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<p>Aiming at the significant endwall loss and tip clearance sensitivity of the rear stages in multi-stage axial compressors due to limited blade height, this paper conducts a scaled design and experimental study of a 1:1 geometric ratio four-stage compressor test piece based on the diffuser passage design concept, taking the last four stages of a seventeen-stage compressor as the research object. Through overall performance testing, inter-stage parameter measurement, and high-frequency dynamic pressure monitoring of the casing, the effects of the diffuser passage design on the overall performance, flow field structure, and stall characteristics of the compressor are systematically analyzed. The results show that with the diffuser passage design, the load of the exit stage rotor at the design condition is increased by 39.45%; meanwhile, the total pressure ratio and efficiency of the four-stage compressor at the design condition are improved by approximately 4.48% and 2.00%, respectively, and the stall margin of the four-stage compressor changes slightly. Further flow field analysis indicates that the diffuser passage design effectively alleviates the flow blockage in the endwall regions of the exit stage rotor and enhances the pressure rise capability of the preceding stages. This study verifies the effectiveness of the diffuser passage design in improving the performance of low-load exit stages, providing experimental basis for its application in multi-stage compressor environments.</p>

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Experimental Study on Diffuser Passage of Exit Stage Rotor in a Multistage Axial Compressor

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Xiaoyu Zhang,
  • Yun Jin,
  • Ruohan Hou,
  • Fanxing Meng,
  • Shidi Zhao,
  • Wentao Wang,
  • Jichao Li,
  • Shaojuan Geng,
  • Hongwu Zhang,
  • Qiang Du

摘要

Aiming at the significant endwall loss and tip clearance sensitivity of the rear stages in multi-stage axial compressors due to limited blade height, this paper conducts a scaled design and experimental study of a 1:1 geometric ratio four-stage compressor test piece based on the diffuser passage design concept, taking the last four stages of a seventeen-stage compressor as the research object. Through overall performance testing, inter-stage parameter measurement, and high-frequency dynamic pressure monitoring of the casing, the effects of the diffuser passage design on the overall performance, flow field structure, and stall characteristics of the compressor are systematically analyzed. The results show that with the diffuser passage design, the load of the exit stage rotor at the design condition is increased by 39.45%; meanwhile, the total pressure ratio and efficiency of the four-stage compressor at the design condition are improved by approximately 4.48% and 2.00%, respectively, and the stall margin of the four-stage compressor changes slightly. Further flow field analysis indicates that the diffuser passage design effectively alleviates the flow blockage in the endwall regions of the exit stage rotor and enhances the pressure rise capability of the preceding stages. This study verifies the effectiveness of the diffuser passage design in improving the performance of low-load exit stages, providing experimental basis for its application in multi-stage compressor environments.