Aerodynamic foil bearings are suitable to support light, high-speed rotors under extreme operating conditions such as very low or very high temperatures, e.g. in cooling turbines, small gas turbines or exhaust gas turbochargers. The required bearing load capacity is generated by an aerodynamic pressure build-up in the corresponding lubrication gap. Due to the high dependence of the bearing performance on the bore geometry, the rotordynamic behavior (e.g. bearing stability) and static properties (e.g. load capacity) as a function of radial clearance and hydrodynamic preload are one of the main points of interest in recent studies. The outcome of both the experimental and the numerical investigations show the advantages and disadvantages of the various configurations of the bearing bore in different operating conditions. These observations lead to the basic idea of an adaptive air foil bearing (AAFB) in which, depending on the operating conditions, the bearing bore contour is changed by means of piezoelectric actuators applied to the compliant supporting shell. Similar to other shape morphing approaches, optimization with regard to various components of the mechanism is the next step in the design process after targeting the design pattern. This paper concentrates on an AAFB as an efficient approach to actively shape the contour of the bore clearance in a 3-pad bearing. Numerous FEM analyses of a functional model for an AAFB in addition to the experimental efforts reveal the main concerns of the design. Finally, the result of this study is a working graph for the AAFB under various loading conditions while operating with different input voltages of the actuators.
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5114-2
PROCEEDINGS PAPER
Design Characteristics of an Aerodynamic Foil Bearing With Adaptable Bore Clearance Available to Purchase
Hossein Sadri,
Hossein Sadri
TU Braunschweig, Braunschweig, Germany
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Henning Schlums,
Henning Schlums
TU Braunschweig, Braunschweig, Germany
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Michael Sinapius
Michael Sinapius
TU Braunschweig, Braunschweig, Germany
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Hossein Sadri
TU Braunschweig, Braunschweig, Germany
Henning Schlums
TU Braunschweig, Braunschweig, Germany
Michael Sinapius
TU Braunschweig, Braunschweig, Germany
Paper No:
GT2018-76204, V07BT34A031; 12 pages
Published Online:
August 30, 2018
Citation
Sadri, H, Schlums, H, & Sinapius, M. "Design Characteristics of an Aerodynamic Foil Bearing With Adaptable Bore Clearance." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 7B: Structures and Dynamics. Oslo, Norway. June 11–15, 2018. V07BT34A031. ASME. https://doi.org/10.1115/GT2018-76204
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