抄録
In this study, numerical prediction of far field sound generated from a small box fan by using the decoupled method with large eddy simulation for incompressible flow and with computational aeroacoustics (CAA) in effect of sound reflection on test facility is performed. It is investigated the influence of 2 types grid of prism mesh and tetra mesh around blades on performance and aerodynamic sound spectrum. Also, far field sound spectra by CAA at observation point are compared to prediction by Curle’s equation(2) based on calculated fluid force on blade surface. As a result, sound field distribution in effect of the sound reflection has different characteristics for sound field with free space.
