Application of a Beamforming Technique to the Measurement of Airfoil Leading Edge Noise

Table 2

Airfoil models used in the experiments (all airfoils have a chord length of 0.235 m and a span width of approximately 0.4 m).

Name	Material	𝑟 [Pa s/m^2]
Reference	Nonporous	∞
Needlona felt SO 2002	Synthetic felt	130,200
Recemat	Metal foam	8,200
M–Pore Al 45 ppi	Metal foam	1,000