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    Laser-Based Investigations of Periodic Combustion Instabilities in a Gas Turbine Model Combustor

    Source: Journal of Engineering for Gas Turbines and Power:;2005:;volume( 127 ):;issue: 003::page 492
    Author:
    R. Giezendanner
    ,
    B. Lehmann
    ,
    P. Weigand
    ,
    X. R. Duan
    ,
    W. Meier
    ,
    U. Meier
    ,
    M. Aigner
    DOI: 10.1115/1.1850498
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The driving mechanism of pulsations in gas turbine combustors depends on a complex interaction between flow field, chemistry, heat release, and acoustics. Experimental data on all these factors are therefore required to obtain insight into the coupling mechanisms during a pulsation period. In order to develop a comprehensive experimental database to support a phenomenological understanding and to provide validation data for numerical simulation, a standard burner for optical investigations was established that exhibits strong self-excited oscillations. The burner was a swirl-stabilized nonpremixed model combustor designed for gas turbine applications and operated using methane as fuel at atmospheric pressure. It was mounted in a combustion chamber, which provides almost unobstructed optical access. The periodic combustion instabilities were studied by a variety of phase-resolved laser-based diagnostic techniques, locked to the frequency of the dominant pressure oscillation. Measurement techniques used were LDV for velocity measurements, planar laser-induced fluorescence for imaging of CH and OH radicals, and laser Raman scattering for the determination of the major species concentrations, temperature, and mixture fraction. The phase-resolved measurements revealed significant variations of all measured quantities in the vicinity of the nozzle exit, which trailed off quickly with increasing distance. A strong correlation of the heat release rate and axial velocity at the nozzle was observed, while the mean mixture fraction as well as the temperature in the periphery of the flame is phase shifted with respect to axial velocity oscillations. A qualitative interpretation of the experimental observations is given, which will help to form a better understanding of the interaction between flow field, mixing, heat release, and temperature in pulsating reacting flows, particularly when accompanied by corresponding CFD simulations that are currently underway.
    keyword(s): Oscillations , Pressure , Flow (Dynamics) , Heat , Temperature , Combustion , Lasers , Measurement , Combustion chambers , Gas turbines , Nozzles , Flames , Acoustics , Fuels , Mixtures , Mechanisms AND Computer simulation ,
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      Laser-Based Investigations of Periodic Combustion Instabilities in a Gas Turbine Model Combustor

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    http://yetl.yabesh.ir/yetl1/handle/yetl/131758
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorR. Giezendanner
    contributor authorB. Lehmann
    contributor authorP. Weigand
    contributor authorX. R. Duan
    contributor authorW. Meier
    contributor authorU. Meier
    contributor authorM. Aigner
    date accessioned2017-05-09T00:16:05Z
    date available2017-05-09T00:16:05Z
    date copyrightJuly, 2005
    date issued2005
    identifier issn1528-8919
    identifier otherJETPEZ-26871#492_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/131758
    description abstractThe driving mechanism of pulsations in gas turbine combustors depends on a complex interaction between flow field, chemistry, heat release, and acoustics. Experimental data on all these factors are therefore required to obtain insight into the coupling mechanisms during a pulsation period. In order to develop a comprehensive experimental database to support a phenomenological understanding and to provide validation data for numerical simulation, a standard burner for optical investigations was established that exhibits strong self-excited oscillations. The burner was a swirl-stabilized nonpremixed model combustor designed for gas turbine applications and operated using methane as fuel at atmospheric pressure. It was mounted in a combustion chamber, which provides almost unobstructed optical access. The periodic combustion instabilities were studied by a variety of phase-resolved laser-based diagnostic techniques, locked to the frequency of the dominant pressure oscillation. Measurement techniques used were LDV for velocity measurements, planar laser-induced fluorescence for imaging of CH and OH radicals, and laser Raman scattering for the determination of the major species concentrations, temperature, and mixture fraction. The phase-resolved measurements revealed significant variations of all measured quantities in the vicinity of the nozzle exit, which trailed off quickly with increasing distance. A strong correlation of the heat release rate and axial velocity at the nozzle was observed, while the mean mixture fraction as well as the temperature in the periphery of the flame is phase shifted with respect to axial velocity oscillations. A qualitative interpretation of the experimental observations is given, which will help to form a better understanding of the interaction between flow field, mixing, heat release, and temperature in pulsating reacting flows, particularly when accompanied by corresponding CFD simulations that are currently underway.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLaser-Based Investigations of Periodic Combustion Instabilities in a Gas Turbine Model Combustor
    typeJournal Paper
    journal volume127
    journal issue3
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.1850498
    journal fristpage492
    journal lastpage496
    identifier eissn0742-4795
    keywordsOscillations
    keywordsPressure
    keywordsFlow (Dynamics)
    keywordsHeat
    keywordsTemperature
    keywordsCombustion
    keywordsLasers
    keywordsMeasurement
    keywordsCombustion chambers
    keywordsGas turbines
    keywordsNozzles
    keywordsFlames
    keywordsAcoustics
    keywordsFuels
    keywordsMixtures
    keywordsMechanisms AND Computer simulation
    treeJournal of Engineering for Gas Turbines and Power:;2005:;volume( 127 ):;issue: 003
    contenttypeFulltext
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