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Volume 7
Issue 9
10.3390/agriengineering7090270
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Study on Pressure Fluctuation Characteristics and Chaos Dynamic Characteristics of Two-Way Channel Irrigation Pumping Station Under the Ultra-Low Head Based on Wavelet Analysis

by
Weixuan Jiao
1,*,
Xiaoyuan Xi
1,
Haotian Fan
1,
Yang Chen
2,
Jiantao Shen
1,
Jinling Dou
3 and
Xuanwen Jia
1
1
College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225100, China
2
Shanghai Branch of Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Shanghai 200439, China
3
Xinji Water Conservancy Station, Yizheng 211403, China
*
Author to whom correspondence should be addressed.
AgriEngineering 2025, 7(9), 270; https://doi.org/10.3390/agriengineering7090270
Submission received: 19 June 2025 / Revised: 12 August 2025 / Accepted: 20 August 2025 / Published: 22 August 2025
Versions Notes

Abstract

Two-way channel irrigation pumping stations are widely used along rivers for irrigation and drainage. Due to fluctuating internal and external water levels, these stations often operate under ultra-low or near-zero head conditions, leading to poor hydraulic performance. This study employs computational fluid dynamics (CFD) to investigate such systems’ pressure fluctuation and chaotic dynamic characteristics. A validated 3D model was developed, and the wavelet transform was used to perform time–frequency analysis of pressure signals. Phase space reconstruction and the Grassberger–Procaccia (G–P) algorithm were applied to evaluate chaotic behavior using the maximum Lyapunov exponent and correlation dimension. Results show that low frequencies dominate pressure fluctuations at the impeller inlet and guide vane outlet, while high-frequency components increase significantly at the intake bell mouth and outlet channel. The maximum Lyapunov exponent in the impeller and guide vane regions reaches 0.0078, indicating strong chaotic behavior, while negative values in the intake and outlet regions suggest weak or no chaos. This integrated method provides quantitative insights into the unsteady flow mechanisms, supporting improved stability and efficiency in ultra-low-head pumping systems.
Keywords: two-way channel pumping station; pressure fluctuation; chaos dynamic characteristics; ultra–low–head two-way channel pumping station; pressure fluctuation; chaos dynamic characteristics; ultra–low–head

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MDPI and ACS Style

Jiao, W.; Xi, X.; Fan, H.; Chen, Y.; Shen, J.; Dou, J.; Jia, X. Study on Pressure Fluctuation Characteristics and Chaos Dynamic Characteristics of Two-Way Channel Irrigation Pumping Station Under the Ultra-Low Head Based on Wavelet Analysis. AgriEngineering 2025, 7, 270. https://doi.org/10.3390/agriengineering7090270

AMA Style

Jiao W, Xi X, Fan H, Chen Y, Shen J, Dou J, Jia X. Study on Pressure Fluctuation Characteristics and Chaos Dynamic Characteristics of Two-Way Channel Irrigation Pumping Station Under the Ultra-Low Head Based on Wavelet Analysis. AgriEngineering. 2025; 7(9):270. https://doi.org/10.3390/agriengineering7090270

Chicago/Turabian Style

Jiao, Weixuan, Xiaoyuan Xi, Haotian Fan, Yang Chen, Jiantao Shen, Jinling Dou, and Xuanwen Jia. 2025. "Study on Pressure Fluctuation Characteristics and Chaos Dynamic Characteristics of Two-Way Channel Irrigation Pumping Station Under the Ultra-Low Head Based on Wavelet Analysis" AgriEngineering 7, no. 9: 270. https://doi.org/10.3390/agriengineering7090270

APA Style

Jiao, W., Xi, X., Fan, H., Chen, Y., Shen, J., Dou, J., & Jia, X. (2025). Study on Pressure Fluctuation Characteristics and Chaos Dynamic Characteristics of Two-Way Channel Irrigation Pumping Station Under the Ultra-Low Head Based on Wavelet Analysis. AgriEngineering, 7(9), 270. https://doi.org/10.3390/agriengineering7090270

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