Effect of Partial Shrouds on the Performance and Flow Field of a Low-Aspect-Ratio Axial-Flow Fan Rotor

Table 1

Details of the low-aspect-ratio axial-flow fan.

Design volume flow, 𝑉	2.5 m^3/s	Specific work, 𝑊	650 m^2/s^2
Speed, 𝑛	1450 rpm	Shape number, 𝑁𝑠ℎ=𝑛√𝑉/(60𝑊^0.75)	0.30
Design flow coefficient, 𝜙𝑑	0.52	Design pressure rise coefficient, 𝜓𝑑	0.58
Rotor hub diameter, 𝑑ℎ	450 mm	Rotor tip diameter, 𝑑𝑡	580 mm
Casing inner diameter, 𝑑𝑐	583 mm	Rotor tip clearance, 𝑡(𝑡/𝐶ℎ*100%)	1.5 mm (1.1%)
Number of rotor blades, 𝑍𝑅	14	Rotor aspect ratio, AR𝑅	0.48
NACA 0008 type FRP rotor blades	—	Free vortex design	—
Number of stator blades, 𝑍𝑆	13	Stator aspect ratio, AR𝑆	0.46
Circular arc sheet metal stator blades	—	Stator chord, Ch𝑆	145 mm
Stator inlet angle, 𝛼2𝑏	54°	Stator exit angle, 𝛼3𝑏	100°

(All angles are w.r.t. tangential direction).