A bionic geometric modification inspired by the trailing-edge serrations of owl wings
provides a new approach for controlling the aerodynamic noise of rotary fluid machinery …

The paper presents a historical overview of the developments of aerodynamic design
methods for low-speed axial-flow fans. This historical overview starts from the first fan …

The sound generated by axial flow fans has become increasingly important in several
industrial areas. These devices represent considerable noise sources that must be …

SUMMARY A rig has been designed and constructed according to the ISO 5801 Standard,
to test fans with a maximum inlet diameter equal to 0.8 m. The rig design procedure, that …

Forward swept blades in low-speed axial fan rotors allow for appreciable gain in the stall
margin and a small percentage gain in the maximum fan efficiency if the rotor blade …

Tube-axial fans are widely used in industrial applications because of their compactness,
simplicity, and low cost. However, the achievable fan pressure rise is generally penalised by …

Rotor-only axial fans feature rotors designed according to different vortex criteria. Nowadays
the literature does not exhaustively clarify when a specific swirl distribution has to be used …

Uncertainties surrounding the influence of Reynolds number on the performance of air
handling turbomachines are as old as the study of turbomachinery fluid dynamics. In …

More than half a century has been spent by technicians involved in fans testing to suggest
and fix best practice procedures including also the definitions of several performance and …

The flow path close to the suction side of fan rotor blades mostly affects the overall drag of
the blading. The blade lift is affected as well because of the separation of the low energy …