No abstract

This paper describes the results of a series of tests on a model scale fan rig which were carried out to investigate the sources of broadband fan noise. Various sources of turbulence were identified as sources of broadband noise, in particular rotor boundary layer, duct wall boundary layer flows and rotor wake flows impinging on stator vanes. No single dominant source of noise was found. By using fan noise prediction methods based on analytical models and measured flow parameters, reasonable predictions of the broadband fan noise levels were obtained.

No abstract

No abstract

No abstract