Numerical Investigation of Velocity Flow Field inside an Impeller Air Model of a Centrifugal Pump with Vaned Diffuser Interactions and Comparison with PIV Measurements

Table 1

Specifications of the pump.

Test conditions
Speed of rotation	1710 rpm
Normalized flow rate	𝑄^∗=𝑄/𝑄𝑛=0.934
Fluid	Air at 25^∘C
Entry duct
Diameter	0.1411 m
Length	0.5129 m
Impeller
Inlet radius	0.1411 m
Outlet radius	𝑅𝑜=0.2566 m
Number of blades	7
Outlet height	𝐵𝑜=0.0385 m
Outlet blade angle	22.5^∘
Main blade position	𝜑=30.03^∘
Design flow rate	𝑄𝑛=0.337 m^3/s
Diffuser
Inlet radius	0.2736 m
Outlet radius	0.3978 m
Number of vanes	8
Height	0.040 m
Design flow rate	0.8 Qn