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Energies 2017, 10(5), 682; doi:10.3390/en10050682

Effects of Variable Diffuser Vanes on Performance of a Centrifugal Compressor with Pressure Ratio of 8.0

Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
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Academic Editor: Antonio Calvo Hernández
Received: 4 April 2017 / Revised: 6 May 2017 / Accepted: 9 May 2017 / Published: 12 May 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

In numerous applications, centrifugal compressors are required to provide a high pressure ratio with good efficiency while also working in a wide operating range. This is a challenge because as pressure ratio increases, efficiency and operating range inevitably decline. This paper studies the effects of a variable geometry diffuser on the performance and operating range of a centrifugal compressor with high pressure ratios of up to 8.0. The numerical method employed three-dimensional Reynolds-averaged Navier-Stokes simulations. An analysis of the matching of the vaned diffuser with the impeller for different working conditions and diffuser vane angles is presented. The results show that improved matching of the adjusted diffuser increased efficiency by 4.5%. The range extension mechanism of the variable diffuser is explained, and it is shown that adjusting the vane angle by +6° to −6° extended the operating range of the compressor by up to 30.0% for pressure ratios between 5.0 and 6.0. The interaction between diffuser and impeller was examined, and the independent characteristic of the impeller is illustrated. The connection between the incidence angle at the leading edge of the impeller and flow separation near the tip of the impeller is discussed. View Full-Text
Keywords: centrifugal compressor; gas turbine; turbocharger; variable geometry; diffuser; high pressure ratio; diffuser impeller interaction; incidence angle; matching centrifugal compressor; gas turbine; turbocharger; variable geometry; diffuser; high pressure ratio; diffuser impeller interaction; incidence angle; matching
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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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MDPI and ACS Style

Ebrahimi, M.; Huang, Q.; He, X.; Zheng, X. Effects of Variable Diffuser Vanes on Performance of a Centrifugal Compressor with Pressure Ratio of 8.0. Energies 2017, 10, 682.

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