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    Rotor Active Clearance Control / Start Bleed

    Uploaded by

    ArabyAbdel Hamed Sadek
    This document discusses three active clearance control systems used in gas turbine engines: 1. Rotor active clearance control (RAC) uses heating to improve efficiency in the high pressure compressor by controlling tip clearances during cruise. 2. Start bleed (SB) provides stability for the high pressure compressor during starts and accelerations by controlling clearances. 3. High pressure turbine active clearance control (HPT ACC) and low pressure turbine active clearance control (LPT ACC) maximize efficiency and minimize temperatures by controlling blade and shroud clearances in the turbines.

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    © All Rights Reserved
    Download as PPS, PDF, TXT or read online from Scribd

    Rotor Active Clearance Control / Start Bleed

    Uploaded by

    ArabyAbdel Hamed Sadek
    17 views21 pages
    This document discusses three active clearance control systems used in gas turbine engines: 1. Rotor active clearance control (RAC) uses heating to improve efficiency in the high pressure compressor by controlling tip clearances during cruise. 2. Start bleed (SB) provides stability for the high pressure compressor during starts and accelerations by controlling clearances. 3. High pressure turbine active clearance control (HPT ACC) and low pressure turbine active clearance control (LPT ACC) maximize efficiency and minimize temperatures by controlling blade and shroud clearances in the turbines.

    Original Description:

    air system

    Original Title

    air2sys

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    This document discusses three active clearance control systems used in gas turbine engines: 1. Rotor active clearance control (RAC) uses heating to improve efficiency in the high pressure compressor by controlling tip clearances during cruise. 2. Start bleed (SB) provides stability for the high pressure compressor during starts and accelerations by controlling clearances. 3. High pressure turbine active clearance control (HPT ACC) and low pressure turbine active clearance control (LPT ACC) maximize efficiency and minimize temperatures by controlling blade and shroud clearances in the turbines.

    Copyright:

    © All Rights Reserved
    Download as PPS, PDF, TXT or read online from Scribd
    Download as pps, pdf, or txt
    17 views21 pages

    Rotor Active Clearance Control / Start Bleed

    Uploaded by

    ArabyAbdel Hamed Sadek
    This document discusses three active clearance control systems used in gas turbine engines: 1. Rotor active clearance control (RAC) uses heating to improve efficiency in the high pressure compressor by controlling tip clearances during cruise. 2. Start bleed (SB) provides stability for the high pressure compressor during starts and accelerations by controlling clearances. 3. High pressure turbine active clearance control (HPT ACC) and low pressure turbine active clearance control (LPT ACC) maximize efficiency and minimize temperatures by controlling blade and shroud clearances in the turbines.

    Copyright:

    © All Rights Reserved
    Download as PPS, PDF, TXT or read online from Scribd
    Download as pps, pdf, or txt
    of 21

    Rotor active clearance

    control / start bleed


    RAC heating HPC disks to
    Improve the HPC
    efficiency during
    cruise operation

    SB For HPC stability


    during engine start
    and rapid
    acceleration
    Located 7:30 o’clock ,HPC case
    RAC
    HPC 5th stage To HPC
    inner cavity

    ECU T/M

    HMU HPC 9th stage

    SB
    Piston position
    RAC SB

    100%

    62%

    27%

    5th 9th Air used


    Fail safe Fully
    position closed
    HPT active clearance
    control
    •Maximize turbine
    efficiency.

    HPT ACC •Minimize the peak


    EGT during throttle
    burst.
    •Reduce compressor
    load during starting
    and transient engine
    conditions

    By min. blade & shroud tip clearance.


    3:00 o’clock HPC case.
    HPC 9th stage
    m
    a
    n
    ECU T/M
    f
    i

    HMU HPC 4th stage


    o
    l
    d

    To HPT shroud
    Piston position

    100%

    95%

    40%

    37%

    4th 9th Air used


    LPT active clearance
    control
    •Controls LPT
    rotor to stator
    clearance
    LPT ACC
    •Protects the
    turbine case
    from over temp.
    4:30 on HPC case
    The butterfly valve determines the amount of fan discharge air
    entering the manifold and cooling tube assembly.
    Valve
    Fail safe modulated
    position (opened 30
    degrees)

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