Dynamics and diagnostics of flame-acoustic interactions

SR Chakravarthy, R Sampath… - Combustion science and …, 2017 - Taylor & Francis
Flame-acoustic interactions are witnessed in the context of combustion instability in gas
turbine combustors and other propulsion devices, such as rockets, besides confined …

Effects of convection time on the high harmonic combustion instability in a partially premixed combustor

J Yoon, S Joo, J Kim, MC Lee, JG Lee… - Proceedings of the …, 2017 - Elsevier
The fuel composition effects of H 2/CH 4 syngas in a partially premixed model combustor
(PP-MC) were examined for the unique phenomenon of combustion instability (CI) …

Dynamic mode decomposition of syngas (H2/CO) flame during transition to high-frequency instability in turbulent combustor

NA Baraiya, V Ramanan, B Nagarajan, CS Vegad… - Energy, 2023 - Elsevier
The present experimental study investigates the transition in syngas combustion dynamics
from low-to high-frequency thermo-acoustic instability obtained by continuously varying the …

Predicting instability frequency and amplitude using artificial neural network in a partially premixed combustor

S Kwak, J Choi, MC Lee, Y Yoon - Energy, 2021 - Elsevier
In this study, the frequency and amplitude of combustion instability were predicted using an
artificial neural network (ANN). Experimental data, obtained from a CH 4-fueled partially …

Response of flames with different degrees of premixedness to acoustic oscillations

AM Kypraiou, PM Allison, A Giusti… - Combustion Science …, 2018 - Taylor & Francis
The response of three flames with different degrees of premixedness (fully premixed, non-
premixed with radial, and non-premixed with axial fuel injection) to acoustic oscillations is …

Excitation of high frequency thermoacoustic oscillations by syngas in a non-premixed bluff body combustor

NA Baraiya, SR Chakravarthy - International Journal of Hydrogen Energy, 2019 - Elsevier
A laboratory-scale bluff body combustor is mapped for its stability and flame dynamics of non-
premixed flames with three fuels, namely, pure H 2, H 2 single bondCH 4 mixture, and H 2 …

Experimental study of transition in dynamical states of thermo-acoustic oscillations in a turbulent bluff body combustor

S Jatoliya, P Singh, NA Baraiya, S Karthikeyanathan… - Nonlinear …, 2024 - Springer
This study investigates the shift in dynamical states of the thermo-acoustic oscillations for the
turbulent syngas combustor having a bluff body for the flame anchoring. In this paper, an …

Difference in thermo-acoustic instability frequency between partially and fully premixed flames

S Kwak, S Joo, M Chul Lee, Y Yoon - Journal of Propulsion and Power, 2022 - arc.aiaa.org
The difference in thermo-acoustic instability frequency was analyzed between partially
premixed (PP) and fully premixed (FP) flames in a methane-fueled gas turbine combustor …

Experimental investigation into the role of mean flame stabilization on the combustion dynamics of high-hydrogen fuels in a turbulent combustor

NA Baraiya, V Ramanan… - … for Gas Turbines …, 2021 - asmedigitalcollection.asme.org
A bluff-body turbulent combustor is mapped for its thermo-acoustic stability across variation
in airflow rate, nondimensionalized as the Reynolds number (Re) and fuel composition. The …

The role of mean flame anchoring on the stability characteristics of syngas, synthesis natural gas, and hydrogen fuels in a turbulent non-premixed bluff-body …

NA Baraiya, SR Chakravarthy - … Expo: Power for …, 2019 - asmedigitalcollection.asme.org
A lab-scale bluff body combustor is mapped for its stability and flame dynamics of non-
premixed flames. The characteristics are observed across variations in the fuel composition …