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

Author

Listed:
  • Mohsen Ebrahimi

    (Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)

  • Qiangqiang Huang

    (Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)

  • Xiao He

    (Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)

  • Xinqian Zheng

    (Turbomachinery Laboratory, State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)

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.

Suggested Citation

  • Mohsen Ebrahimi & Qiangqiang Huang & Xiao He & Xinqian Zheng, 2017. "Effects of Variable Diffuser Vanes on Performance of a Centrifugal Compressor with Pressure Ratio of 8.0," Energies, MDPI, vol. 10(5), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:682-:d:98500
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    References listed on IDEAS

    as
    1. Pei-Yuan Li & Chu-Wei Gu & Yin Song, 2015. "A New Optimization Method for Centrifugal Compressors Based on 1D Calculations and Analyses," Energies, MDPI, vol. 8(5), pages 1-18, May.
    2. Norbert Zsiga & Christoph Voser & Christopher Onder & Lino Guzzella, 2013. "Intake Manifold Boosting of Turbocharged Spark-Ignited Engines," Energies, MDPI, vol. 6(3), pages 1-18, March.
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