324
P. Liu
in total and all of them are noise reduced. The power system adopts fan antitwist deflector system, with motor power of 3500 kW and fan design speed
of 350 rpm, which is composed of 16 blades, 7 anti-twist deflectors, 5 front
cover support pieces, 3 rear cover support pieces, fairing, and motor. The fan
system is designed with high efficiency and low noise aerodynamic optimization. The total length of the wind tunnel is 96 m, the total width is 38 m,
and the total height is 9 m. The three-dimensional layout of the wind tunnel
is shown in Fig. 4.30.
The diameter of the fan system in this wind tunnel is D = 7.5 m, the
ratio of propeller to hub is 0.6 (too large ratio of propeller to hub will cause
too long tail cone of fairing or too large tail diffusion loss, too small ratio of
propeller to hub will cause low axial speed of fan passage, decreased efficiency,
and increased noise), the number of fan blades is 16 (GOE797 airfoil in blade
root area, GOE796 airfoil in blade tip area), the number of anti-twist guide
vanes is 7 (C4 airfoil), and the number of the fan front cover support plates
is 5 (NACA0012 airfoil) and the number of the fantail cover support plates is
3 (NACA0012 airfoil). The total length of the fan system is 21 m, the chord
(a) Top view
(b) Side view
Fig. 4.30 The three-dimensional model of the wind tunnel
P. Liu
in total and all of them are noise reduced. The power system adopts fan antitwist deflector system, with motor power of 3500 kW and fan design speed
of 350 rpm, which is composed of 16 blades, 7 anti-twist deflectors, 5 front
cover support pieces, 3 rear cover support pieces, fairing, and motor. The fan
system is designed with high efficiency and low noise aerodynamic optimization. The total length of the wind tunnel is 96 m, the total width is 38 m,
and the total height is 9 m. The three-dimensional layout of the wind tunnel
is shown in Fig. 4.30.
The diameter of the fan system in this wind tunnel is D = 7.5 m, the
ratio of propeller to hub is 0.6 (too large ratio of propeller to hub will cause
too long tail cone of fairing or too large tail diffusion loss, too small ratio of
propeller to hub will cause low axial speed of fan passage, decreased efficiency,
and increased noise), the number of fan blades is 16 (GOE797 airfoil in blade
root area, GOE796 airfoil in blade tip area), the number of anti-twist guide
vanes is 7 (C4 airfoil), and the number of the fan front cover support plates
is 5 (NACA0012 airfoil) and the number of the fantail cover support plates is
3 (NACA0012 airfoil). The total length of the fan system is 21 m, the chord
(a) Top view
(b) Side view
Fig. 4.30 The three-dimensional model of the wind tunnel