Due to a current trend of increasing rotational speed and power, the problem of tone noise and pressure pulsation in centrifugal ventilators becomes a more urgent issue. Often the level of tones determines noise characteristicsmainly these are blade-passing frequencies (BPF). The broadband noise resulting from small-scale turbulent pressure pulsation and secondary flows is an important problem as well. Numerical studies of pressure pulation in ventilators are undertaken using the method based on a representation of non-stationary motion of a compressible medium as a combination of acoustic and vortex modes.

Download: S.Timouchev, J.Tourret, G.Pavic, A. Aksenov: Numerical methods for computation of internal unsteady pressure field & sound near field of fans, 2003 year, PDF, 844 KB