Vibration of Shaft System in the Mixed-Flow Pump Induced by the Rotor-Stator Interaction under Partial Load Conditions

Table 1

Specifications of the investigated pump.

	Variable name	Value
Impeller
Number of blades	Zi	4
Inlet radius	R1	92.6 mm
Outlet radius	R2	121.6 mm
Inlet blade angle	β1	53.5°
Outlet blade angle	β2	58.4°
Diffuser
Number of blades	Zd	7
Inlet radius	R3	133.3 mm
Outlet radius	R4	140.9 mm
Inlet blade angle	α3	24.0°
Outlet blade angle	α4	26.0°
Design operating point
Volume flow rate	Qdes	380 m^3/h
Rotating speed	ndes	1450 r/min
Delivery head	Hdes	6 m
Specific speed	ns	480