Abstract
Abstract
Highlights
In-depth understanding of the underlying interaction mechanisms of a rotor wake and a wing is an important topic of fundamental and applied fluid mechanic research
The test matrix included: (i) time-resolved visualisations of the propeller vortices during the interaction with the wing; (ii) particle image velocimetry (PIV) measurements over 14 evenly spaced vertical-chordwise sections of the wake from y/D = 0 to y/D = 0.5, extended from x = 0 to x = 1.83D; (iii) laser Doppler velocimetry (LDV) measurements along 2 transversal sections of the wake positioned just in front and behind the wing, each consisting of a grid of ∼700 points; (iv) LDV measurements on the wing surface using a grid of 1200 points thickened in the tip vortex region; 908 A10-12
The underlying evolution mechanisms of the tip–vortex system can be split into three phases: (i) approach phase and leading edge flow, which includes the vortex evolution before the encounter with the wing and the early interaction with the leading edge of the wing; (ii) vortex–wing interaction phase, which includes the dynamics of the vortex portions on the pressure and suction side of the wing during the penetration
Summary
In-depth understanding of the underlying interaction mechanisms of a rotor wake and a wing is an important topic of fundamental and applied fluid mechanic research. The present paper, which is a follow-up of the previous studies by Felli et al (2011) and Muscari et al (2017), is aimed at enhancing understanding of the fundamental underlying mechanisms of interaction between the vortical structures of a rotor wake and a downstream wing To this end, a comprehensive experimental survey, including detailed flow measurements by laser Doppler velocimetry (LDV) and PIV, time-resolved visualisations and detailed wall-pressure measurements, was focused on the dynamics of a multi-bladed rotor helical vortices during the approach, penetration and reconnection phases with a wing, using the same rotor blade and wing geometries as Felli et al (2011) and Muscari et al (2017).
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