Gas Turbine Single Annular Combustor Sector:  Combustion Dynamics

Ichihashi, Fumitaka; Mohammad, Bassam; Tambe, Samir B.; Kao, Yi-Huan; Jeng, San‐Mou

doi:10.2514/6.2010-21

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…Bade et al, 6 Stadlmair and Sattelmayer, 7 de Rosa et al 8 ) the quantitative determination of the systems thermoacoustic response, for example, captured as flame-transfer-matrix (FTM) or flame-transfer-function (FTF) was not possible. The more recent results from Cai et al 9 support the conjecture that the thermoacoustic behavior of the lean combustion zone plays a decisive role for the overall combustion dynamics of RQL burners. Cai et al 9 was able to identify different instabilities depending on the operational mode of his RQL combustor segment.…”

Section: Introductionmentioning

confidence: 75%

“…The more recent results from Cai et al 9 support the conjecture that the thermoacoustic behavior of the lean combustion zone plays a decisive role for the overall combustion dynamics of RQL burners. Cai et al 9 was able to identify different instabilities depending on the operational mode of his RQL combustor segment. Using natural gas as fuel and operating under ambient pressure Cai et al 9 used chemiluminescence (CL) heat release images and dynamic pressure measurements inside the chamber.…”

Section: Introductionmentioning

confidence: 75%

“…Cai et al 9 was able to identify different instabilities depending on the operational mode of his RQL combustor segment. Using natural gas as fuel and operating under ambient pressure Cai et al 9 used chemiluminescence (CL) heat release images and dynamic pressure measurements inside the chamber. As a result they showed a correlation between the acoustic emissions during the RQL operation mode and the interaction of the fuel-rich mixture with the secondary air jets, but their dynamics could not be quantified in an FTF.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flame Transfer Functions of the Lean Burnout Zone of an RQL Combustion Chamber - Dynamic Response to Primary Zone and Mixing Port Velocity Fluctuations

Renner

March

et al. 2023

International Journal of Spray and Combustion Dynamics

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This article describes an experimental investigation of thermoacoustic flame transfer functions of the lean burnout zone of an rich–quench–lean combustion chamber. With spatial separation of the rich primary from the lean secondary dilution zone, the latter is independently examined. The multi-microphone-method was employed to characterize the combustor acoustic velocity response to acoustic forcing coming from the primary zone and the mixing ports. The lean secondary zone is then treated as a pure acoustic 3-port network element connected to a 2-port Rankine-Hugoniot flame element. Focusing only on heat release fluctuations due to velocity fluctuations, the former are described by two linear superimposed flame transfer functions as a function of the velocity fluctuations coming from the primary zone and the mixing ports, respectively. Based on a non-reacting and a reacting measurement the two flame transfer functions could be extracted from the experimental data. Within this research, flame transfer functions from the new acoustical approach are presented and compared with ones measured using chemiluminescence and a photomultiplier tube. It is found that the inverse diffusion flame in the burnout zone reacts to velocity fluctuations from the primary zone in the low frequency range and a clear low pass behavior is observed. The mixing port velocity fluctuations create a more broadband response. In the presented cases, the flame transfer functions calculated from chemiluminescence match those from the acoustic method very well.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flame Transfer Functions of the Lean Burnout Zone of an RQL Combustion Chamber - Dynamic Response to Primary Zone and Mixing Port Velocity Fluctuations

Renner

March

et al. 2023

International Journal of Spray and Combustion Dynamics

View full text Add to dashboard Cite

show abstract

“…Using chemiluminescence heat release images and dynamic pressure measurements inside the chamber, a correlation of the acoustic emissions in the RQL operation mode and the interaction of the fuel-rich mixture from the rich zone with the secondary air jets was shown. Cai et al 8 could not quantify these dynamics in an FTF.…”

Section: Introductionmentioning

confidence: 98%

“…However, it is conceivable that the thermoacoustic behavior of the lean combustion zone plays a decisive role for the overall combustion dynamics of RQL combustors. Cai et al 8 investigated the dynamics of an RQL combustor segment operating at ambient pressure with natural gas. They identified instabilities in the lean and the RQL operation mode.…”

Section: Introductionmentioning

confidence: 99%

Flame dynamics in the lean burnout zone of an RQL combustion chamber - response to primary zone velocity fluctuations

Renner

March

Hirsch

et al. 2022

International Journal of Spray and Combustion Dynamics

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This study focuses on elucidating the flame dynamics of the lean burnout zone of an Rich-Quench-Lean (RQL) combustion chamber. With a new experimental approach of spatially separating the rich primary zone from the lean burnout zone, the latter can be investigated independently in terms of velocity fluctuations. Acoustically stiff mixing air ports in the lean burnout zone are ensured to prevent any acoustic interaction of the primary crossflow with the secondary mixing air jets. Therefore, defined boundary conditions at the mixing air inlets are used. Resulting no thermoacoustic interaction and additional flame dynamics are generated. In this specific case the lean burnout zone can be treated as a 2-port system allowing the application of existing evaluation methods e.g. acoustic determination of flame-transfer-functions (FTF) from the Rankine-Hugoniot (RH) equation or quantification of the heat release with chemiluminescence in combination with the Multi-Microphone-Method (MMM). Within this research, FTFs acoustically measured with the RH approach are presented and serve as a baseline for comparison with ones measured via a photomultiplier tube (PMT). It is found that the inverse diffusion flame in the burnout zone only reacts to fluctuations in the low frequency range and a clear low pass behavior is observed. The FTFs, calculated via the PMT match those from RH very well. Amplitude weighted phase images, recorded with a high-speed camera setup, visualize changes during excitation which complement and confirm the findings from the FTF.

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Large-eddy simulation and linear acoustic modeling of entropy mode oscillations in a model combustor with coolant injection

Zhang

2018

Chinese Journal of Aeronautics

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Gas Turbine Single Annular Combustor Sector: Combustion Dynamics

Cited by 10 publications

References 5 publications

Flame Transfer Functions of the Lean Burnout Zone of an RQL Combustion Chamber - Dynamic Response to Primary Zone and Mixing Port Velocity Fluctuations

Flame Transfer Functions of the Lean Burnout Zone of an RQL Combustion Chamber - Dynamic Response to Primary Zone and Mixing Port Velocity Fluctuations

Flame dynamics in the lean burnout zone of an RQL combustion chamber - response to primary zone velocity fluctuations

Large-eddy simulation and linear acoustic modeling of entropy mode oscillations in a model combustor with coolant injection

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