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    A Test Facility for the Measurement of Torques at the Shaft to Seal Interface in Brush Seals

    Source: Journal of Engineering for Gas Turbines and Power:;1999:;volume( 121 ):;issue: 001::page 160
    Author:
    P. E. Wood
    ,
    T. V. Jones
    DOI: 10.1115/1.2816304
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: An important factor in the performance of brush seals for a wide range of gas turbine applications is the rate of wear at the seal to shaft interface, which is dependent on the contact pressure that exists between the bristles and rubbing surface. This is dependent on a variety of effects. Principally, these are the aerodynamic forces bending the bristles onto the rubbing surface, frictional effects within the bristle pack and at the backing ring that arise with the application of pressure differential, geometrical changes due to centrifugal and thermal growths, and transient differential movements of the rotor that develop in flight manoeuvres. In order to investigate the effect of these phenomena on contact pressure, a test facility has been devised in which the torque exerted by a brush seal on a rotating shaft is used as an indirect measurement of contact pressure. This has necessitated the design of a test facility in which all system torques can be fully calibrated. Consequently, a pressure balanced design has been adopted in which applied seal differential and pressure levels have a minimal effect on axial loads at the rotor bearing assembly. The primary method of torque measurement is the instantaneous deceleration of the rotor. Thus, measurements over a wide speed range are acquired with high frequency instrumentation. The means whereby small parasitic torques are evaluated and corrected is given. Results demonstrating the dependence of contact pressure on seal differential and pressure levels are presented.
    keyword(s): Test facilities , Pressure , Rotors , Design , Gas turbines , Instrumentation , Torque , Torque measurement , Flight , Aerodynamics , Wear , Measurement , Motion , Manufacturing , Stress AND Bearings ,
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      A Test Facility for the Measurement of Torques at the Shaft to Seal Interface in Brush Seals

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/122193
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorP. E. Wood
    contributor authorT. V. Jones
    date accessioned2017-05-08T23:59:44Z
    date available2017-05-08T23:59:44Z
    date copyrightJanuary, 1999
    date issued1999
    identifier issn1528-8919
    identifier otherJETPEZ-26786#160_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/122193
    description abstractAn important factor in the performance of brush seals for a wide range of gas turbine applications is the rate of wear at the seal to shaft interface, which is dependent on the contact pressure that exists between the bristles and rubbing surface. This is dependent on a variety of effects. Principally, these are the aerodynamic forces bending the bristles onto the rubbing surface, frictional effects within the bristle pack and at the backing ring that arise with the application of pressure differential, geometrical changes due to centrifugal and thermal growths, and transient differential movements of the rotor that develop in flight manoeuvres. In order to investigate the effect of these phenomena on contact pressure, a test facility has been devised in which the torque exerted by a brush seal on a rotating shaft is used as an indirect measurement of contact pressure. This has necessitated the design of a test facility in which all system torques can be fully calibrated. Consequently, a pressure balanced design has been adopted in which applied seal differential and pressure levels have a minimal effect on axial loads at the rotor bearing assembly. The primary method of torque measurement is the instantaneous deceleration of the rotor. Thus, measurements over a wide speed range are acquired with high frequency instrumentation. The means whereby small parasitic torques are evaluated and corrected is given. Results demonstrating the dependence of contact pressure on seal differential and pressure levels are presented.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Test Facility for the Measurement of Torques at the Shaft to Seal Interface in Brush Seals
    typeJournal Paper
    journal volume121
    journal issue1
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.2816304
    journal fristpage160
    journal lastpage166
    identifier eissn0742-4795
    keywordsTest facilities
    keywordsPressure
    keywordsRotors
    keywordsDesign
    keywordsGas turbines
    keywordsInstrumentation
    keywordsTorque
    keywordsTorque measurement
    keywordsFlight
    keywordsAerodynamics
    keywordsWear
    keywordsMeasurement
    keywordsMotion
    keywordsManufacturing
    keywordsStress AND Bearings
    treeJournal of Engineering for Gas Turbines and Power:;1999:;volume( 121 ):;issue: 001
    contenttypeFulltext
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