Assessment of Flame Transfer Function Formulations for the Thermoacoustic Analysis of Lean Burn Aero-engine Combustors

Andreini, Antonio; Facchini, Bruno; Giusti, Andrea; Turrini, Fabio

doi:10.1016/j.egypro.2014.01.149

Cited by 14 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with FTFs for conventional combustion systems [49,50], an example of which is shown in Fig. 9, the gain for the hydrogen micromix FTF does not decrease significantly until a much higher frequency.…”

Section: Les Oh Fluctuationsmentioning

confidence: 93%

Comparison of Hydrogen Micromix Flame Transfer Functions Determined Using RANS and LES

McClure

Abbott

Agarwal

et al. 2019

Volume 3: Coal, Biomass, Hydrogen, and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration; Organ

View full text Add to dashboard Cite

Hydrogen has been proposed as an alternative fuel to meet long term emissions and sustainability targets, however due to the characteristics of hydrogen significant modifications to the combustion system are required. The micromix concept utilises a large number of miniaturised diffusion flames to improve mixing, removing the potential for local stoichiometric pockets, flash-back and autoignition. No publicly available studies have yet investigated the thermoacoustic stability of these combustion systems, however due to similarities with lean-premixed combustors which have suffered significant thermoacoustic issues, this risk should not be neglected. Two approaches have been investigated for estimating flame response to acoustic excitations of a single hydrogen micromix injector element. The first uses analytical expressions for the flame transfer function with constants obtained from RANS CFD while the second determines the flame transfer function directly using unsteady LES CFD. Results show the typical form of the flame transfer function but suggest micromix combustors may be more susceptible to higher frequency instabilities than conventional combustion systems. Additionally, the flame transfer function estimated using RANS CFD is broadly similar to that of the LES approach, therefore this may be suitable for use as a preliminary design tool due to its relatively low computational expense.

show abstract

Section: Les Oh Fluctuationsmentioning

confidence: 93%

Comparison of Hydrogen Micromix Flame Transfer Functions Determined Using RANS and LES

McClure

Abbott

Agarwal

et al. 2019

Volume 3: Coal, Biomass, Hydrogen, and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration; Organ

View full text Add to dashboard Cite

show abstract

“…8–10 The physical processes involved are very complex and not completely understood with very few investigations available in literature especially for the interaction between acoustics and droplet primary breakup. 11…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10] The physical processes involved are very complex and not completely understood with very few investigations available in literature especially for the interaction between acoustics and droplet primary breakup. 11 Commonly employed simplified FTF formulations are in many cases inadequate to represent the complex physics lying behind the flame dynamic response. Concerning liquid fuel FTFs, Eckstein and Sattelmayer (2006) proposed a formulation for diffusion flames generated by an airblast injection system.…”

Section: Introductionmentioning

confidence: 99%

“…In the study by Andreini et al, 11 the capabilities of different FTF formulations in reproducing the complex PERM generated flame were tested. The thermo-acoustic behaviour of the PERM equipped combustor has been shown to be strongly dependent on operating conditions, 14,15 and simple FTF formulations seem to be inadequate to study the thermo-acoustic stability at several operating conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical analysis of the dynamic flame response of a spray flame for aero-engine applications

Innocenti

Andreini

Facchini

et al. 2017

International Journal of Spray and Combustion Dynamics

Self Cite

View full text Add to dashboard Cite

Incoming standards on NO x emissions are motivating many aero-engine manufacturers to adopt the lean burn combustion concept. One of the most critical issues affecting this kind of technology is the occurrence of thermo-acoustic instabilities that may compromise combustor life and integrity. Therefore the prediction of the thermo-acoustic behaviour of the system becomes of primary importance. In this paper, the complex interaction between the system acoustics and a turbulent spray flame for aero-engine applications is numerically studied. The dynamic flame response is computed exploiting reactive URANS simulations and system identification techniques. Great attention has been devoted to the impact of liquid fuel evolution and droplet dynamics. For this purpose, the GE Avio PERM (partially evaporating and rapid mixing) lean injection system has been analysed, focussing attention on the effect of several modelling parameters on the combustion and on the predicted flame response. A frequency analysis has also been set up and exploited to obtain even more insight on the dynamic flame response of the spray flame. The application is one of the few in the literature where the dynamic flame response of spray flames is numerically investigated, providing a description in terms of flame transfer function and detailed information on the physical phenomena.

show abstract

“…7,8,16 Similar approach to the development of FTF in non-premixed flames can be found in the little literature available on the subject, but with distinct dynamics for heat release fluctuations from premixed flames. 15,17 Magina et al 18 reported that nonpremixed flames response to velocity perturbations is similar to those of premixed flames with differences arising from the dynamics of their respective integrated heat release. Subsequently, they reported that contrary to flame area fluctuations in premixed flames, the heat release dynamics in non-premixed flames is dominated by mass burning rate fluctuations.…”

mentioning

confidence: 98%

Thermoacoustic combustion instability of propane‐oxy‐combustion with CO₂dilution: Experimental analysis

Abubakar

Mokheimer

2019

Int J Energy Res

View full text Add to dashboard Cite

show abstract

Assessment of Flame Transfer Function Formulations for the Thermoacoustic Analysis of Lean Burn Aero-engine Combustors

Cited by 14 publications

References 28 publications

Comparison of Hydrogen Micromix Flame Transfer Functions Determined Using RANS and LES

Comparison of Hydrogen Micromix Flame Transfer Functions Determined Using RANS and LES

Numerical analysis of the dynamic flame response of a spray flame for aero-engine applications

Thermoacoustic combustion instability of propane‐oxy‐combustion with CO₂dilution: Experimental analysis

Contact Info

Product

Resources

About

Assessment of Flame Transfer Function Formulations for the Thermoacoustic Analysis of Lean Burn Aero-engine Combustors

Cited by 14 publications

References 28 publications

Comparison of Hydrogen Micromix Flame Transfer Functions Determined Using RANS and LES

Comparison of Hydrogen Micromix Flame Transfer Functions Determined Using RANS and LES

Numerical analysis of the dynamic flame response of a spray flame for aero-engine applications

Thermoacoustic combustion instability of propane‐oxy‐combustion with CO2dilution: Experimental analysis

Contact Info

Product

Resources

About

Thermoacoustic combustion instability of propane‐oxy‐combustion with CO₂dilution: Experimental analysis