Measurement and Analysis of Flame Transfer Functions in a Lean-Premixed, Swirl-Stabilized Combustor with Water Injection

Stadlmair, Nicolai V.; Sattelmayer, Thomas

doi:10.2514/6.2016-1157

Cited by 9 publications

(7 citation statements)

References 17 publications

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“…Following the well established method for 2-port elements (e.g. Bade et al, 6 Stadlmair and Sattelmayer, 7 de Rosa et al, 8 Kaufmann et al 17 ) the dynamic flame response is often quantified with a FTF. In the case of velocity coupled flame response, the definition of the FTF is given as the normalized heat release fluctuation Q ˙ ′ / Q ˙ ¯ divided by a normalized reference velocity fluctuation u r e f ′ / u false¯ r e f.…”

Section: The Lean Secondary Zone As a Thermoacoustic 3-portmentioning

confidence: 99%

“…Missing the possibility of downstream acoustic excitation (only available in later studies e.g. 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.…”

Section: Introductionmentioning

confidence: 99%

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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: The Lean Secondary Zone As a Thermoacoustic 3-portmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…In the well established method for 2-port elements (e.g. [5][6][7]12 ) the dynamics of flames are represented using linearized Rankine-Hugoniot (RH) relations into which the specific flame dynamics enter as the flame transfer function (FTF) forming a 2 x 2 complex flame transfer matrix (FTM). Together with the 2-port burner transfer matrix (BTM) this allows representation of the dynamics of the burner and flame as an effective 2-port system, the burner flame transfer matrix.…”

Section: Thermoacoustic Theory Of Rql Combustorsmentioning

confidence: 99%

“…In the well established method for 2-port elements (e.g. 5–7,12 ) the dynamics of flames are represented using linearized Rankine-Hugoniot (RH) relations into which the specific flame dynamics enter as the flame transfer function (FTF) forming a 2 0.25em x 0.25em 2 complex flame transfer matrix (FTM). Together with the 2-port burner transfer matrix (BTM) this allows representation of the dynamics of the burner and flame as an effective 2-port system, the burner flame transfer matrix. For the identification of the BTM (without flame) and the BFTM (with flame) acoustic forcing of the upstream and downstream port is used together with the Multi-Microphone-Method (MMM) to determine the acoustic variables at these stations.…”

Section: Thermoacoustic Theory Of Rql Combustorsmentioning

confidence: 99%

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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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Dynamic Response of a Forced Low-Swirl Premixed Flame with Acoustic Excitation

Liu

Xue

Zhang

et al. 2021

Flow Turbulence Combust

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Measurement and Analysis of Flame Transfer Functions in a Lean-Premixed, Swirl-Stabilized Combustor with Water Injection

Cited by 9 publications

References 17 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

Dynamic Response of a Forced Low-Swirl Premixed Flame with Acoustic Excitation

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