Open Access

ARTICLE

Numerical Investigation of Gas Binding Dynamics in Centrifugal Pumps Using LBM–LES

Xiuli Wang¹, Xinshen You^1,2, Wei Xu³, Weibin Zhang², Kehui Zhang¹, Yuanyuan Zhao^4,*

1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China
2 Key Laboratory of Fluid and Power Machinery, Xihua University, Ministry of Education, Chengdu, China
3 School of Energy and Power Engineering, Jiangsu University, Zhenjiang, China
4 School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China

* Corresponding Author: Yuanyuan Zhao. Email:

(This article belongs to the Special Issue: Fluid and Thermal Dynamics in the Development of Unconventional Resources IV)

Fluid Dynamics & Materials Processing 2026, 22(5), 5 https://doi.org/10.32604/fdmp.2026.081863

Received 10 March 2026; Accepted 24 April 2026; Issue published 27 May 2026

Abstract

Gas binding fault (GBF) represents a critical operating condition in centrifugal pumps, characterized by severe performance degradation due to gas–liquid interactions within the flow passages. To elucidate the underlying mechanisms, this study employs a coupled Lattice Boltzmann Method and Large Eddy Simulation (LBM–LES) framework to analyze the hydro–mechanical-electrical behavior of a centrifugal pump under varying inlet gas volume fractions (IGVF, β). It is shown that, at low gas content (β ≈ 3%), dispersed bubbles primarily accumulate along the blade suction surface and near the impeller outlet. As β increases to 6%, gas structures migrate toward the impeller hub, with partial transport to the outlet where gas-liquid separation becomes evident. Further increases in β promote coalescence into larger gas clusters, progressively obstructing the flow channels and intensifying flow instability. The evolution of characteristic performance indicators reveals a clear dependence on both gas content and operating conditions. At low flow rates, these indicators vary monotonically with β, whereas at higher flow rates they exhibit pronounced fluctuations, reflecting enhanced unsteadiness. In particular, the pressure coefficient remains relatively stable for β below 6%, corresponding to a non-gas-binding regime. Beyond this threshold, it decreases sharply, marking the onset of gas binding.

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Keywords

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