The Regenerative Flow Pump, here referred to as RFP is a turbomachine capable of developing high pressure ratios in a single stage. It is also known with other names such as: • Peripheral pump; • Side channel pump; • Turbine pump; • Drag pump; • Traction pump; • Vortex pump. This paper reviews the status of the RFP and proposes a design guideline, with the aim to improve the performance and efficiency of the RFP. All previous works concentrated on the fully-developed flow region in the RFP and this work expands the consideration to the developing region.

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