Research Papers: Hydrodynamic Lubrication

Experimental Analysis of the Start-Up Torque of a Mildly Loaded Foil Thrust Bearing1

[+] Author and Article Information
Mihaï Arghir

Institut Pprime,
Université de Poitiers,
CNES, 11 Boulevard Marie et Pierre Curie,
Futuroscope-Chasseneuil, 86962, France

Romain Gauthier

SNECMA Moteurs Spatiaux,
Forêt de Vernon,
BP 802,
Vernon Cedex, 27208, France

Emelyne Renard

52 rue Jacques Hillairet,
Paris Cedex, 75612, France

An abstract of this paper was submitted to the ASME/STLE International Joint Tribology Conference, Denver, CO, October 2012.

The temperature rise from dry rubbing in mixed lubrication regime is three times larger than the increase from fluid shear in hydrodynamic regime.

The effect of conditioning could not be responsible for this improvement because temperatures showed a net decrease immediately after machining the passive ventilation orifices.

As one of the reviewers pointed out, this corresponds to 1 frame/rev at 15 krpm so it “integrates” several revolutions and somewhat limits the frequency response results.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received September 27, 2012; final manuscript received March 29, 2013; published online May 2, 2013. Assoc. Editor: Daniel Nélias.

J. Tribol 135(3), 031702 (May 02, 2013) (7 pages) Paper No: TRIB-12-1162; doi: 10.1115/1.4024211 History: Received September 27, 2012; Revised March 29, 2013

The paper deals with the experimental analysis of the torque and of the lift-off velocity of a foil thrust bearing. The geometric characteristics of the foil thrust bearing follow the design recently proposed by Dykas et al. (2009, “Design, Fabrication, and Performance of Foil Gas Thrust Bearings for Microturbomachinery Applications,” ASME J. Eng. Gas Turbines Power, 131(1), p. 012301-1). A dedicated test rig was developed and enables the measurement of the speed, the torque, and temperatures under the foils. The measurements underlined the importance of managing heat transfer in a foil thrust bearing. Results are presented for mild static loads ranging from 5 to 60 N and rotation speeds comprised between 20 and 35 krpm. The value of the start-up torque was validated by comparisons with results obtained with a rapid camera.

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Fig. 1

Front view and side view of the tested FTB

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Fig. 2

Geometry of the FTB and of its foils [15]

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Fig. 3

Test rig for stiffness measurements

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Fig. 4

Static stiffness of the thrust foil bearing

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Fig. 5

Test rig for start-up measurement

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Fig. 6

Thermocouple location in the bump foil structure of one pad

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Fig. 7

Schematic view of the torque measurement setup

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Fig. 8

Measurement of torque on the test rig

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Fig. 9

Torque and dimensionless temperatures for a velocity ramp (35 krpm and 15 N static load)

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Fig. 10

Air inlets for thermal regulation

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Fig. 11

Torque and dimensionless temperature variation after machining the venting orifices (35 krpm, 15 N)

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Fig. 12

Dimensionless torque versus static load

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Fig. 13

Dimensionless fluid film torque versus rotation speed for various loads (−1: 5 N, −2: 10 N, −3: 15 N, −4: 25 N, −5: 35 N, −6: 45 N, −7: 60 N)

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Fig. 14

Dimensionless lift-off/landing speed versus rotation speed for various loads (−1: 5 N, −2: 10 N, −3: 15 N, −4: 25 N, −5: 35 N, −6: 45 N, −7: 60 N)

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Fig. 15

Schematic view of the rapid camera setup

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Fig. 16

Example of measured displacement by the rapid camera

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Fig. 17

Torque result of 35 krpm - 15 N rapid camera measurement



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