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 …
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 …
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 …
gas turbine technologies in terms of performance, emissions, and operational flexibility. One …
The effect of the flame phase on thermoacoustic instabilities
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 …
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 …
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 …
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 …
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 …
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
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 …
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 …
azimuthal in nature. We derive a model where the describing functions of the fluctuating heat …