Entropy generation and CO2 emission in presence of pulsating oscillations in a bifurcating thermoacoustic combustor with a Helmholtz resonator at off-design conditions

Guan, Yiheng; Becker, Sid; Zhao, Dan; Xu, Jingyuan; Shahsavari, Mohammad; Schlüter, Jörg

doi:10.1016/j.ast.2023.108204

Cited by 38 publications

(3 citation statements)

References 73 publications

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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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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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“…1 Helmholtz resonator is a kind of acoustic passive damper widely used in engineering practice. [3][4][5] Zhao et al [6][7][8] discussed the acoustic damping performance of single-layer and double-layer perforated plates in the presence of temperature gradient. However, the numerical simulation and experiments in this paper are carried out under constant temperature and the change of sound absorption and insulation performance with temperature gradient is not involved.…”

Section: Introductionmentioning

confidence: 99%

Study on acoustic performance of new spiral sound absorbing and insulating metamaterial

Liu,

Zhao

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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Middle and low frequency band sound waves have strong penetration and diffraction abilities during the propagation process, making it difficult to attenuate. The control of middle and low frequency broadband sound waves has become a challenging topic. Therefore, it is necessary to develop new materials or structures with middle and low frequency sound absorption, insulation, and noise reduction functions. The special properties of acoustic metamaterial provide new ideas for the development of sound absorption and insulation. In order to effectively control the noise in the lower frequency band, a new spatial spiral acoustic metamaterial was designed. First, the mechanism of band gap characteristics of a new spatial spiral acoustic metamaterial is analyzed. Then, a new spatial spiral acoustic metamaterial is completed through the finite element software COMSOL Multiphysics and the calculation and analysis of sound absorption and insulation performance in the 100–2500 Hz frequency band are completed. With the help of 3D printing, the preparation of metamaterial is completed, and the comparative experimental study of sound absorption and insulation performance of spiral acoustic metamaterial is carried out to verify the accuracy of the calculation method.

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“…For engineering practice, the latest work provides a numerical tool of analyzing thermoacoustic systems [2]. It could be applied to predict the acoustic signature of the combustor and to examine and evaluate the performance self−sustained thermoacoustic oscillations.…”

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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Entropy generation and CO2 emission in presence of pulsating oscillations in a bifurcating thermoacoustic combustor with a Helmholtz resonator at off-design conditions

Cited by 38 publications

References 73 publications

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

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

Study on acoustic performance of new spiral sound absorbing and insulating metamaterial

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

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