Proceedings of the Combustion Institute

Journal: Proceedings of the Combustion Institute

Abbreviation

Proc. Combust. Inst.

Publisher

Elsevier

ISSN

1540-7489
1873-2704

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Publications1 - 10 of 73

Soot light absorption and refractive index during agglomeration and surface growth
Kelesidis, Georgios A.; Pratsinis, Sotiris E. (2018)
Proceedings of the Combustion Institute
Three-dimensional direct numerical simulations of turbulent fuel-lean H2/air hetero-/homogeneous combustion over Pt with detailed chemistry
Arani, Behrooz O.; Frouzakis, Christos E.; Mantzaras, John; et al. (2017)
Proceedings of the Combustion Institute
A comparative experimental and numerical investigation of the heterogeneous and homogeneous combustion characteristics of fuel-rich methane mixtures over rhodium and platinum
Sui, Ran; Mantzaras, John; Bombach, Rolf (2017)
Proceedings of the Combustion Institute
Transfer functions of lean fully- and technically-premixed jet-stabilized turbulent hydrogen flames
Moon, Kihun; Martin, Richard; Schuermans, Bruno; et al. (2024)
Proceedings of the Combustion Institute
Understanding the response of multi-jet turbulent hydrogen-air flames to acoustic forcing is key for the development of future carbon-neutral gas turbine combustors. In this paper, we present flame transfer functions (FTFs) deduced from burner and flame transfer matrices obtained with acoustic measurements for fully-premixed (FP) and technically-premixed (TP) conditions, in conjunction with their analytical models. The matrix burner used in this study produces an array of sixteen turbulent lean hydrogen-air jet flames. Its acoustic transfer matrix is analytically modeled, with experimental validation. It exhibits a significant frequency dependence due to the non-compactness of the burner with respect to the acoustic wavelength considered. Our results show that the conical jet-stabilized flames have a typical low-pass filter behavior in the FP case, while in the TP case, they exhibit a frequency dependent gain modulation originating from the combination of mass flow and equivalence ratio oscillations. Using distributed time delay (DTD) models, we identify the dominant disturbances controlling the FTF data measured at different equivalence ratios and bulk velocities, and show that they can be well collapsed by using the associated Strouhal numbers. To unravel the smooth transition of FTF between the FP and TP cases, staging of the fuel is employed in the present study. We demonstrate that the features of the FTFs for staging conditions ranging from FP to TP are strongly correlated with the fuel staging ratio and can be well reproduced by a linear superposition of the FTFs of the pure FP and TP cases.
Electron ionization, photoionization and photoelectron/photoion coincidence spectroscopy in mass-spectrometric investigations of a low-pressure ethylene/oxygen flame
Felsmann, Daniel; Moshammer, Kai; Krüger, Julia; et al. (2015)
Proceedings of the Combustion Institute
Effect of methane on pilot-fuel auto-ignition in dual-fuel engines
Srna, Aleš; Bolla, Michele; Wright, Yuri; et al. (2019)
Proceedings of the Combustion Institute
Nitric oxide detection in turbulent premixed methane/air flames
Herrmann, K.; Boulouchos, Konstantinos (2005)
Proceedings of the Combustion Institute
Passive control of combustion instabilities involving premixed flames anchored on perforated plates
Noiray, Nicolas; Durox, Daniel; Schuller, Thierry; et al. (2007)
Proceedings of the Combustion Institute
Stabilization of a thermoacoustically unstable sequential combustor using non-equilibrium plasma: Large eddy simulation and experiments
Malé, Quentin; Shcherbanev, Sergey; Impagnatiello, Matteo; et al. (2024)
Proceedings of the Combustion Institute
Plasma-assisted combustion using Nanosecond Repetitively Pulsed Discharges (NRPDs) is an emerging technology that enhances the reactivity of fuel–air mixtures, offering significant improvements in operational and fuel flexibility—two crucial features for future sustainable gas turbines. The mechanisms that enable the stabilization of thermoacoustically unstable burners, however, remain unclear. Thus, to investigate the physical phenomena involved, we performed a massively parallel Large Eddy Simulation (LES) of the stabilization of a thermoacoustically unstable sequential combustor by NRPDs at atmospheric pressure. LES is combined with an accurate description of the combustion chemistry and a state-of-the-art phenomenological model for the non-equilibrium plasma effects. In this work, we have validated the simulation framework by comparison with experimental data including acoustic pressure and Heat Release Rate (HRR) signals in both stages of the sequential combustor, and OH-planar laser-induced fluorescence images in the second stage combustion chamber. Hence, this study provides a robust LES framework to study the effects of NRPDs on Thermoacoustic Instabilities (TIs). In addition, the analysis of the LES data reveals a significant decrease of the acoustic energy production in the sequential combustor thanks to the NRPDs. Surprisingly, the steady NRPD actuation generates HRR fluctuations upstream of the combustion chamber, which are in phase opposition to the acoustic pressure, inducing locally a sink term in the acoustic energy balance equation. Moreover, an analysis of the acoustic energy production during the onset of the TI reveals the predominant role of the second stage in developing and sustaining the self-excited TI. The effect of plasma is therefore very effective in stabilizing the system by reducing the acoustic energy production in the sequential stage.
Hetero-/homogeneous combustion of fuel-lean methane/oxygen/nitrogen mixtures over rhodium at pressures up to 12 bar
Sui, Ran; Mantzaras, John; Bombach, Rolf; et al. (2017)
Proceedings of the Combustion Institute

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