Review of combustion-acoustics instabilities

Oyediran, Ayo A.; Darling, Douglas; Radhakrishnan, Krishnan

doi:10.2514/6.1995-2469

Cited by 17 publications

(9 citation statements)

References 17 publications

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“…Self-sustained oscillations occur due to hydrodynamic instabilities observed in the wakes behind bluff bodies (Provansal, Mathis & Boyer 1987;Monkewitz 1988;Emerson et al 2012), and in the flow field of low density jets (Huerre & Monkewitz 1985;Li & Juniper 2013a) and are also due to thermoacoustic interactions in confined reacting flows (Crocco & Cheng 1956;Oyediran, Darling & Radhakrishnan 1995;Lieuwen & Yang 2005). Systems having temporally unstable global modes behave as oscillators (Huerre & Monkewitz 1990).…”

Section: Introductionmentioning

confidence: 99%

Forced synchronization and asynchronous quenching of periodic oscillations in a thermoacoustic system

2019

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We perform an experimental and theoretical study to investigate the interaction between an external harmonic excitation and a self-excited oscillatory mode ($f_{n0}$) of a prototypical thermoacoustic system, a horizontal Rijke tube. Such an interaction can lead to forced synchronization through the routes of phase locking or suppression. We characterize the transition in the synchronization behaviour of the forcing and the response signals of the acoustic pressure while the forcing parameters, i.e. amplitude ($A_{f}$) and frequency ($f_{f}$) of forcing are independently varied. Further, suppression is categorized into synchronous quenching and asynchronous quenching depending upon the value of frequency detuning ($|\,f_{n0}-f_{f}|$). When the applied forcing frequency is close to the natural frequency of the system, the suppression in the amplitude of the self-excited oscillation is known as synchronous quenching. However, this suppression is associated with resonant amplification of the forcing signal, leading to an overall increase in the response amplitude of oscillations. On the other hand, an almost 80 % reduction in the root mean square value of the response oscillation is observed when the system is forced for a sufficiently large value of the frequency detuning (only for $f_{f}<f_{n0}$). Such a reduction in amplitude occurs due to asynchronous quenching where resonant amplification of the forcing signal does not occur, as the frequency detuning is significantly high. Further, the results from a reduced-order model developed for a horizontal Rijke tube show a qualitative agreement with the dynamics observed in experiments. The relative phase between the acoustic pressure ($p^{\prime }$) and the heat release rate ($\dot{q}^{\prime }$) oscillations in the model explains the occurrence of maximum reduction in the pressure amplitude due to asynchronous quenching. Such a reduction occurs when the positive coupling between $p^{\prime }$ and $\dot{q}^{\prime }$ is disrupted and their interaction results in overall acoustic damping, although both of them oscillate at the forcing frequency. Our study on the phenomenon of asynchronous quenching thus presents new possibilities to suppress self-sustained oscillations in fluid systems in general.

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Section: Introductionmentioning

confidence: 99%

Forced synchronization and asynchronous quenching of periodic oscillations in a thermoacoustic system

2019

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“…This mesh configuration was selected after a broad literature review. In this task, recommendations about the grid resolution [130][131][132][133][134] and temporal discretization [52,103] were taken into account in order to ensure a correct capture of the main features of Diesel combustion [135,136] and its subsequent unsteady pressure oscillations [10,137].…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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derstanding the unsteady pressure field inside combustion chambers of compression ignition engines using a CFD approach". International J of Engine Research (available on-line), 2018. I would like to record my sincere gratitude to my advisor Prof. Alberto Broatch for his guidance and support during the chase of this research. A gratitude that also must be extended to Prof. Payri and Prof. Desantes on behalf of CMT-Motores Térmicos and Universitat Politècnica de València for offering me the chance to become part of this research group during these four years. I owe my most special thanks to Prof. Ricardo Novella for his advice and invaluable help in the most difficult moments but especially for the good ones we shared during the fruitless lunchtime discussions, sports sessions... I just can say, moltes gràcies per tot Rick.

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“…These pressure oscillations and the enhanced heat transfer can damage the structural integrity of the system and degrade performance, and may actually cause structural damage 4 . In the worst cases, combustion instability can lead to catastrophic failure of the propulsion system 5,6 . C There has been a great deal of experimental and computational work to study the causes and characteristics of combustion instability and to develop models that accurately capture the physics and instability mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Plasma Control of Combustion Instability in a Lean Direct Injection Gas Turbine Combustor

D'Entremont

Gejji

Venkatesh

et al. 2014

52nd Aerospace Sciences Meeting

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Combustion instabilitiy, despite being researched extensively for the past five decades, remains an important issue for modern propulsion and energy systems. The impact of instabilities ranges from increased loading on system components to catastrophic system failure. To date, most strategies for controlling combustion instability have involved either changing subsystem geometry or using an actuator to modify a system parameter, such as the fuel flow rate. In this paper the groundwork is laid for the use of plasmas as an active control mechanism of combustion instabilities. The discharge characteristics of two circuits are examined to determine their compatibility with the instabilities seen in an existing leandirect injection (LDI) combustion chamber. The influence of pressure on the power and energy of a circuit is also examined. Finally, future work to improve the circuits is discussed as well as plans to begin full-scale testing in the LDI combustion chamber.

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Review of combustion-acoustics instabilities

Cited by 17 publications

References 17 publications

Forced synchronization and asynchronous quenching of periodic oscillations in a thermoacoustic system

Forced synchronization and asynchronous quenching of periodic oscillations in a thermoacoustic system

Computational assessment of combustion noise of automotive compression-ignited engines

Plasma Control of Combustion Instability in a Lean Direct Injection Gas Turbine Combustor

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