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<p>Jet pumps as a type of fluid machinery with no moving parts, are widely used in solid-liquid transport. However, their throats are susceptible to erosion, and the quantitative relationship between internal flow structures, particle dynamics, and erosion morphology evolution remains unclear. This paper establishes a unified analysis framework by combining transient CFD–DEM simulations with erosion experiments, and calibrates the erosion model using experimental data to ensure the reliability of the numerical results. The core findings reveal the intrinsic mechanism of erosion distribution: the spatial distribution of erosion is closely related to the local flow structure. The mid-section of the throat, due to the mature development of the jet and the attachment of high turbulent kinetic energy zones to the wall, exhibits significantly higher erosion than the front-section (e.g., for 34-mesh particles, the mass loss is 144% higher after 120&#xa0;h). Concurrently, particle size dictates the micro-erosion mechanism: large particles (12-mesh) have high inertia and are dominated by low-angle (10–30°) sliding cutting, forming longitudinal striations; whereas small particles (34-mesh) possess higher total kinetic energy and are easily disturbed by turbulence, leading to high-frequency, multi-angle impacts, with morphologies dominated by fatigue pits and lamellar spalling. This study establishes a quantitative correlation path from turbulent structure to particle impact and then to wear morphology, providing a physical basis for the anti-wear design of jet pumps.</p>

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Jet pump throat erosion: from flow structures to particle-induced morphology evolution

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • B. Fan,
  • M. Xu,
  • X. Wan,
  • M. Dong,
  • J. Mou,
  • Z. Tang,
  • X. Liu,
  • Z. Hu

摘要

Jet pumps as a type of fluid machinery with no moving parts, are widely used in solid-liquid transport. However, their throats are susceptible to erosion, and the quantitative relationship between internal flow structures, particle dynamics, and erosion morphology evolution remains unclear. This paper establishes a unified analysis framework by combining transient CFD–DEM simulations with erosion experiments, and calibrates the erosion model using experimental data to ensure the reliability of the numerical results. The core findings reveal the intrinsic mechanism of erosion distribution: the spatial distribution of erosion is closely related to the local flow structure. The mid-section of the throat, due to the mature development of the jet and the attachment of high turbulent kinetic energy zones to the wall, exhibits significantly higher erosion than the front-section (e.g., for 34-mesh particles, the mass loss is 144% higher after 120 h). Concurrently, particle size dictates the micro-erosion mechanism: large particles (12-mesh) have high inertia and are dominated by low-angle (10–30°) sliding cutting, forming longitudinal striations; whereas small particles (34-mesh) possess higher total kinetic energy and are easily disturbed by turbulence, leading to high-frequency, multi-angle impacts, with morphologies dominated by fatigue pits and lamellar spalling. This study establishes a quantitative correlation path from turbulent structure to particle impact and then to wear morphology, providing a physical basis for the anti-wear design of jet pumps.