Predicting the Onset and Control of Thermoacoustics

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: 29 September 2024 | Viewed by 2976

Special Issue Editors

School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: combustion instability; nonlinear analysis; control of thermoacoustic oscillations

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Guest Editor
School of Mechanical Engineering, Tongji University, Shanghai 201804, China
Interests: combustion instability and combustion noise control; aeroacoustics; clean combustion; computational fluid dynamics
Special Issues, Collections and Topics in MDPI journals
School of Energy and Environment, Southeast University, Nanjing 210096, China
Interests: thermoacoustic engines; power generators; refrigerators/heat pumps
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Thermoacoustics is a highly interdisciplinary science that encompasses the fields of thermodynamics, acoustics and fluid mechanics. On the one hand, when thermoacoustic instability occurs in the propulsion systems and industrial combustors, such as in liquid/solid rocket engines, aero-engines, afterburners, land-based gas turbines and furnaces, large-amplitude pressure/heat oscillations may incur several unwanted outcomes, including structural vibrations, severe erosions, missile launch deviation from the designed trajectory, or even explosion. There are two main ways to prevent the onset of thermoacoustic instability or efficiently suppress such detrimental oscillations: passive control and active control. Passive control involves either absorbing acoustic energy by utilizing acoustic dampers, such as quarter wave tubes, acoustic liners, Helmholtz resonators, and perforated plates, or decreasing the responsiveness of the combustion process to acoustic excitation via structure modification, such as the structure asymmetry, modifying the fuel injection system and changing the position of the heat source. Active control involves using sensors, controllers and the actuators to break the positive interaction between the unsteady heat release rate and acoustic pressure. On the other hand, the interaction between acoustic waves and solid porous materials contributes to energy conversion between heat and sound, which is encouraged and lays the foundation for thermoacoustic engines and refrigerators. By integrating a thermoacoustic engine with an acoustic-to-electric transducer (such as linear alternators, piezoelectric transducers, and triboelectric nano-generators), thermoacoustics can be utilized for power generation or energy-harvesting purposes. In addition, a thermoacoustic engine can be utilized to drive a thermoacoustic refrigerator, providing a novel approach to producing cooling using heat. This Special Issue aims at the accurate prediction of its onset and effective control of large-amplitude pressure oscillations.

Dr. Xinyan Li
Dr. Chenzhen Ji
Dr. Geng Chen
Guest Editors

Manuscript Submission Information

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Keywords

  • thermoacoustic oscillations
  • nonlinear analysis
  • prediction of its onset
  • active and passive control

Published Papers (2 papers)

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Research

12 pages, 3452 KiB  
Article
Empirical Modeling of Subcritical Hopf Bifurcation of Thermoacoustic Stirling Engine
by Chuan-Heng Lai and Shu-Han Hsu
Aerospace 2024, 11(5), 347; https://doi.org/10.3390/aerospace11050347 - 26 Apr 2024
Viewed by 884
Abstract
This study models the subcritical Hopf bifurcation in thermoacoustic Stirling engines using the Stuart–Landau model, highlighting the role of nonlinear dynamics. By inducing self-sustained oscillations and measuring pressure fluctuations across different temperature gradients imposed on the regenerator, we reveal the engine’s transition to [...] Read more.
This study models the subcritical Hopf bifurcation in thermoacoustic Stirling engines using the Stuart–Landau model, highlighting the role of nonlinear dynamics. By inducing self-sustained oscillations and measuring pressure fluctuations across different temperature gradients imposed on the regenerator, we reveal the engine’s transition to a nonlinear domain, characterized by heightened oscillation amplitudes and unique periodic patterns. Interpreted Landau constants and growth rates illuminate the stabilizing effects of nonlinear dynamics, demonstrating the Stuart–Landau model’s applicability in thermoacoustic engine analysis. Our research confirms that this empirically refined model reliably describes oscillation amplitudes and transient phenomena, contributing valuable perspectives for advancing thermoacoustic engine design and operational understanding. Full article
(This article belongs to the Special Issue Predicting the Onset and Control of Thermoacoustics)
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20 pages, 4913 KiB  
Article
Investigation of Harmonic Response in Non-Premixed Swirling Combustion to Low-Frequency Acoustic Excitations
by Jinrong Bao, Chenzhen Ji, Deng Pan, Chao Zong, Ziyang Zhang and Tong Zhu
Aerospace 2023, 10(9), 812; https://doi.org/10.3390/aerospace10090812 - 15 Sep 2023
Cited by 1 | Viewed by 1096
Abstract
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion. This relationship leads to a complex coupling between the spatial [...] Read more.
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion. This relationship leads to a complex coupling between the spatial distribution of the equivalence ratio and the propagation mechanism of flow disturbance. In the present study, the response of a methane-air non-premixed swirling flame to low-frequency acoustic excitations was investigated experimentally. By applying Proper Orthogonal Decomposition (POD) analysis to CH* chemiluminescence images, the harmonic flame response was revealed. Large Eddy Simulation (LES) was utilized to analyze the correlation between the vortex motion within the shear layers and the harmonic response under non-reacting conditions at excitation frequencies of 20 Hz, 50 Hz, and 150 Hz. The results showed that the harmonic flame response was mainly due to the harmonic velocity pulsations within the shear layers. The acoustically induced vortices within the shear layer exhibited motion patterns susceptible to harmonic interference, with spatial distribution characteristics closely related to the oscillation modes of the non-premixed combustion. Full article
(This article belongs to the Special Issue Predicting the Onset and Control of Thermoacoustics)
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