September 10, 2025Physics of Fluids

Characterization of startup transition process of a large axial flow pump system with a siphon outlet channel

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Numerical simulations reveal how various factors influence startup transition in axial flow pumps, indicating design optimizations.

Opening a vacuum breaker valve shortens the startup transition process, enhancing stability.
Larger pump outflow circulations accelerate early exhaust, but hinder it later during the startup process.
Shorter durations of pump system heads lead to reduced transition times and power fluctuations at high levels.
Longer startup durations increase peak pump head, while very short startups can cause flow rate instability.

Qi et al. (2025) studied this question.

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