Squeeze film dampers (SFDs) are effective means to reduce vibrations and to suppress instabilities in rotor-bearing systems. However, at operating conditions while traversing critical speeds with large orbital whirl motions, ingestion and entrapment of air into the thin lands of SFDs generates a bubbly mixture (air in lubricant) which is known to reduce the dynamic film pressures and the overall damping capability. This pervasive phenomenon lacks proper physical understanding and sound analytical modeling. An experimental investigation to quantify the forced performance of a SFD operating with a controlled bubbly mixture is detailed. Tests are conducted in a constrained circular orbit SFD to measure the dynamic squeeze film pressures and journal motion at two whirl frequencies (8.33 and 16.67 Hz) as the air content in the mixture increases from 0% to 100%. The analysis of period-averaged film pressures reveals a zone of uniform low pressure of magnitude equal to the discharge pressure, independently of the mixture composition. The uniform pressure zone extends as the mixture void fraction increases. Radial and tangential film forces are estimated from the dynamic pressures at two axial locations of measurement. The tangential (damping) force decreases proportionally with the mixture volume fraction, while a radial hydrostatic force remains nearly invariant. The experimental results quantify effects previously known by qualitative description only, thus providing a benchmark towards the development of sound theoretical models.
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ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
June 2–5, 1998
Stockholm, Sweden
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7866-8
PROCEEDINGS PAPER
Reduction of the Dynamic Load Capacity in a Squeeze Film Damper Operating With a Bubbly Lubricant Free
Sergio E. Diaz,
Sergio E. Diaz
Texas A&M University, College Station, TX
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Luis A. San Andrés
Luis A. San Andrés
Texas A&M University, College Station, TX
Search for other works by this author on:
Sergio E. Diaz
Texas A&M University, College Station, TX
Luis A. San Andrés
Texas A&M University, College Station, TX
Paper No:
98-GT-109, V005T14A015; 8 pages
Published Online:
December 23, 2014
Citation
Diaz, SE, & San Andrés, LA. "Reduction of the Dynamic Load Capacity in a Squeeze Film Damper Operating With a Bubbly Lubricant." Proceedings of the ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education. Stockholm, Sweden. June 2–5, 1998. V005T14A015. ASME. https://doi.org/10.1115/98-GT-109
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