4.7 Article

Nonlinear interactions between the fundamental and its harmonics of self-excited azimuthal thermoacoustic instabilities

相关参考文献

注意:仅列出部分参考文献,下载原文获取全部文献信息。
Article Engineering, Aerospace

Optimal Sensor Placement for Azimuthal Acoustic Modes in Cylindrical Ducts

Jeongwon Kim et al.

Summary: This paper introduces a methodology to determine optimal sensor locations in cylindrical ducts for identifying azimuthal acoustic modes. The results show that the optimal locations can decrease the uncertainty of the estimated wave amplitudes and pressures, and a table summarizing the optimal locations for various combinations is provided.

AIAA JOURNAL (2022)

Article Thermodynamics

Nonlinear dynamics of combustor azimuthal modes: Experiments and modeling

Jeongwo Kim et al.

Summary: This paper investigates azimuthal instabilities in a lean, premixed combustor and presents a weakly nonlinear framework to interpret the results. It shows the importance of linear instability growth/damping rate and azimuthal non-uniformities in controlling different wave behaviors.

COMBUSTION AND FLAME (2022)

Article Mechanics

Spontaneous and explicit symmetry breaking of thermoacoustic eigenmodes in imperfect annular geometries

Thomas Indlekofer et al.

Summary: This article investigates the symmetry breaking of azimuthal thermoacoustic modes in annular combustors and reveals both spontaneous reflectional symmetry breaking and unexpected explicit rotational symmetry breaking. By deriving and solving a multidimensional Fokker-Planck equation, the unified picture of phase space topology is unraveled. The experimental results demonstrate that azimuthal thermoacoustic oscillations will exhibit a statistically dominant orientation in the vicinity of the Hopf bifurcation.

JOURNAL OF FLUID MECHANICS (2022)

Article Engineering, Mechanical

Experimental Investigation of Interactions Between Two Closely Spaced Azimuthal Modes in a Multinozzle Can Combustor

Jeongwon Kim et al.

Summary: This study reveals complex coupling across closely spaced frequencies between different azimuthal modes in annular or circular combustors under thermoacoustic instability conditions, highlighting the importance of understanding this coupling to capture limit cycle dynamics.

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME (2022)

Article Engineering, Mechanical

Azimuthal Instabilities of an Annular Combustor With Different Swirling Injectors

Preethi Rajendram Soundararajan et al.

Summary: This article investigates the effects of swirlers on combustion instabilities through experiments and finds that swirl number and pressure drop have significant impacts on instabilities. The results show that higher swirl number swirlers are more prone to azimuthal instabilities, while lower swirl number swirlers exhibit better stability. By comparing the statistical preferences of spin ratio distributions under different arrangements, it is found that the rotation direction does not have a clear influence on the spin ratio distribution. The occurrence of instabilities is tentatively explained using flame describing functions, and distinct differences are observed between different categories of swirlers.

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME (2022)

Article Thermodynamics

Experiments and low-order modelling of intermittent transitions between clockwise and anticlockwise spinning thermoacoustic modes in annular combustors

Abel Faure-Beaulieu et al.

Summary: Annular combustion chambers in gas turbines and aircraft engines can experience unstable azimuthal thermoacoustic modes, leading to high amplitude acoustic waves propagating in the azimuthal direction. A low-order model is proposed to qualitatively describe the dynamics of these thermoacoustic azimuthal modes, considering the impact of turbulent combustion noise and stochastic excitation. Experimental results on a laboratory scale combustor support the model's predictions of mode behavior and direction switching time under the influence of turbulent noise.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

Article Thermodynamics

Self-excited longitudinal and azimuthal modes in a pressurised annular combustor

Marek Mazur et al.

Summary: A new laboratory scale pressurised annular combustion experiment is introduced to study self-excited longitudinal and azimuthal instabilities. The experiment shows that at high equivalence ratios, flame stabilisation location propagates upstream, leading to a transition from dominant longitudinal to dominant azimuthal instability. Investigation of azimuthal instabilities reveals rich frequency content, including higher harmonics, with distinct modal dynamics.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

Article Thermodynamics

The effect of hydrogen addition on the amplitude and harmonic response of azimuthal instabilities in a pressurized annular combustor

Thomas Indlekofer et al.

Summary: This study introduces an annular combustion chamber operated at intermediate pressures with CH4-H2 blends, leading to various combustion instabilities. Higher hydrogen content can result in high-amplitude instabilities with significant pressure amplitude contributions, including higher order harmonics. The harmonic response is amplitude dependent with a quadratic relationship between harmonic components of pressure amplitudes.

COMBUSTION AND FLAME (2021)

Article Mechanics

Imperfect symmetry of real annular combustors: beating thermoacoustic modes and heteroclinic orbits

Abel Faure-Beaulieu et al.

Summary: In jet engines and gas turbines, the annular shape of the combustion chamber can lead to the appearance of self-oscillating azimuthal thermoacoustic modes. Experimental evidence of a new type of modal dynamics characterized by periodic switching of spinning direction has been reported, along with a theoretical model explaining this phenomenon. The model shows that tiny asymmetries of the geometry, mean temperature field, thermoacoustic response of flames, or acoustic impedance of walls in real systems can induce these heteroclinic orbits.

JOURNAL OF FLUID MECHANICS (2021)

Article Engineering, Mechanical

High Amplitude Combustion Instabilities in an Annular Combustor Inducing Pressure Field Deformation and Flame Blow Off

Guillaume Vignat et al.

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME (2020)

Article Physics, Fluids & Plasmas

Symmetry breaking of azimuthal waves: Slow-flow dynamics on the Bloch sphere

Abel Faure-Beaulieu et al.

PHYSICAL REVIEW FLUIDS (2020)

Article Engineering, Mechanical

Pulsation-Amplitude-Dependent Flame Dynamics of High-Frequency Thermoacoustic Oscillations in Lean-Premixed Gas Turbine Combustors

Frederik M. Berger et al.

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME (2018)

Article Engineering, Mechanical

Strong Azimuthal Combustion Instabilities in a Spray Annular Chamber With Intermittent Partial Blow-Off

Kevin Prieur et al.

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME (2018)

Article Thermodynamics

Effect of equivalence ratio on the modal dynamics of azimuthal combustion instabilities

Nicholas A. Worth et al.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2017)

Article Thermodynamics

Nonlinear analysis of an acoustically excited laminar premixed flame

S. Schlimpert et al.

COMBUSTION AND FLAME (2016)

Article Thermodynamics

A new pattern of instability observed in an annular combustor: The slanted mode

J. F. Bourgouin et al.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2015)

Article Engineering, Mechanical

Analysis of Azimuthal Thermo-acoustic Modes in Annular Gas Turbine Combustion Chambers

Mirko R. Bothien et al.

JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME (2015)

Article Thermodynamics

Modal dynamics of self-excited azimuthal instabilities in an annular combustion chamber

Nicholas A. Worth et al.

COMBUSTION AND FLAME (2013)

Article Thermodynamics

Investigation of azimuthal staging concepts in annular gas turbines

Nicolas Noiray et al.

COMBUSTION THEORY AND MODELLING (2011)

Article Thermodynamics

Non-linear response of turbulent premixed flames to imposed inlet velocity oscillations of two frequencies

R. Balachandran et al.

FLOW TURBULENCE AND COMBUSTION (2008)