Design Optimisation of a Strongly Interacting Diffuser Pump Stage

Design Targets
Investigate detailed flow structure and loss mechanism in a diffuser pump and redesign impeller and diffuser blade to reduce losses and improve stage efficiency.

Deliverables
Redesigned geometry of the impeller and diffuser.

Impact
Based on unsteady flow predictions the redesigned stage showed up to 4 points improvement in efficiency.

Diffuser-PumpDiffuser-Pump

Fig.1: Pump impeller and diffuser arrangement.

Fig.2: Streamline plots of the conventional diffuser showing a separation bubble

Fig.3: Streamline plots of stage designed by TURBOdesign1

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