Abstract
Abstract
Highlights
The use of porosity as an adaptation to traditional rigid impermeable aerofoils is a commonplace area of interest for minimising aerofoil–turbulence interaction noise (Geyer, Sarradj & Giesler 2012; Roger, Schram & De Santana 2013; Ayton 2016; Chaitanya et al 2020)
The steady aerodynamics of partially porous aerofoils have previously been predicted theoretically by Iosilevskii (2011), which has been extended to aerofoils with porosity gradients by Hajian & Jaworski (2017)
Five wings of the barn owl and nine wings of the common buzzard were investigated to obtain the data used in the present study
Summary
The use of porosity as an adaptation to traditional rigid impermeable aerofoils is a commonplace area of interest for minimising aerofoil–turbulence interaction noise (Geyer, Sarradj & Giesler 2012; Roger, Schram & De Santana 2013; Ayton 2016; Chaitanya et al 2020). These investigations, theoretical (Ayton 2016), numerical (Cavalieri, Wolf & Jaworski 2016; Bae & Moon 2011) and experimental (Geyer et al 2010; Geyer & Sarradj 2019), focus on using one uniform material to impose the porosity, with chordwise variations achieved only through the use of partially porous aerofoils wherein there is an unavoidable and instantaneous variation of the boundary from impermeable to permeable At this junction, additional noise is generated by edge scattering (Rienstra & Peake 2005; Ayton 2016). Throughout this paper, we pay particular attention to monotonic porosity distributions as inspired by two species of birds: barn owls (tyto alba), known for their silent flight (Graham 1934; Lilley 1998), and common buzzards (buteo buteo) We recreate these chordwise-varying porosity distributions in our flat-plate model as an initial study into the effects of porosity distributions on both aerofoil–turbulence interaction noise and potential lift, before considering more general monotonic distributions.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
