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Centrifugal compressor tip clearance and impeller flow

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Abstract

Compressors consume a considerable portion of the electricity used in the industrial sector. Hence, improvements in compressor efficiency lead to energy savings and reduce environmental impacts. The efficiency of an unshrouded centrifugal compressor suffers from leakage flow over the blade tips. The effect of tip leakage flow on the passage flow differs between the full and splitter blade passages. In this study, the differences in the flow fields between the full and splitter blade passages were studied numerically in detail. An industrial high-speed compressor with a design pressure ratio of 1.78 was modelled. Numerical studies were conducted with six different tip clearances and three different diffuser widths. The results show that increasing tip clearance considerably increases the reversed flow into the impeller with an unpinched diffuser. The reversed flow then partly mixes into the flow in the same blade passage it entered the impeller and the rest migrates over the blade, mixing with the tip clearance flow. Furthermore, as the reversed and clearance flow mix into the wake, the wake is weakened. As pinch reduces both the reversed flow and clearance flow, the passage wakes are stronger with pinches. However, the pinch is beneficial as the losses at the impeller outlet decrease.

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Authors and Affiliations

  1. Laboratory of Fluid Dynamics, LUT School of Energy Systems, Lappeenranta University of Technology, Lappeenranta, Finland

    Ahti Jaatinen-Värri, Jonna Tiainen, Teemu Turunen-Saaresti, Aki Grönman, Alireza Ameli & Jari Backman

  2. Turbomachinery Laboratory, Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan, USA

    Abraham Engeda

Authors
  1. Ahti Jaatinen-Värri
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  2. Jonna Tiainen
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  3. Teemu Turunen-Saaresti
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  4. Aki Grönman
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  5. Alireza Ameli
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  6. Abraham Engeda
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  7. Jari Backman
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Correspondence to Ahti Jaatinen-Värri.

Additional information

Recommended by Associate Editor Weon Gyu Shin

Ahti Jaatinen-Värri is an Associate Professor at the Laboratory of Fluid Dynamics, in Lappeenranta University of Technology, Finland. His main areas of interest are internal flows in various high-speed turbomachinery, especially centrifugal compressor aerodynamics.

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Jaatinen-Värri, A., Tiainen, J., Turunen-Saaresti, T. et al. Centrifugal compressor tip clearance and impeller flow. J Mech Sci Technol 30, 5029–5040 (2016). https://doi.org/10.1007/s12206-016-1022-8

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  • DOI: https://doi.org/10.1007/s12206-016-1022-8

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