator. Spatial resolution is enforced by a high order finite volume CAA solver (FV-MLS). The moving parts are taken into account through an innovative sliding-mesh approach.