Ivan Saraceno

University of Southampton · Institute of Sound and Vibration Research (ISVR)

Among the various noise sources related to duct fans, the noise generated by the interaction of the tip leakage flow with the blade geometric singularities is one of the least understood noise sources. Our past experimental investigations on a stationary aerofoil have highlighted two tip noise sources, localised at the mid-chord and at 75% of the c...

Over-Tip-Rotor (OTR) liners have been investigated over the last decades as a technology to further reduce fan broadband noise in turbofan engines. The suppression of noise with OTR liners is attributed to conventional attenuation of acoustic waves and source modification effects. This paper describes a fundamental experiment to gain a better under...

This paper experimentally characterises the flow behavior within the tip gap area of a single-fixed aerofoil by studying the influence of two non-dimensional parameters. The tip leakage flow behaviour has been previously linked to the geometric ratio between the local aerofoil thickness and the tip gap size. To explore this dependency, several aero...

Over-Tip-Rotor (OTR) liners have been investigated over the last decades as a technology to further reduce fan broadband noise in turbofan engines. It has been found that Over-Tip-Rotor liners suppress noise by conventional attenuation of acoustic waves and source modification effects. This paper describes a fundamental experiment to determine the...

Among the various noise sources related to duct fans, the noise generated by the tip leakage flow when interacts with the blade geometric singularities is one of the least understood noise sources. This paper deals with characterising the various tip noise generating mechanisms for a single-fixed aerofoil, as it is difficult to distinguish them in...

Tip-leakage noise remains one of the least understood sources of noise in ducted rotors used in industry across different sectors including aerospace, automotive, and ventilation systems. Different technologies have been proposed to reduce tip leakage noise by treating either the duct casing over the tip rotor or the blade tip itself. This work des...