Links between Main Frequencies of Established Rotating Stall and Rotational Frequencies and/or Blade Passing Frequencies

Table 2

Summary characteristics of change of parameters by used types of blades.

Hub/Tip ratio 𝜈	0.55; 0.7
Number of rotor blades, z	16; 20
Number of stator blades, z	19; 23
Chord length L (mm)	50–60
Height of blades h (mm)	60; 90
Height/chord h/L	0.909–1.5
Rotor speed	Variable up to 4500 rpm
Rotor frequency	75 Hz; 70 Hz; 66.7 Hz; 60 Hz
Blade passing frequencies	960–1500 Hz