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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Time Domain Simulation of Combustion Instabilities in Annular Combustors

[+] Author and Article Information
C. Pankiewitz, T. Sattelmayer

Lehrstuhl für Thermodynamik, Technische Universität München, 85747 Garching, Germany

J. Eng. Gas Turbines Power 125(3), 677-685 (Aug 15, 2003) (9 pages) doi:10.1115/1.1582496 History: Received December 01, 2001; Revised March 01, 2002; Online August 15, 2003
Copyright © 2003 by ASME
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References

Figures

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Annular combustor test rig representing the basis for the model combustor. (1) Premixing section, (2) plenum chamber, (3) combustion chamber, (4) exhaust.
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Geometry of the model annular combustor (cross section) with (1) inlet, (2) plenum chamber, (3) burner section, (4) combustion chamber, and (5) exit
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Shape of the function f(u) defined by Eq. (15)
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First four acoustical eigenmodes of the combustor (normalized pressure distribution)
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FEM mesh and initial distribution of pressure fluctuation p
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Time evolution of a self-excited instability for τ=1.9, ω0=5, no mean flow
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Normalized pressure distribution at different phase angles for one period of the limit cycle for τ=1.9, ω0=5, no mean flow
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Fluctuation of burner exit velocity (–), pressure ([[ellipsis]]), and heat release rate ([[dashed_line]]) during the limit cycle for τ=1.9, ω0=5, no mean flow
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Normalized frequency spectrum of the limit cycle oscillation for τ=1.9, ω0=5, no mean flow
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Time evolution of a self-excited instability in a system without losses (τ=1.0, ω0=5, no mean flow)
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Time evolution of the velocity fluctuation at one burner for τ=1.5, ω0=5, no mean flow
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Cycle increments for different delay times and ω0=5 (•), ω0=4 (▵), ω0=3 (▿), no mean flow
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Frequencies and corresponding mode types for different delay times. (•) Unstable mode, (○) stable mode. Acoustical eigenfrequencies of the (1,0,0)-mode ([[dashed_line]]) and (1,1,0)-mode (-⋅-)
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Normalized pressure distribution at different phase angles for one period of the limit cycle for τ=1.9, ω0=5, with mean flow
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Amplitudes of the burner exit velocity fluctuations for the cases without (•) and with (▵) mean flow (τ=1.9, ω0=5). Limit for onset of saturation ([[dashed_line]]).

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