The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Geometrical Effects of an Active Casing Treatment on Aerodynamic Performance of a Centrifugal Compressor

능동형 케이싱 트리트먼트의 형상 변화가 원심압축기의 공력성능에 미치는 영향

  • Ma, Sang-Bum (Department of Mechanical Engineering, Graduate School, Inha University) ;
  • Kim, Kwang-Yong (Department of Mechanical Engineering, Inha University)
  • 마상범 (인하대학교 대학원 기계공학과) ;
  • 김광용 (인하대학교 기계공학부)
  • Received : 2015.12.28
  • Accepted : 2016.06.10
  • Published : 2016.08.01
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Abstract

In this study, a parametric study on a cavity as casing treatment of a centrifugal compressor has been conducted using three-dimensional Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model. Two kinds of cavity were applied at choke and surge conditions, respectively, in this work. Inlet and outlet port widths, angle of outlet port, and length of cavity were chosen as the geometric parameters and investigated to find their effects on the aerodynamic performances such as adiabatic efficiency at design mass flow rate and stall margin of the centrifugal compressor. It was found that the aerodynamic performances of the centrifugal compressor were affected considerably by the four geometric parameters. The adiabatic efficiency was hardly changed by the geometric parameters, excepts for the angle of outlet port. With an increase in the angle of outlet port, the adiabatic efficiency and the stall margin decreased. The stall margin was more sensitive to the outlet port width than to the other geometric parameters. And, with a decrease in the outlet port width, the stall margin increased by 2% compared to that of the reference.

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