유체기계공업학회:학술대회논문집
- 유체기계공업학회 2000년도 유체기계 연구개발 발표회 논문집
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- Pages.236-244
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- 2000
원심압축기 임펠러의 Blockage와 Slip 특성에 관한 수치연구
Numerical Study on Blockage and Slip Characteristics of Centrifugal Compressor Impellers
초록
As the second part of the author's study, the aerodynamic blockage and the slip factor of 8 centrifugal compressor impellers are investigated, when the flow rate is changed from numerical stall to choke, using three-dimensional Navier-Stokes analysis results. Based on all the exit blockage distributions, an improved model equation with two adjusting coefficients is developed for the use in design processes with the agile engineering purpose. A popular expression of constant slip factors, the Wiesner's equation, cannot be applied in design processes when more accurate prediction is strongly required at design and off-design points. Slip factor variation is found to be also influenced by the blade loadings at midspan. When the flow rate is changed, a pattern of the slip factor variations is assumed to be a simple form which can be explained using midspan blade loading distributions.