Numerical Investigation of Pressure Fluctuation Characteristics in a Centrifugal Pump with Variable Axial Clearance

Table 1

Basic parameters of the pump.

Parameter	Value
Impeller inlet diameter	mm
Impeller outlet diameter	mm
Blade number
Blade inlet angle	°
Blade outlet angle	°
Blade outlet width	mm
Back-blade number
Back-blade width (axial direction)	mm
Back-blade inlet angle	°
Back-blade outlet angle	°
Volute casing width at impeller outlet	mm
Blade-tongue gap
Specific speed
Design flow rate	m^3/s
Design head	m

Specific speed is defined as , where n is the rated rotational speed, r/min. The unit of is usually ignored.