The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Effects of Rotational Speed on the Performance in a Transonic Axial Compressor with a Dihedral Stator

회전속도가 상반각 정익을 적용한 천음속 축류 압축기 성능에 미치는 영향

  • Hwang, Dongha (Department of Mechanical Engineering, Graduate School, POSTECH) ;
  • Choi, Minsuk (Department of Mechanical Engineering, Myongji University) ;
  • Baek, Jehyun (Department of Mechanical Engineering, POSTECH)
  • 황동하 (포항공과대학교 기계공학과 대학원) ;
  • 최민석 (명지대학교 기계공학과) ;
  • 백제현 (포항공과대학교 기계공학과)
  • Received : 2014.05.13
  • Accepted : 2014.08.08
  • Published : 2014.10.01
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Abstract

This paper presents a numerical investigation of the effect of the rotation speed on the performance in a transonic axial compressor with the dihedral stator. Four stator geometries with different stacking line variables were tested in the flow simulations over the whole operating range. It was found that a large shroud loss at the rotor outlet and the subsequent shroud corner separation in the stator passage occurred at low mass flow rate with the 100 % design speed. The hub dihedral stator could suppress the shroud loss region and consequently improve the stall margin. In case of the 70 % design speed condition as the mass flow rate decreased, it was seen that the high loss region was placed at the midspan of the rotor passage. The dihedral stator slightly affected the local diffusion factor, but the performance of the compressor was not changed.

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References

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