The Mechanical Impact of Aerodynamic Stall on Tunnel Ventilation Fans

Table 1

Fan data.

Nominal speed	980 rpm
Tip speed	115 m/s
Nominal pressure coefficient, Ψnom	0.189
Nominal flow coefficient, Φnom	0.220
Duty point efficiency, 𝜂tot	0.69
Tip diameter	2,240 mm
Blade height	720 mm
Blade chord at the tip	163 mm
Tip stagger angle	70°
Tip gap (% of fan diameter)	0.45%
Blade count	16
Tipsolidity	0.37