The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Flow Instability Assessment Occurring in Low Flow Rate Region According to the Change of a Centrifugal Compressor Impeller Shape

원심압축기 임펠러의 형상 변화에 따른 저유량 영역에서 발생하는 불안정 유동 평가

  • Jo, Seong Hwi (Department of Mechanical Engineering, Chungnam National University) ;
  • Kim, Hong Jip (Department of Mechanical Engineering, Chungnam National University) ;
  • Lee, Myong Hee (R&D Team Technical Research Center, SeAH Engineering Co.,Ltd.)
  • 조성휘 (충남대학교 기계공학과) ;
  • 김홍집 (충남대학교 기계공학과) ;
  • 이명희 ((주)세아엔지니어링 터보사업부)
  • Received : 2015.05.22
  • Accepted : 2016.03.09
  • Published : 2016.04.01
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Abstract

The objective of present study is to assess the performance of the first stage compressor in a total 3-stage 5000 HP-level turbo compressor. CFD commercial code, CFX has been used to predict three-dimensional flow characteristics inside of the impeller. Shear Stress Transport (SST) model has been used to simulate turbulent flows through Reynolds-averaged Navier-Stokes (RANS) equations. Grid dependency has been also checked to get optimal grid distribution. Numerical results have been compared with the experimental test results to elucidate performance characteristics of the present compressor. In addition, flow characteristics of the impeller only have been studied for various blade configurations. Angular offset in leading edge of the blade has been selected for the optimal blade design. Performance characteristics in region of low mass flow rate and high pressure ratio between the impeller entrance and exit have been investigated for the selection of optimal blade design. Also, flow instability such as stall phenomena has been studied and anti-stall characteristics have been checked for various blade configurations in the operational window.

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References

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