Active suppression of swirl-stabilized combustion instability

Liu, Yunpeng; Li, Jinghua; Zhang, Tianhong; Yan, Yan

doi:10.1016/j.fuel.2020.119559

Cited by 14 publications

(2 citation statements)

References 37 publications

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“…However, nonlinear effects such as hysteresis in the regulation process can lead to failure. For example, refs – report experimental studies on active control of thermoacoustic instability. They often use the “trial and error” method to select the appropriate phase to reduce thermoacoustic instability.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Combustion Instability of Methane–Air Premixed Swirling Flame Based on OH-PLIF Measurements

et al. 2023

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A method for determining combustion instability using flame structure parameters is presented. A speaker is used to provide controllable external excitation for the combustion system. The experimental object is a methane−air swirl premixed flame. The flame structure parameters such as height, width, and flame surface density extracted from the hydroxyl planar laser-induced fluorescence image were used to analyze combustion instability at different equivalence ratios (0.8−1.2) and inlet flow rates. It is confirmed that the inflection point of the flame structure parameters corresponds to the evolution of combustion instability verified by the flame transfer function. The results show that with the increase of inlet velocity v, the flame aspect ratio h/b, average OH* concentration, and surface density Σ gradually decrease. The thickness δ of the flame brush shows an increasing trend under the same conditions. With the increase of equivalence ratio Φ, the average OH* concentration and flame surface density Σ increase continuously. The changing trend of flame brush thickness decreases first and then increases to a peak. Finally, it continues to decline after reaching the peak. The flame responds strongly to the sound field when the equivalence ratio is 0.9 and 1.0. In the range of 80−240 Hz, the flame response near 110 and 190 Hz is stronger at each equivalence ratio (0.8−1.0). When the equivalent ratio is 0.9 and 1.0, the amplitude fluctuations of the flame transfer function are much larger than those under other conditions. Meanwhile, the specific performances of the flame structure parameters are that the flame height, average OH* concentration, and flame surface density decrease, and the flame brush thickness increases. These results can be used as a basis for judging combustion instability. This method proves that the parameter information monitored during the flame combustion process can be used to judge the changes in combustion conditions and can adjust the corresponding conditions more accurately and quickly.

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Section: Introductionmentioning

confidence: 99%

Analysis of Combustion Instability of Methane–Air Premixed Swirling Flame Based on OH-PLIF Measurements

et al. 2023

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“…However, currently, it is difficult to find practical applications for most inhibition studies, such as inputting anti−phase sound waves [4] or CO 2 jets [5,6] into combustion systems to suppress oscillating pressure. Passive suppression methods for industrial applications are gradually being established [7,8].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Triggering of Combustion Instability in a Swirling Flame: An Experimental Study

et al. 2023

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Combustion instability is a common thermoacoustic coupling problem in combustion systems, and the pressure oscillations generated inevitably damage the combustion system. Studying the mechanism of combustion instability, especially the triggering problem of combustion instability, is particularly important for understanding combustion instability. This article adopts experimental research methods. The flame transfer function and flame describing function governing pressure pulsation were hereby measured to study the effect of heat release rate fluctuation on acoustic disturbance. By triggering combustion instability through ignition, the growth process of combustion instability was also studied. The results showed that flame pulsation amplitude shows a complex curvature when the frequency is lower than 200 Hz, while the growth rate of pulsation amplitude monotonically decreases as frequencies increase above 200 Hz. According to the considerable self−excited combustion instability tests, the oscillation amplitudes in the limit cycle state are generally greater than 0.4, while the pressure amplitudes in the limited state are less than 0.2, thus verifying the concept of a trigger threshold for low−frequency oscillation. In addition, analysis of the growth rate, the pressure and the attractor of the heat release pulsation observed after the triggering of combustion instability reveals that the triggering of combustion instability is a gradual coupling process between oscillation pressure and heat release rate pulsation.

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Experimental and numerical investigation of aluminum particle combustion driven instability in solid rocket motors

et al. 2023

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Active suppression of swirl-stabilized combustion instability

Cited by 14 publications

References 37 publications

Analysis of Combustion Instability of Methane–Air Premixed Swirling Flame Based on OH-PLIF Measurements

Analysis of Combustion Instability of Methane–Air Premixed Swirling Flame Based on OH-PLIF Measurements

Acoustic Triggering of Combustion Instability in a Swirling Flame: An Experimental Study

Experimental and numerical investigation of aluminum particle combustion driven instability in solid rocket motors

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