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<p>In this study, the impeller channel is modeled based on the blade profile, and the trajectories and collisions of particles in the buffer layer are investigated by CFD-DEM simulations and visualization experiments. It is found that the internal flow field of the channel model influences the collision of particles with the wall, and the average collision energy loss in the tangential direction is always larger than that in the normal direction throughout the flow field. In addition, the collision energy loss between particles and the wall varies in various regions along the channel, which leads to distinct peak wear regions of the wall under the three different particle size conditions. It was finally obtained that the near-wall region was more likely to form a buffer layer with higher particle distribution density under mixed particle size condition, which was more effective in mitigating the wear of the curved wall.</p>

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Study of the effect of the particle buffer layer on the wall wear in a curved flow channel

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Yi Li,
  • Weike Yang,
  • Zhe Lin,
  • Zuchao Zhu

摘要

In this study, the impeller channel is modeled based on the blade profile, and the trajectories and collisions of particles in the buffer layer are investigated by CFD-DEM simulations and visualization experiments. It is found that the internal flow field of the channel model influences the collision of particles with the wall, and the average collision energy loss in the tangential direction is always larger than that in the normal direction throughout the flow field. In addition, the collision energy loss between particles and the wall varies in various regions along the channel, which leads to distinct peak wear regions of the wall under the three different particle size conditions. It was finally obtained that the near-wall region was more likely to form a buffer layer with higher particle distribution density under mixed particle size condition, which was more effective in mitigating the wear of the curved wall.