Characterizing modal exponential growth behaviors of self-excited transverse and longitudinal thermoacoustic instabilities

D Zhao, Y Guan - Physics of Fluids, 2022 - pubs.aip.org
Self-excited thermoacoustic instabilities as frequently observed in rocket motors, gas
turbines, ramjets, and aeroengine afterburners are highly detrimental and undesirable for …

Common features in the thermoacoustics of flames and engines

CJ Lawn, G Penelet - International Journal of Spray and …, 2018 - journals.sagepub.com
Thermoacoustic phenomena generated inadvertently during combustion, and those
produced by heating and cooling material to generate a temperature gradient, have mostly …

Linear growth rate estimation from dynamics and statistics of acoustic signal envelope in turbulent combustors

N Noiray - Journal of Engineering for Gas Turbines …, 2017 - asmedigitalcollection.asme.org
Considerable research and development efforts are required to meet the targets of future
gas turbine technologies in terms of performance, emissions, and operational flexibility. One …

The effect of the flame phase on thermoacoustic instabilities

G Ghirardo, MP Juniper, MR Bothien - Combustion and Flame, 2018 - Elsevier
This paper concerns the influence of the phase of the heat release response on
thermoacoustic systems. We focus on one pair of degenerate azimuthal acoustic modes …

Thermodynamics-acoustics coupling studies on self-excited combustion oscillations maximum growth rate

D Zhao - Journal of Thermal Science, 2022 - Springer
Unlike electric vehicles and electric aircrafts, hydrocarbon-fuelled (fossil) engine systems
are much noisier. By conducting one-step chemical reaction-thermodynamics-acoustics …

Adjoint-accelerated Bayesian inference applied to the thermoacoustic behaviour of a ducted conical flame

M Yoko, MP Juniper - Journal of Fluid Mechanics, 2024 - cambridge.org
We use Bayesian inference, accelerated by adjoint methods, to construct a quantitatively
accurate model of the thermoacoustic behaviour of a conical flame in a duct. We first perform …

Experimental and theoretical studies on thermoacoustic limit cycle oscillation in a simplified solid rocket motor using flat flame burner

B Ma, J Li, Z Zhang, Y Xi, D Zhao, N Wang - Acta Astronautica, 2021 - Elsevier
Combustion instability is a common phenomenon in solid rocket motors. Coupling between
pressure and heat release rate produces pressure oscillation, which seriously affects the …

The effect of variable fuel staging transients on self-excited instabilities in a multiple-nozzle combustor

W Culler, X Chen, J Samarasinghe, S Peluso… - Combustion and …, 2018 - Elsevier
Combustion instability in gas turbine engines is often mitigated using fuel staging. Fuel
staging, sometimes referred to as fuel splitting, is a strategy by which fuel is unevenly …

Zero-crossing rate method as an efficient tool for combustion instability diagnosis

S Joo, J Choi, N Kim, MC Lee - Experimental Thermal and Fluid Science, 2021 - Elsevier
A novel methodology based on the zero-crossing rate (ZCR) is introduced to diagnose
combustion instability (CI) in a combustion system. This method can assess the combustion …

Amplitude statistics prediction in thermoacoustics

G Ghirardo, F Boudy, MR Bothien - Journal of Fluid Mechanics, 2018 - cambridge.org
We discuss the statistics of acoustic pressure of thermoacoustic oscillations, either axial or
azimuthal in nature. We derive a model where the describing functions of the fluctuating heat …