Analysis of the dynamic response of premixed flames through chemiluminescence cross-correlation maps

Luciano, Ennio; Ballester, Javier

doi:10.1016/j.combustflame.2018.05.005

Cited by 17 publications

(5 citation statements)

References 33 publications

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“…Studies of laminar premixed V-flame forced with high frequency [17] have shown that the acoustic transverse standing wave response depends on the acoustic condition, having two response patterns; pairing process where multiplevortex interact in the jet outer layer, or a helical mode in the inner layer behind the rod. Analyses of the dynamic response of premixed flames have also been experimentally performed with chemiluminescence cross-correlation maps [18,19]. Moreover, results [18] have shown consistency with physical interpretation proposed for the crosscorrelation maps, confirming its potential for diagnosing the effective contribution of different flame regions to the global dynamic response.…”

Section: Introductionmentioning

confidence: 52%

“…Analyses of the dynamic response of premixed flames have also been experimentally performed with chemiluminescence cross-correlation maps [18,19]. Moreover, results [18] have shown consistency with physical interpretation proposed for the crosscorrelation maps, confirming its potential for diagnosing the effective contribution of different flame regions to the global dynamic response. The dynamics of the flame leading edge in a laminar premixed flame stabilized on a bluff body in a channel have been described also [19].…”

Section: Introductionmentioning

confidence: 52%

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Modelling of pulsating inverted conical flames: a numerical instability analysis

Ramos

Silva

Meglio

et al. 2021

Combustion Theory and Modelling

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The study of combustion-thermoacoustic instabilities is a topic of interest in the development of engines. However, the modeling of these systems involves a high computational burden. This paper focuses on a simpler class of systems that still features such instabilities: inverted conical flames anchored on a central bluff-body. Here these flames are modeled by solving species mass momentum and energy transport equations, coupled with a skeletal methane/air chemical kinetic mechanism. The aim is to characterize the dynamic behavior of inverted conical flames, both due to their natural dynamics and to external incoming velocity fluctuations. The main contribution is the detailed model of the flames, including the smallest scales. The analysis of the impact of the mesh adaption on the flame response shows a trade-off between model accuracy and computational burden that can be adjusted by changing the temperature gradient threshold. The flame response analysis in terms of the temperature and OH mass fraction gives a detailed characterization of the flame front behavior in its different scales, both in time and space. The analysis of the flame front dynamic response employing FFT shows that these have a natural frequency of 35 Hz, and this frequency interacts with the flame response due to incoming velocity excitations. More specifically, when forcing the flame with low frequencies (f ≤ 125 Hz) the flame responds only to the forcing and some harmonics, whereas when forcing between 125 < f ≤ 172 Hz the flame response comprises both the natural and forced behavior. Forcing beyond 200 Hz shows the natural flame response only. KEYWORDSlaminar premixed flame; thermo-acoustic instability; flame transfer function; flame frequency response; computational fluid dynamics CONTACT L. da Costa Ramos.

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Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 52%

Modelling of pulsating inverted conical flames: a numerical instability analysis

Ramos

Silva

Meglio

et al. 2021

Combustion Theory and Modelling

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“…In practice, of considerable interest is methane combustion in an air stream, which is realized in the diffusion mode [3][4][5][6][7][8] . This mode is mainly realized at application of burner devices of different types.…”

Section: Introductionmentioning

confidence: 99%

The influence of acoustic waves on the methane combustion process

Agafontsev,

Loboda,

Reyno

2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The paper presents the results of studies of diffusion combustion of gaseous methane in the presence of external pressure pulsations with low amplitude on the flame plume. The analysis of the temperature field and the stabilization time of the combustion mode has been carried out. It is established that the presence of pressure pulsations leads to characteristic changes in the temperature field, which are expressed by a growth of the temperature pulsation amplitude, corresponding to the frequency of external influences. A characteristic time for stabilizing the combustion regime from the moment when there is no external influence to their appearance is determined.

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“…In addition, the effect of acoustic oscillations leads to changes in the ranges of stable combustion of the air-methane mixture. Most of the works devoted to the effect of acoustic oscillations on methane combustion consider the fuel mixture as pre-stirred [10,11]. Also, one of the possible formulations of the problem is the location of the source of acoustic oscillations.…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of external pressure pulsations on the flame

Agafontsev

Loboda

Reyno

2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The paper examines the effect of low-amplitude pressure pulsations on the temperature field in the flame formed during methane combustion. Using the Ansys Fluent solver, the fields of temperature, velocity, and other flow characteristics in the presence of internal pressure pulsations were analyzed. As a result of the analysis of the obtained data, qualitative estimates of the effect of pressure pulsations on the flame plume were obtained. It is shown that the effect of acoustic oscillations on the flame plume leads to a change in the rate of combustion of fuel.Combustion, acoustic vibration, mathematical modeling, temperature, pulsations.

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Analysis of the dynamic response of premixed flames through chemiluminescence cross-correlation maps

Cited by 17 publications

References 33 publications

Modelling of pulsating inverted conical flames: a numerical instability analysis

Modelling of pulsating inverted conical flames: a numerical instability analysis

The influence of acoustic waves on the methane combustion process

Study of the effect of external pressure pulsations on the flame

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