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Appl. Sci. 2017, 7(1), 16; doi:10.3390/app7010016

Comparison of Cooling Different Parts in a High Pressure Ratio Centrifugal Compressor

Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
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Academic Editor: Michel De Paepe
Received: 5 October 2016 / Revised: 18 November 2016 / Accepted: 12 December 2016 / Published: 22 December 2016
(This article belongs to the Section Energy)
View Full-Text   |   Download PDF [3918 KB, uploaded 22 December 2016]   |  

Abstract

Cooling in a centrifugal compressor can improve the performance and reduce the impeller temperature. In a centrifugal compressor, external walls can be cool down, which is known as the shell cooling. This method avoids undesirable effects induced by other cooling methods. Cooling can be applied on different external walls, such as the shroud, diffuser or the back plate. This paper focuses on seeking the most effective cooling place to increase the performance and reduce the impeller temperature. It is found that shroud cooling improves the compressor performance the most. Shroud cooling with 2400 W of cooling power increases the pressure ratio by 4.6% and efficiency by 1.49%. Each 500 W increase in the shroud cooling power, increases the efficiency by 0.3%. Diffuser cooling and back plate cooling have an identical effect on the polytropic efficiency. However, back plate cooling increases the pressure ratio more than diffuser cooling. Furthermore, only back plate cooling reduces the impeller temperature, and with 2400 W of cooling power, the impeller temperature reduces by 45 K. View Full-Text
Keywords: integrated cooling; high pressure ratio; centrifugal compressor; performance; impeller temperature integrated cooling; high pressure ratio; centrifugal compressor; performance; impeller temperature
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Moosania, S.M.; Zheng, X. Comparison of Cooling Different Parts in a High Pressure Ratio Centrifugal Compressor. Appl. Sci. 2017, 7, 16.

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