Evaluation of the damping capacity according to the geometric and the number of resonator with thermal environment using a Rijke tube

Jo, Seonghwi; Choi, Yongjun; Kim, Hong-jip

doi:10.1016/j.ast.2019.02.040

Cited by 25 publications

(3 citation statements)

References 19 publications

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“…The influence of geometric parameters on thermoacoustic oscillations cannot be ignored. Jo et al [25] evaluated the damping capacity according to geometrics and the number of resonators using a Rijke tube, and the decay time of thermoacoustic oscillations was measured to quantify the damping capability in the time domain. Therefore, by illuminating the influence of parameter settings on the triggering time and climb rate of thermoacoustic oscillations, combined with using low-order models to construct a model-based control system [26][27][28], a better design for active control systems for thermoacoustic oscillations can be achieved for real burners.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Parameter Settings on Triggering Time and Climb Rate during Lean-Premixed Combustion Thermoacoustic Oscillations

Tao,

Sun,

Wang

et al. 2024

Applied Sciences

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This study theoretically explored the effects of parameter settings on thermoacoustic oscillations with a low-order model. Three factors were explored—combustor length, inlet gas temperature and thermal power. The research findings indicate that optimizing the parameter settings can yield better thermoacoustic oscillation suppression results. The sound pressure amplitude decreased from 3.2 × 105 Pa to 2.1 × 105 Pa as the combustor length increased from 1.2 m to 6.0 m. The triggering time increased from 0.32 s to 0.91 s when the combustion chamber length increased. The climb rate declined from 23.38 × 105 Pa/s to 3.75 × 105 Pa/s when the combustor length was elongated. The sound pressure amplitude decreased from 3.44 × 105 Pa to 2.4 × 105 Pa as the gas temperature rose from 0 to 100 °C. The triggering time and climb rate variation tendency were similar when the gas temperature increased—both declined as the gas temperature rose. The sound pressure amplitude experienced a slight fluctuation when the thermal power rose. However, the triggering time decreased from 0.26 s to 0.043 s when the thermal power improved. The climb rate increased from 18.72 × 105 Pa/s to 27.65 × 105 Pa/s when the thermal power rose. The oscillation frequency presented was completely different in three cases that had different wavelengths and oscillation intensities. The triggering time and climb rate fluctuated extensively in varying conditions, and the above two factors were interrelated and contradictory to each other when thermoacoustic oscillation was excited. This study explored parameters’ effects on triggering time and climb rate, thereby providing references for constructing a model-based control system for thermoacoustic oscillation feedback control.

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Section: Introductionmentioning

confidence: 99%

The Effects of Parameter Settings on Triggering Time and Climb Rate during Lean-Premixed Combustion Thermoacoustic Oscillations

Tao,

Sun,

Wang

et al. 2024

Applied Sciences

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“…It is believed that the study on the generation mechanism of the Rijke-type thermoacoustic instability could facilitate the understanding of thermoacoustic instability occurring in the more complex practical system. [15][16][17][18][19] Based on a bifurcating Rijke-type combustor, Zhao evaluated the performance of the Helmhotlz resonator 20 and a multi-input/single-output tuning strategy 21 on damping self-sustained thermoacoustic oscillations, and the amplitudes of the limit cycle oscillations were simultaneously reduced in the two outlet branches. In addition, Zhao 22 introduced a temperature-variable heat exchange into the Rijke-type thermoacoustic system which utilized an ammonia/hydrogen combustion system as a heater source.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the stability of the Rijke-type thermoacoustic system with an axially distributed heat source

Pang,

Wang,

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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Due to the incurred damages to the combustors, large-amplitude self-sustained thermoacoustic oscillations are unwanted in many propulsion systems, such as liquid/solid rocket motors and aero-engines. To suppress these thermoacoustic oscillations efficiently, the mechanism of thermoacoustic instability needs to be clarified. Following the previous experimental work, the transitions to instability in a Rijke-type thermoacoustic system with an axially distributed heat source are studied numerically in this paper. The URANS numerical method is utilized and verified by means of a mesh sensitivity analysis. The influences of the axially distributed heater length, the heater location, and the mean flow velocity on the nonlinear dynamic behaviors of thermoacoustic oscillations are evaluated. To explore the corresponding mechanism behind these influences, the principle of acoustic energy conservation has been applied. The acoustic energy gains from the thermal-acoustic coupling are quantified via Rayleigh’s integral, and their phase differences are calculated by the cross-correlation function. The acoustic damping induced by the vortex dissipation is qualitatively analyzed by the characteristics of the flow fields in the Rijke tube. Finally, as the heater length, the heater location, or the mean flow velocity is varied, three mechanisms of the transitions to instability in a Rijke-type thermoacoustic system are identified.

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“…Komkin et al [14] have generated sound field with the help of a loud speaker and placed a Helmholtz resonator at the end wall of a circular duct to study its absorption characteristics. Jo et al [15] discussed the effect of acoustic cavities with large orifice area on damping. Dowd and Meadows [16] have studied the influence of the introduction of a metal plate on the acoustic properties of the Helmholtz resonator.…”

Section: Introductionmentioning

confidence: 99%

Effect of helmholtz resonator shape on suppression of thermo-acoustic instability

Deshmukh¹,

Ansari²,

Phalak³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In combustion chambers thermo-acoustic instabilities arise due to the coupling between the unsteady heat release and pressure fluctuations. The instabilities created cause serious structural vibration, flame blow out, increase in heat transfer and damage, thereby reducing the life span and performance of jet engines, gas turbines and industrial burners. Therefore, there is need to develop a simple technique for effective control of these instabilities. The present work involves experimental study of thermo-acoustic instabilities occurring in a Rijke tube and their suppression by using Helmholtz resonators of different shape (a passive method of suppression). The combustor model is replaced by Rijke tube which is an experimental setup extensively employed for research purpose. Rijke tube is provided with a co-axial pre-mixed gas burner as the source of heat which could be placed at any desired position. When a heat source with proper air to fuel ratio is placed at about one fourth of the tube length, 3rd mode of instability is obtained and a loud noise of frequency 681 Hz is produced. A comparative study of thermo-acoustic instability suppression using cylindrical, spherical and conical Helmholtz resonators has been performed. Spherical resonator has been found to be the most effective one imparting a maximum damping effect of 20 dB and an average damping effect of 10.5 dB.

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Evaluation of the damping capacity according to the geometric and the number of resonator with thermal environment using a Rijke tube

Cited by 25 publications

References 19 publications

The Effects of Parameter Settings on Triggering Time and Climb Rate during Lean-Premixed Combustion Thermoacoustic Oscillations

The Effects of Parameter Settings on Triggering Time and Climb Rate during Lean-Premixed Combustion Thermoacoustic Oscillations

Investigation on the stability of the Rijke-type thermoacoustic system with an axially distributed heat source

Effect of helmholtz resonator shape on suppression of thermo-acoustic instability

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