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International Conference on Rotor Dynamics

IFToMM 2018: Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM pp 223–235Cite as

Selection of the Bearing System for a 1 kW ORC Microturbine

Part of the Mechanisms and Machine Science book series (Mechan. Machine Science,volume 60)

Abstract

The article describes an analysis of various bearing systems for the rotor of an ORC turbine with an electric power of 1 kW. The nominal rotational speed of the newly designed single-stage axial-flow turbine is 100,000 rpm. The turbine is supplied with a low-boiling medium’s vapor and this medium is not compatible with all typical materials used for constructing power turbines. Additionally, the turbine must be an oil-free machine. In one of the design variants, the turbine rotor disk is to be made of plastic and the temperature of the working medium directed to the vanes will be approx. 150°C (at a pressure of 10 bar). Three different bearing systems were considered: 1. bearings lubricated with a low-boiling medium’s liquid; 2. gas bearings lubricated with a low-boiling medium’s vapor; 3. rolling bearings. After initial analysis, it was found that hydrodynamic bearings lubricated with a low-boiling medium did not work properly in this case and it was decided to conduct a detailed analysis of the second and third type of bearings. The two bearing systems are associated with changes in the geometry of the rotor, which in turn strongly affect the dynamic performance of the entire rotating system. The dynamic analysis of the rotor is the subject of the conducted research and constitutes part of the bearing selection process. This article presents the process of selecting and optimizing the bearing system for the rotor of a 1 kW turbine.

Keywords

  • High-speed bearings
  • Microturbine
  • ORC system

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Acknowledgments

This work has been funded by the Polish Agency for Enterprise Development and Smart Growth Operational Programme (European funds) within the project No. POIR.02.03.02-22-0009/15 carried out in cooperation with the SARK company.

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Authors and Affiliations

  1. Institute of Fluid Flow Machinery, Polish Academy of Sciences, 80-283, Gdansk, Poland

    Łukasz Breńkacz, Grzegorz Żywica & Małgorzata Bogulicz

Authors
  1. Łukasz Breńkacz
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  2. Grzegorz Żywica
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  3. Małgorzata Bogulicz
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Corresponding author

Correspondence to Łukasz Breńkacz .

Editor information

Editors and Affiliations

  1. Faculty of Mechanical Engineering, University of Campinas, Campinas, São Paulo, Brazil

    Prof. Dr. Katia Lucchesi Cavalca

  2. Mechanical Engineering Department, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil

    Prof. Dr. Hans Ingo Weber

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Breńkacz, Ł., Żywica, G., Bogulicz, M. (2019). Selection of the Bearing System for a 1 kW ORC Microturbine. In: Cavalca, K., Weber, H. (eds) Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM. IFToMM 2018. Mechanisms and Machine Science, vol 60. Springer, Cham. https://doi.org/10.1007/978-3-319-99262-4_16

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  • DOI: https://doi.org/10.1007/978-3-319-99262-4_16

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