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Design method of low pressure fluctuation centrifugal pump in pumped compressed air energy storage system

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  • Lu, Yangping
  • Tan, Lei

Abstract

Pumped compressed air energy storage combines the characteristics of pumped hydro energy storage and compressed air energy storage, and has the advantages of high energy efficiency and short construction period. Centrifugal pump is the key equipment of energy conversion in the pumped compressed air energy storage system, and its safe and stable operation is of great importance. In this work, a three-segment quartic function of blade load is proposed to accurately control the blade load distribution, and a pressure fluctuation suppression index is proposed to quantitatively evaluate fluctuation amplitude, and a design method of low pressure fluctuation centrifugal pump is established. The design method is applied to a centrifugal pump with a specific speed of 147. Numerical simulation results show that the After load hub effectively suppresses the jet-wake structure at impeller outlet, reducing the intensity of wake vortex, trailing edge vortex, and tongue vortex. The After load hub prevents the shedding, collision, and merging of vortices, thereby eliminating pressure fluctuations in low-frequency range below the blade passing frequency. The After-Fore impeller with the lowest pressure fluctuation is manufactured, and the experimental measurements are conducted on the After-Mid impeller and After-Fore impeller. Compared with the After-Mid pump, the average dimensionless pressure fluctuation coefficient of the After-Fore pump decreases by 10.19%.

Suggested Citation

  • Lu, Yangping & Tan, Lei, 2026. "Design method of low pressure fluctuation centrifugal pump in pumped compressed air energy storage system," Energy, Elsevier, vol. 360(C).
    • Handle: RePEc:eee:energy:v:360:y:2026:i:c:s0360544226016233
    DOI: 10.1016/j.energy.2026.141517
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