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<p>To examine the internal flow characteristics and component interactions in the stationary part of the intermediate stage of a high-flow-coefficient centrifugal compressor, four configurations were generated by progressively adding bend sections. Numerical simulations were performed to study the coupling effects among the components of the return channel. The results show a strong interaction between the inlet/outlet bends and the return vanes, as reflected in the distributions of the total pressure loss coefficient and the airflow angle. The U-bend was identified as the main source of loss. The inlet flow profile considerably affects the losses inside the return channel; analysing the vanes alone while neglecting the bends does not represent the actual flow. On the basis of the revealed interaction mechanisms, the meridional contour on the hub side of the U-bend—where losses were highest—was redesigned. The modified geometry improved the off-design efficiency by 0.5 % overall and suppressed flow separation on the hub side of the return vanes.</p>

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The flow coupling mechanism between the components and the modified design of a centrifugal compressor return channel

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Kaikai Zhao,
  • Lin Zhang,
  • Fei Ren,
  • Kang Li

摘要

To examine the internal flow characteristics and component interactions in the stationary part of the intermediate stage of a high-flow-coefficient centrifugal compressor, four configurations were generated by progressively adding bend sections. Numerical simulations were performed to study the coupling effects among the components of the return channel. The results show a strong interaction between the inlet/outlet bends and the return vanes, as reflected in the distributions of the total pressure loss coefficient and the airflow angle. The U-bend was identified as the main source of loss. The inlet flow profile considerably affects the losses inside the return channel; analysing the vanes alone while neglecting the bends does not represent the actual flow. On the basis of the revealed interaction mechanisms, the meridional contour on the hub side of the U-bend—where losses were highest—was redesigned. The modified geometry improved the off-design efficiency by 0.5 % overall and suppressed flow separation on the hub side of the return vanes.