Study on pressure field characteristics of high specific speed axial flow pump under full working conditions based on wavelet transform

作者：Chongyang Hu, Xiaowen Zhang, Wen Zhong Shen, Haiyu Liu, Fangping Tang, Bipeng Yan · 发表于：Physics of Fluids · 年份：2025 · DOI：10.1063/5.0253920 · 被引用次数：12 · 研究领域：Hydraulic and Pneumatic Systems、Cavitation Phenomena in Pumps、Oil and Gas Production Techniques

Axial flow pumps are widely used in ship jet propulsion units and coastal plain pumping stations. In the actual operation process, axial flow pumps need to operate in extreme working conditions, in order to explore the safety and stability of axial flow pumps operating under special working conditions, this paper adopts a method that combines model experiment and numerical simulation. A full-condition model experiment of the axial flow pump section (AFPS) is carried out on the high-precision axial flow pump system test platform. Meanwhile, a simulation model predicting the full characteristics of the AFPS is constructed. Numerical simulations are carried out for the AFPS at 31 flow rates, and the hydrodynamic characteristics of the AFPS are investigated in depth in 8 conditions, which reveals the internal evolution of the AFPS under the synergistic influence of the water flow direction and the impeller steering in the whole quadrant. The traditional analysis method Fast Fourier Transform is difficult to analyze the dynamic changes of such a complex non-smooth signal in the flow field under full operating conditions of axial flow pumps. In this paper, the wavelet transform is used to analyze the pressure pulsation signals in the time–frequency two-dimensional plane at multiple scales, to capture the time–frequency subtle changes, and the cross wavelet transform reveals the signal relationships at different locations, which comprehensively and deeply reveals the pressure pulsat...