Computation of Aerodynamic Noise Radiated from Ducted Tail Rotor Using Boundary Element Method

Table 1

Geometric dimensions of the ducted tail rotor.

Rotor	Radius	297 mm
	Number of blades	11
	Solidity	0.4951
	Twist angle	−12 deg
	Tip speed	74.6 m/s
	Airfoil	NACA23012 (r/R = 0.35~1.0)
Duct	Tip clearance gap	0.01R
	Inlet radius	0.2R
	Diffuser length	0.7R
	Diffuser angle	4 degrees