Influence of non-dimensional parameters on the tip leakage noise

Saraceno, Ivan, Cabre, Sergi Palleja, Paruchuri, Chaitanya and Ganapathisubramani, Bharath (2023) Influence of non-dimensional parameters on the tip leakage noise. In Proceedings of the AIAA AVIATION 2023 Forum. Aerospace Research Central.. (doi:10.2514/6.2023-3838).

Record type: Conference or Workshop Item (Paper)

Abstract

This paper experimentally characterises the flow behaviour 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 aerofoils characterised by different thicknesses were investigated. However, the thickness-to-gap ratio alone is not sufficient to define the tip flow behaviour, which instead can be defined by the pressure distribution along the tip of the aerofoil. The influence of the boundary layer thickness on the tip leakage flow was investigated, but it was found to have little impact. This study also provides insight into the dominant tip noise source, which is related to a shear layer instability that occurs downstream of the midchord.

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