Interaction between coherent flow oscillations and the premixed flame sheet in combustors can result in coherent unsteadiness in the global heat release response. These coherent flow oscillations can either be self-excited (e.g., the precessing vortex core) or result from the hydrodynamic response of the flow field to acoustic forcing. Recent work has focused on understanding the various instability modes and fundamental mechanisms that control hydrodynamic instability in single nozzle swirl flows. However, the effect of multiple closely spaced nozzles as well as the nonaxisymmetric nature of the confinement imposed by the combustor liner on swirl nozzle flows remains as yet unexplored. We study the influence of internozzle spacing and nonaxisymmetric confinement on the local temporal and spatiotemporal stability characteristics of multinozzle flows in this paper. The base flow model for the multinozzle case is constructed by superposing contributions from a base flow model for each individual nozzle. The influence of the flame is captured by specifying a spatially varying base flow density field. The nonaxisymmetric local stability problem is posed in terms of a parallel base flow with spatial variations in the two directions perpendicular to the streamwise direction. We investigate the case of a single nozzle and three nozzles arranged in a straight line within a rectangular combustor. The results show that geometric confinement imposed by the combustor walls has a quantitative impact on the eigenvalues of the hydrodynamic modes. Decreasing nozzle spacing for a given geometric confinement configuration makes the flow more unstable. The presence of an inner shear layer (ISL) stabilized flame results in an overall stabilization of the flow instability. We also discuss qualitatively, the underlying vorticity dynamics mechanisms that influence the characteristics of instability modes in triple nozzle flows.
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February 2019
Research-Article
Influence of Nonaxisymmetric Confinement on the Hydrodynamic Stability of Multinozzle Swirl Flows
Harish G. Subramanian,
Harish G. Subramanian
Department of Aerospace Engineering,
Indian Institute of Science,
Bangalore 560012, India
e-mail: gsubramanian@iisc.ac.in
Indian Institute of Science,
Bangalore 560012, India
e-mail: gsubramanian@iisc.ac.in
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Kiran Manoharan,
Kiran Manoharan
Department of Aerospace Engineering,
Indian Institute of Science,
Bangalore 560012, India
Indian Institute of Science,
Bangalore 560012, India
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Santosh Hemchandra
Santosh Hemchandra
Department of Aerospace Engineering,
Indian Institute of Science,
Bangalore 560012, India
Indian Institute of Science,
Bangalore 560012, India
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Harish G. Subramanian
Department of Aerospace Engineering,
Indian Institute of Science,
Bangalore 560012, India
e-mail: gsubramanian@iisc.ac.in
Indian Institute of Science,
Bangalore 560012, India
e-mail: gsubramanian@iisc.ac.in
Kiran Manoharan
Department of Aerospace Engineering,
Indian Institute of Science,
Bangalore 560012, India
Indian Institute of Science,
Bangalore 560012, India
Santosh Hemchandra
Department of Aerospace Engineering,
Indian Institute of Science,
Bangalore 560012, India
Indian Institute of Science,
Bangalore 560012, India
1Corresponding author.
Manuscript received June 30, 2018; final manuscript received July 15, 2018; published online October 4, 2018. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Feb 2019, 141(2): 021016 (11 pages)
Published Online: October 4, 2018
Article history
Received:
June 30, 2018
Revised:
July 15, 2018
Citation
Subramanian, H. G., Manoharan, K., and Hemchandra, S. (October 4, 2018). "Influence of Nonaxisymmetric Confinement on the Hydrodynamic Stability of Multinozzle Swirl Flows." ASME. J. Eng. Gas Turbines Power. February 2019; 141(2): 021016. https://doi.org/10.1115/1.4041080
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