Contribution
Experimental Benchmarking of an Enclosed Centrifugal Fan for Fluid-Structure-Acoustic Interactions Investigations
* Presenting author
Abstract:
Centrifugal fans are used in a wide range of applications for the transport of gases and for the ventilation of buildings. They are primarily used where large pressure differences needed. In most cases, the centrifugal fan is operated as an enclosed machine with a duct system. The fan itself is a dominant noise source in these applications. Both the internal sound sources and the aerodynamic forces excite the casing of the fan. This results in a fluid-structure-acoustic interaction. The excited structure in turn emits sound into the far field, which is perceived as annoying noise by people. Understanding the FSAI of ducted centrifugal fans is a current research topic. To deepen this understanding and to provide validation data for structural and flow simulations, we created a public benchmark case of a enclosed centrifugal fan. For the experimental analysis, the aerodynamics and aeroacoustics properties of the fan were determined. In addition, velocity and pressure measurements were taken inside the flow field and the vibrations of the casing were measured using LSV. The totality of the experimental investigations carried out provides the opportunity to validate simulation codes for FSAI and to gain new insights into the sound radiation of enclosed centrifugal fans.