September 10, 2025ActuatorsOpen Access

The Impact of Pump Cavity Gaps on the Flow Characteristics of Helical Mixed-Flow Pumps

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Numerical simulations reveal that varying pump cavity gaps affects flow stability and energy loss in helical mixed-flow pumps.

A gap coefficient of 0.15 enhances efficiency and suppresses leakage under low-flow conditions, achieving peak efficiency of 75%.
The numerical simulations link gap sizes to flow stability, showing a 1.9 m head at optimal dimensions.
Investigations confirm that smaller gaps worsen flow separation at high rates while larger gaps lead to leakage losses.
The findings offer theoretical insights into the design of helical mixed-flow pumps, impacting both efficiency and performance.

Han et al. (2025) studied this question.

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