Numerical Simulation on Transient Pressure Pulsations and Complex Flow Structures of a Ultra-High-Speed Centrifugal Pump at Stalled Condition

Zhenhua Zhou, Huacong Li, Jinbo Chen, Delin Li and Ning Zhang ()
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Zhenhua Zhou: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Huacong Li: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Jinbo Chen: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Delin Li: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Ning Zhang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

Energies, 2023, vol. 16, issue 11, 1-17

Abstract: A high-speed centrifugal pump is the key facility to deliver oil in an aero-engine. The stable operation is quite important to the safety of the engine. High-speed pump stability is essentially caused by the transient pressure pulsations excited by the complex flow within the pump, which needs to be clarified, especially for the pump under a rotating stall condition. In the current research, unsteady pressure pulsation and the corresponding flow distribution of the high-speed centrifugal pump are analyzed using the delayed detached-eddy simulation (DDES) method. Pressure signals within the pump are extracted by monitoring points. Results show that the dominant components in the pressure spectrum exhibit a significant difference at various flow rates, which locates at the blade passing frequency f BPF under the rated working condition and deviates to five times the shaft frequency (5f n ) at the stalled condition. Such phenomenon is not observed in the normal centrifugal pump with low speed when using numerical and experiment methods, and usually the amplitude at f BPF reaches the maximum. Under the stalled condition, the component at 0.2f n is generated and considered as the rotating stall frequency, which is the same at different stalled flow rates. From velocity distribution, it is found that several blade channels are stalled as characterized by the large-scale separation bubbles, which are induced and triggered by the volute tongue.

Keywords: high-speed centrifugal pump; transient pressure pulsation; rotating stall condition; flow structure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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