Abstract
Periodic flows downstream from a centrifugal pump impeller in vaneless and vaned diffusers were measured by using a single hole yawmeter and a phase-locked sampling method. The flows were also calculated by an inviscid flow analysis using the blade-surface singularity method. The periodic variations in calculated static pressure with the impeller rotating quantitatively agree well with the measured ones. The flow behaviors in the vaned diffuser are discussed, citing measured and calculated results. The potential interaction between the impeller and the diffuser blades appears more strongly than the impeller-wake interaction. The appearance of static pressure fluctuations due to the impeller's rotating in the fully vaned zone is different from that in the semivaned zone of the diffuser. The existence of the peripheral blade surface of the impeller outlet with an outlet edge of the pressure surface causes violent pressure fluctuations in the vaned diffuser.
Highlights
Periodic flows downstream from a centrifugal pump impeller in vaneless and vaned diffusers were measured by using a single hole yawmeter and a phase-locked sampling method
In our previous report (Furukawa et al, 2000), it was shown that even the solution of an inviscid flow analysis by simple calculations was able to simulate the real flow in a vaneless diffuser downstream of a centrifugal impeller
The downstream flow of a centrifugal impeller in a vaned diffuser with parallel walls was measured and compared with the results calculated by an inviscid flow analysis using the bladesurface singularity method
Summary
Periodic flows downstream from a centrifugal pump impeller in vaneless and vaned diffusers were measured by using a single hole yawmeter and a phase-locked sampling method. The flows were calculated by an inviscid flow analysis using the blade-surface singularity method. The flow behaviors in the vaned diffuser are discussed, citing measured and calculated results. In our previous report (Furukawa et al, 2000), it was shown that even the solution of an inviscid flow analysis by simple calculations was able to simulate the real flow in a vaneless diffuser downstream of a centrifugal impeller. The method is extended to a flow in an impeller-and-vaned-diffuser combination, and calculated and measured results are compared. Keywords Blade rows interaction, Centrifugal pump impeller, Diffuser, Flow measurement, Inviscid flow analysis, Pressure fluctuation. In a diffuser with a combined impeller and vane, the interaction of the impeller and diffuser blades
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