Air foil bearing (AFB) technology has made substantial advancement during the past decades and found its applications in various small turbomachinery. However, rotordynamic instability, friction and drag during the start/stop, and thermal management are still challenges for further application of the technology. Hybrid air foil bearing (HAFB), utilizing hydrostatic injection of externally pressurized air into the bearing clearance, is one of the technology advancements to the conventional AFB. Previous studies on HAFBs demonstrate the enhancement in the load capacity at low speeds, reduction or elimination of the friction and wear during starts/stops, and enhanced heat dissipation capability. In this paper, the benefit of the HAFB is further explored to enhance the rotordynamic stability by employing a controlled hydrostatic injection. This paper presents the analytical and experimental evaluation of the rotordynamic performance of a rotor supported by two three-pad HAFBs with the controlled hydrostatic injection, which utilizes the injections at particular locations to control eccentricity and attitude angle. The simulations in both time domain orbit simulations and frequency-domain modal analyses indicate a substantial improvement of the rotor-bearing performance. The simulation results were verified in a high-speed test rig (maximum speed of 70,000 rpm). Experimental results agree with simulations in suppressing the subsynchronous vibrations but with a large discrepancy in the magnitude of the subsynchronous vibrations, which is a result of the limitation of the current modeling approach. However, both simulations and experiments clearly demonstrate the effectiveness of the controlled hydrostatic injection on improving the rotordynamic performance of AFB.
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January 2018
Research-Article
Rotordynamic Performance of Hybrid Air Foil Bearings With Regulated Hydrostatic Injection
Behzad Zamanian Yazdi,
Behzad Zamanian Yazdi
Turbomachinery and Energy System Laboratory,
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019;
Energy Recovery,
San Leandro, CA 94577
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019;
Energy Recovery,
San Leandro, CA 94577
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Daejong Kim
Daejong Kim
Turbomachinery and Energy System Laboratory,
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019
Search for other works by this author on:
Behzad Zamanian Yazdi
Turbomachinery and Energy System Laboratory,
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019;
Energy Recovery,
San Leandro, CA 94577
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019;
Energy Recovery,
San Leandro, CA 94577
Daejong Kim
Turbomachinery and Energy System Laboratory,
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019
Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 4, 2017; final manuscript received July 15, 2017; published online September 19, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Jan 2018, 140(1): 012506 (8 pages)
Published Online: September 19, 2017
Article history
Received:
July 4, 2017
Revised:
July 15, 2017
Citation
Yazdi, B. Z., and Kim, D. (September 19, 2017). "Rotordynamic Performance of Hybrid Air Foil Bearings With Regulated Hydrostatic Injection." ASME. J. Eng. Gas Turbines Power. January 2018; 140(1): 012506. https://doi.org/10.1115/1.4037667
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