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Flow Instability Assessment Occurring in Low Flow Rate Region According to the Change of a Centrifugal Compressor Impeller Shape
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 Title & Authors
Flow Instability Assessment Occurring in Low Flow Rate Region According to the Change of a Centrifugal Compressor Impeller Shape
Jo, Seong Hwi; Kim, Hong Jip; Lee, Myong Hee;
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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.
 Keywords
Centrifugal Compressor;Impeller;CFD;Stall;Surge;Performance Curve;Flow Instability;
 Language
Korean
 Cited by
 References
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