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Research Papers: Gas Turbines: Structures and Dynamics

Effect of Circumferential Location of Radial Injection on Rotordynamic Performance of Hybrid Air Foil Bearings

[+] Author and Article Information
Behzad Zamanian Yazdi

Energy Recovery Inc.,
San Leandro, CA 94577
e-mail: bzamanian@energyrecovery.com

Daejong Kim

Department of Mechanical
and Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019
e-mail: daejongkim@uta.edu

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 1, 2018; final manuscript received September 3, 2018; published online October 23, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 140(12), 122504 (Oct 23, 2018) (10 pages) Paper No: GTP-18-1538; doi: 10.1115/1.4041646 History: Received August 01, 2018; Revised September 03, 2018

Air foil bearings (AFBs) are introduced as promising bearings for oil-free turbomachinery applications. AFBs provide reliable operation at high speed and high temperature with negligible power loss. Hybrid air foil bearing (HAFB) technology utilizes the radial injection of externally pressurized air into the traditional hydrodynamic AFB's film thickness through orifices attached to the top foil. Previous studies have reported enhancement in the rotordynamic stability of HAFBs compared to traditional hydrodynamic AFBs. HAFBs have several orifices distributed in the circumferential direction. In this study, the effect of the circumferential location of radial injection on the rotordynamic performance of the rotor-HAFB is studied. Analytical and experimental evaluations of the rotordynamic performance of a rotor supported by two single-pad HAFBs are presented. Parametric studies are conducted using three sets of single-pad HAFBs. The circumferential locations of orifices are different for each set. The presented simulation analyses consist of time-domain orbit simulation and frequency-domain modal analysis. Imbalance responses of rotor-HAFB were measured with various orifice locations and the results agree well with predictions. Comparison of the rotordynamic performance of HAFBs with different orifice configurations demonstrates substantial improvement in rotordynamic stability as well as enhancement in the stiffness and damping coefficients of HAFBs by choosing the best circumferential location for radial injection to control rotor eccentricity and attitude angle.

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Figures

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Fig. 1

Schematic of single-pad HAFB

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Fig. 3

Cross section view of the rotordynamic test rig

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Fig. 4

Rotor-bearing configuration and the coordinate system

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Fig. 5

Global and local axial coordinate configuration

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Fig. 18

Modal impedances for forward whir motion of cylindrical mode (real and imaginary parts of modal impedance) for cylindrical mode versus excitation frequency ratio at 40,000 rpm

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Fig. 17

Rotor eccentricity and attitude angle

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Fig. 16

Predicted peak–peak synchronous imbalance response of rotor for controlled hybrid operation without-phase imbalance

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Fig. 15

Predicted peak–peak synchronous imbalance response of rotor for controlled hybrid operation with in-phase imbalance

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Fig. 14

Predicted peak-peak imbalance response of case-2 HAFB under different imbalance masses versus measured imbalance response, controlled hybrid operation—X direction

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Fig. 13

Effect of imbalance mass on predicted imbalance of case-2 HAFB (controlled hybrid operation), at 30,000 rpm

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Fig. 12

Effect of loss factor and excitation frequency on predicted imbalance response of case-2 HAFB (controlled hybrid operation), at 30,000 rpm

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Fig. 11

Imbalance response of the rotor supported by case-2 HAFB (controlled hybrid operation) at 31,800 rpm

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Fig. 10

Measured imbalance response for case-2 HAFB (X-direction): (a) full hybrid operation and (b) controlled hybrid operation

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Fig. 9

Measured imbalance response for case-1 HAFB (X-direction): (a) full hybrid operation and (b) controlled hybrid operation

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Fig. 8

Predicted waterfall plots for the case-3 HAFB (X-direction): (a) full hybrid operation and (b) controlled hybrid operation

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Fig. 7

Predicted waterfall plots for the case-2 HAFB (X-direction): (a) full hybrid operation and (b) controlled hybrid operation

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Fig. 6

Predicted waterfall plots for the case-1 HAFB (X-direction): (a) full hybrid operation and (b) controlled hybrid operation

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