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Appl. Sci. 2018, 8(8), 1347;

Analysis and Improvement of a Two-Stage Centrifugal Compressor Used in an MW-Level Gas Turbine

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Author to whom correspondence should be addressed.
Received: 6 July 2018 / Revised: 1 August 2018 / Accepted: 7 August 2018 / Published: 10 August 2018
(This article belongs to the Special Issue Radial Turbomachinery Aerodynamics)
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The performance of a low/high-pressure-stage centrifugal compressor in a land-use MW-level gas turbine with a pressure ratio of approximately 11 is analyzed and optimized with a 1D aerodynamic design and modeling optimization system. 1D optimization results indicate that the diameter ratio of the low-pressure-stage centrifugal compressor with a vane-less diffuser, and the divergent angle of the high-pressure-stage centrifugal compressor with a vaned diffuser, are extremely large and result in low efficiency. Through modeling design and optimization system analysis, a tandem vaned diffuser is used in the low-pressure stage, and a tandem vaned diffuser with splitter vanes is adopted in the high-pressure stage. Computational fluid dynamics (CFD) results show that the pressure ratio and efficiency of the optimized low/high-pressure-stage centrifugal compressor are significantly improved. Coupling calculations of the low/high-pressure stage of the original and optimized designs are conducted based on the results of MW-level gas turbine cycles. CFD results show that the pressure ratio and efficiency of the optimized two-stage centrifugal compressor increase by approximately 8% and 4%, respectively, under three typical load conditions of 100%, 90%, and 60%. View Full-Text
Keywords: centrifugal compressor; low/high-pressure-stage; optimization design; diffuser centrifugal compressor; low/high-pressure-stage; optimization design; diffuser

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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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Zhu, W.; Ren, X.-D.; Li, X.-S.; Gu, C.-W. Analysis and Improvement of a Two-Stage Centrifugal Compressor Used in an MW-Level Gas Turbine. Appl. Sci. 2018, 8, 1347.

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