The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Effect of the Dihedral Stator on the Loss in a Transonic Axial Compressor

상반각 정익이 천음속 축류 압축기 손실에 미치는 영향에 관한 연구

  • 황동하 (포항공과대학교 기계공학과 대학원) ;
  • 최민석 (명지대학교 기계공학과) ;
  • 백제현 (포항공과대학교 기계공학과)
  • Received : 2014.12.10
  • Accepted : 2015.07.21
  • Published : 2015.10.01
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Abstract

This paper presents a numerical investigation of the effect of the dihedral stator on the loss in a transonic axial compressor. Four stator geometries with different stacking line variables are tested in the flow simulations over the whole operating range. It is found that a large shroud loss at the rotor outlet and the subsequent shroud corner separation in the stator passage occur at low mass flow rate. The hub dihedral stator and bowed blade generate unexpected hub-corner-separation, thereby causing a large total pressure loss over the entire operating range. However, the corresponding blockage forces the high momentum flow near the hub to divert toward the upper part of the passage suppressing the negative axial velocity region. The dihedral stator increases deflection angle and secondary vorticity near the endwall where the dihedral is applied. As a result, the endwall loss which is related to the endwall relative velocity decreases.

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References

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