Experiments on the Use of Signal Visualization Technique for In-Service Stall Detection in Industrial Fans

Table 1

Specifications of AC90/6/28 fan.

Blade geometry	AC90/6 fans
	Hub	Tip
𝑙/𝑡	1.32	0.31
Pitch angle (deg)	36	28
Camber angle (deg)	46	41
Solidity	1.24	0.3
Fan rotor
Blade number	6
Blade tip pitch angle (deg)	28
Blade tip stagger angle (deg)	62
Hub-to-casing diameter ratio	0.22
Tip diameter (mm)	900.0
Rotor tip clearance (% span)	1.0
Rated rotational frequency (rpm)	935 ÷ 950