Engineered design of modern efficient turbomachinery based on accurate model predictions is of importance as operating speed and rate power increase. Industrial applications use hydrodynamic fluid film bearings as rotor support elements due to their advantages over rolling element bearings in operating speed, system stability (rotordynamic and thermal), and maintenance life. Recently, microturbomachinery (< 250 kW) implement gas foil bearings (GFBs) as its rotor supports due to its compact design without lubricant supply systems and enhanced stability characteristics. To meet the needs from manufacturers, the turbomachinery development procedure includes a rotordynamic design and a gas foil journal bearing (GFJB) analysis in general. The present research focuses on the role of gas foil thrust bearings (GFJBs) supporting axial load (static and dynamic) in an oil-free turbo blower with a 75 kW (100 HP) rate power at 30,000 rpm. The turbo blower provides a compressed air with a pressure ratio of 1.6 at a mass flow rate of 0.92 kg/s, using a centrifugal impeller installed at the rotor end. Two GFJBs with a diameter of 66mm and a length of 50 mm and one pair of GFTB with an outer diameter of 144 mm and an inner diameter of 74 mm support the rotor with an axial length of 493 mm and a weight of 12.7 kg. A finite element rotordynamic model prediction using predicted linearized GFJB force coefficients designs the rotor-GFB system with stability at the rotor speed of 30,000 rpm. Model predictions of the GFTB show axial load carrying performance. Experimental tests on the designed turbo blower; however, demonstrate unexpected large amplitudes of subsynchronous rotor lateral motions. Post-inspection reveals minor rubbing signs on the GFJB top foils and significant wear on the GFTB top foil. Therefore, GFTB is redesigned to have the larger outer diameter of 166 mm for the enhanced load capacity, i.e., 145%, increase in its loading area. The modification improves the rotor-GFB system performance with dominant synchronous motions up to the rate speed of 30,000 rpm. In addition, the paper studies the effect of GFTB tilting angles on the system performance. Insertion of shims between the GFTB brackets changes the bearing tilting angles. Model predictions show the decrease in the thrust load capacity by as large as 86% by increase in the tilting angle to 0.0006 rad (0.03438 deg). Experimental test data verify the computational model predictions.
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February 2012
Research Papers
Rotordynamic Performance of an Oil-Free Turbo Blower Focusing on Load Capacity of Gas Foil Thrust Bearings
Tae Ho Kim,
Tae Ho Kim
Senior Research Scientist
Energy Mechanics Center,
Korea Institute of Science and Technology
, 39-1 Hawolgok-dong, Songbuk-gu, Seoul, Korea, 136-791
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Yong-Bok Lee,
Yong-Bok Lee
Principal Research Scientist
Energy Mechanics Center,
Korea Institute of Science and Technology
, 39-1 Hawolgok-dong, Songbuk-gu, Seoul, Korea, 136-791
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Tae Young Kim,
Tae Young Kim
Research Engineer
Maritime Research Institute
, Hyundai Heavy Industries Co. LTD, 1 Jeonha-dong, Dong-gu, Ulsan, Korea, 687-792
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Kyong Ho Jeong
Kyong Ho Jeong
Principal Researcher
Rotating Machinery Group, Hwang Hae Electric, 679-1, Gojan-Dong, Namdong-Gu, Inchun Metropolitan City, Korea, 405-819
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Tae Ho Kim
Senior Research Scientist
Energy Mechanics Center,
Korea Institute of Science and Technology
, 39-1 Hawolgok-dong, Songbuk-gu, Seoul, Korea, 136-791
Yong-Bok Lee
Principal Research Scientist
Energy Mechanics Center,
Korea Institute of Science and Technology
, 39-1 Hawolgok-dong, Songbuk-gu, Seoul, Korea, 136-791
Tae Young Kim
Research Engineer
Maritime Research Institute
, Hyundai Heavy Industries Co. LTD, 1 Jeonha-dong, Dong-gu, Ulsan, Korea, 687-792
Kyong Ho Jeong
Principal Researcher
Rotating Machinery Group, Hwang Hae Electric, 679-1, Gojan-Dong, Namdong-Gu, Inchun Metropolitan City, Korea, 405-819
J. Eng. Gas Turbines Power. Feb 2012, 134(2): 022501 (7 pages)
Published Online: December 2, 2011
Article history
Received:
April 12, 2011
Revised:
April 19, 2011
Online:
December 2, 2011
Published:
December 2, 2011
Citation
Kim, T. H., Lee, Y., Kim, T. Y., and Jeong, K. H. (December 2, 2011). "Rotordynamic Performance of an Oil-Free Turbo Blower Focusing on Load Capacity of Gas Foil Thrust Bearings." ASME. J. Eng. Gas Turbines Power. February 2012; 134(2): 022501. https://doi.org/10.1115/1.4004143
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