Thermal versus acoustic response of velocity sensitive premixed flames

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

“…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. Such a model is developed for intrinsic thermoacoustic instability in premixed flames using the low-order network models approach.…”

“…Such a model is developed for intrinsic thermoacoustic instability in premixed flames using the low-order network models approach. 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, the CO 2 in the combustion products can be captured and sequestered after it is separated from the water vapor by condensation. 7,8 Therefore, thermoacoustic instability can occur even in an anechoic medium via flame intrinsic modes. Consequently, some of the fundamental technical challenges associated with oxyfuel combustion involve system operation, heat transfer considerations, and combustion stability.…”

“…6 Furthermore, while heat release fluctuations can excite the natural acoustic modes of a combustor (the combustor acoustic eigenmodes) leading to instabilities, thermoacoustic instability can also result intrinsically from the positive feedback between the flame and acoustic quantities. 7,8 Therefore, thermoacoustic instability can occur even in an anechoic medium via flame intrinsic modes. 9 An amplifying pressure oscillation due to thermoacoustic instability can be among the factors leading to flame blowout similar to mixing and chemical time scales, and extinction strain rates.…”

Prediction of combustion instability limit cycle oscillations by combining flame describing function simulations with a thermoacoustic network model

“…It provides predictions of the frequencies of resonant modes, their stability (positive and negative growth rates), mode shapes and the time evolution of disturbances. The fundamental basis of OSCILOS is similar to other thermoacoustic network models [2,12,26,35,93,94], which have been validated and used extensively in a variety of thermoacoustic problems [2,12,35,40,41].…”