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Coupling between hydrodynamics, acoustics, and heat release in a self-excited unstable combustor.

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Titel: Coupling between hydrodynamics, acoustics, and heat release in a self-excited unstable combustor.
Autoren: Harvazinski, Matthew E., Cheng Huang, Sankaran, Venkateswaran, Feldman, Thomas W., Anderson, William E., Merkle, Charles L., Talley, Douglas G.
Quelle: Physics of Fluids; 2015, Vol. 27 Issue 4, p1-27, 27p
Schlagwörter: HYDRODYNAMICS, COMBUSTION chambers, GAS dynamics, NONLINEAR theories, LARGE eddy simulation models
Abstract: The unsteady gas dynamic field in a closed combustor is determined by the nonlinear interactions between chamber acoustics, hydrodynamics, and turbulent combustion that can energize these modes. These interactions are studied in detail using hybrid RANS/large eddy simulations (RANS = Reynolds Averaged Navier-Stokes) of a nonpremixed, high-pressure laboratory combustor that produces self-excited longitudinal instabilities. The main variable in the study is the relative acoustic length between the combustion chamber and the tube that injects oxidizer into the combustor. Assuming a half-wave (closed-closed) combustion chamber, the tube lengths approximately correspond to quarter-, 3/8-, and half-wave resonators that serve to vary the phasing between the acoustic modes in the tube and the combustion chamber. The simulation correctly predicts the relatively stable behavior measured with the shortest tube and the very unstable behavior measured with the intermediate tube. Unstable behavior is also predicted for the longest tube, a case for which bifurcated stability behavior was measured in the experiment. In the first (stable) configuration, fuel flows into the combustor uninterrupted, and heat release is spatially continuous with a flame that remains attached to the back step. In the second (unstable) configuration, a cyclic process is apparent comprising a disruption in the fuel flow, subsequent detachment of the flame from the back step, and accumulation of fuel in the recirculation zone that ignites upon arrival of a compression wave reflected from the downstream boundary of the combustion chamber. The third case (mixed stable/unstable) shares features with both of the other cases. The major difference between the two cases predicted to be unstable is that, in the intermediate length tube, a pressure wave reflection inside the tube pushes unburnt fuel behind the back step radially outward, leading to a post-coupled reignition mechanism, while in the case of the longest tube, the reignition is promoted by vortex convection and combustor-wall interaction. Other flow details indicated by the simulation include the relative phase between flow resonances in the tube and the combustor, increased mixing due to baroclinic torque, and the presence of an unsteady triple flame. [ABSTRACT FROM AUTHOR]
Copyright of Physics of Fluids is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Coupling between hydrodynamics, acoustics, and heat release in a self-excited unstable combustor.
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  Data: <searchLink fieldCode="AR" term="%22Harvazinski%2C+Matthew+E%2E%22">Harvazinski, Matthew E.</searchLink><br /><searchLink fieldCode="AR" term="%22Cheng+Huang%22">Cheng Huang</searchLink><br /><searchLink fieldCode="AR" term="%22Sankaran%2C+Venkateswaran%22">Sankaran, Venkateswaran</searchLink><br /><searchLink fieldCode="AR" term="%22Feldman%2C+Thomas+W%2E%22">Feldman, Thomas W.</searchLink><br /><searchLink fieldCode="AR" term="%22Anderson%2C+William+E%2E%22">Anderson, William E.</searchLink><br /><searchLink fieldCode="AR" term="%22Merkle%2C+Charles+L%2E%22">Merkle, Charles L.</searchLink><br /><searchLink fieldCode="AR" term="%22Talley%2C+Douglas+G%2E%22">Talley, Douglas G.</searchLink>
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  Data: Physics of Fluids; 2015, Vol. 27 Issue 4, p1-27, 27p
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  Data: <searchLink fieldCode="DE" term="%22HYDRODYNAMICS%22">HYDRODYNAMICS</searchLink><br /><searchLink fieldCode="DE" term="%22COMBUSTION+chambers%22">COMBUSTION chambers</searchLink><br /><searchLink fieldCode="DE" term="%22GAS+dynamics%22">GAS dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22NONLINEAR+theories%22">NONLINEAR theories</searchLink><br /><searchLink fieldCode="DE" term="%22LARGE+eddy+simulation+models%22">LARGE eddy simulation models</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The unsteady gas dynamic field in a closed combustor is determined by the nonlinear interactions between chamber acoustics, hydrodynamics, and turbulent combustion that can energize these modes. These interactions are studied in detail using hybrid RANS/large eddy simulations (RANS = Reynolds Averaged Navier-Stokes) of a nonpremixed, high-pressure laboratory combustor that produces self-excited longitudinal instabilities. The main variable in the study is the relative acoustic length between the combustion chamber and the tube that injects oxidizer into the combustor. Assuming a half-wave (closed-closed) combustion chamber, the tube lengths approximately correspond to quarter-, 3/8-, and half-wave resonators that serve to vary the phasing between the acoustic modes in the tube and the combustion chamber. The simulation correctly predicts the relatively stable behavior measured with the shortest tube and the very unstable behavior measured with the intermediate tube. Unstable behavior is also predicted for the longest tube, a case for which bifurcated stability behavior was measured in the experiment. In the first (stable) configuration, fuel flows into the combustor uninterrupted, and heat release is spatially continuous with a flame that remains attached to the back step. In the second (unstable) configuration, a cyclic process is apparent comprising a disruption in the fuel flow, subsequent detachment of the flame from the back step, and accumulation of fuel in the recirculation zone that ignites upon arrival of a compression wave reflected from the downstream boundary of the combustion chamber. The third case (mixed stable/unstable) shares features with both of the other cases. The major difference between the two cases predicted to be unstable is that, in the intermediate length tube, a pressure wave reflection inside the tube pushes unburnt fuel behind the back step radially outward, leading to a post-coupled reignition mechanism, while in the case of the longest tube, the reignition is promoted by vortex convection and combustor-wall interaction. Other flow details indicated by the simulation include the relative phase between flow resonances in the tube and the combustor, increased mixing due to baroclinic torque, and the presence of an unsteady triple flame. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Physics of Fluids is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1063/1.4916673
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 27
        StartPage: 1
    Subjects:
      – SubjectFull: HYDRODYNAMICS
        Type: general
      – SubjectFull: COMBUSTION chambers
        Type: general
      – SubjectFull: GAS dynamics
        Type: general
      – SubjectFull: NONLINEAR theories
        Type: general
      – SubjectFull: LARGE eddy simulation models
        Type: general
    Titles:
      – TitleFull: Coupling between hydrodynamics, acoustics, and heat release in a self-excited unstable combustor.
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            NameFull: Harvazinski, Matthew E.
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            NameFull: Cheng Huang
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            NameFull: Anderson, William E.
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              Text: 2015
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