Influences of the Flow Cut and Axial Lift of the Impeller on the Aerodynamic Performance of a Transonic Centrifugal Compressor

Kun Sung Park, In Hyuk Jung, Sung Jin You, Seung Yeob Lee, Ali Zamiri and Jin Taek Chung
Additional contact information
Kun Sung Park: Department of Mechanical Engineering, Graduate School of Korea University, 02841 Seoul, Korea
In Hyuk Jung: Department of Mechanical Engineering, Graduate School of Korea University, 02841 Seoul, Korea
Sung Jin You: Department of Mechanical Engineering, Graduate School of Korea University, 02841 Seoul, Korea
Seung Yeob Lee: Department of Mechanical Engineering, Graduate School of Korea University, 02841 Seoul, Korea
Ali Zamiri: Department of Mechanical Engineering, Korea University, 02841 Seoul, Korea
Jin Taek Chung: Department of Mechanical Engineering, Korea University, 02841 Seoul, Korea

Energies, 2019, vol. 12, issue 23, 1-20

Abstract: In this study, the influences of the flow cut and axial lift of the impeller on the aerodynamic performance of a transonic centrifugal compressor were analyzed. The flow cut is a method to reduce the flow rate by decreasing the impeller passage height. The axial lift is a method of increasing the impeller passage height in the axial direction, which increases the impeller exit width (B2) and increases the total pressure. A NASA CC3 transonic centrifugal compressor with a backswept angle was used as a base compressor. After applying the flow cut, the total pressure at the target flow rate was lower than the total pressure at the design point due to the increase in the relative velocity at the impeller exit. After applying the axial lift, the total pressure at the design flow rate was increased, which was caused by the reduction in the relative velocity as the passage area at the impeller exit was increased. By applying the flow cut and axial lift methods, it was shown that the variation in relative velocity at the impeller exit has a significant effect on the variation in total pressure. In addition, it was found that the relative velocity at the impeller exit of the target flow rate is maintained similar to the base impeller when the flow cut and the axial lift are combined. Therefore, by combining the flow cut and the axial lift, three transonic centrifugal impellers with flow fractions of 0.7, 0.8, and 0.9 compared to the design flow rate were newly designed.

Keywords: transonic centrifugal compressor; backswept angle; flow cut; axial lift; relative velocity; aerodynamic design; impeller (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/23/4503/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/23/4503/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:23:p:4503-:d:291319

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().