Blar i Fakultet for ingeniørvitenskap (IV) på tidsskrift "Combustion and Flame"
Viser treff 1-20 av 29
-
A comprehensive model for char particle conversion in environments containing O2 and CO2
(Journal article; Peer reviewed, 2015)In this work, conversion of char is studied in a simulation code that includes a simplified heterogeneous adsorption–desorption reaction mechanism for char chemical reactivity and uses GRI-Mech 3.0 as the chemical kinetic ... -
A fast-solving particle model for thermochemical conversion of biomass
(Journal article; Peer reviewed, 2020)Computational fluid dynamics (CFD) simulations of large-scale furnaces or reactors for thermal conversion of solid fuels remains challenging partially due to the high computational cost related to the particle sub-models. ... -
Assessment of the LES-FGM framework for capturing stable and unstable modes in a hydrogen / methane fuelled premixed combustor
(Peer reviewed; Journal article, 2023)The main objective of this paper is to assess the capability of compressible Large Eddy Simulations (LES) to capture azimuthal combustion instability. The thickened flame model coupled with Flamelet Generated Manifold (FGM) ... -
Azimuthal flame response and symmetry breaking in a forced annular combustor
(Peer reviewed; Journal article, 2021)In the current study azimuthal forcing of an annular combustor with swirling flames has been performed to present for the first time the Heat Release Rate (HRR) response to all possible pressure fields of the first azimuthal ... -
CFD modeling of biomass combustion and gasification in fluidized bed reactors using a distribution kernel method
(Peer reviewed; Journal article, 2022)A three-dimensional reactive multi-phase particle-in-cell (MP-PIC) model is employed to investigate biomass combustion and gasification in fluidized bed furnaces. The MP-PIC model considered here is based on a coarse grain ... -
Characterisation of flame surface annihilation events in self excited interacting flames
(Journal article; Peer reviewed, 2018)This paper investigates the non-linear flame dynamics of two interacting, premixed, V-shaped flames by characterising the two-dimensional topology of flame annihilation events when the separation distance, S, between them ... -
Computation and prediction of intrinsic thermoacoustic oscillations associated with autoignition fronts
(Peer reviewed; Journal article, 2023)A sequential combustor architecture consists of two longitudinally staged combustion zones featuring a propagation-stabilized flame in the first stage and an autoignition-stabilized flame in the second (reheat) stage. This ... -
Computationally efficient coarse-graining XDEM/CFD modeling of fixed-bed combustion of biomass
(Peer reviewed; Journal article, 2022)In the multi-scale modeling of a dense particle system, the particle phase and the gas phase can be modeled on vastly different scales. The coupling between the two models has a critical influence on the predictions obtained ... -
Correlation effects between turbulence and the conversion rate of pulverized char particles
(Journal article; Peer reviewed, 2017)The effect of turbulence on heterogeneous reactions on the surface of char particles embedded in a turbulent oxidizer, consisting of oxygen and carbon-dioxide, is in this work studied numerically. It is shown that for a ... -
Curvature effects on NO formation in wrinkled laminar ammonia/hydrogen/nitrogen-air premixed flames
(Peer reviewed; Journal article, 2021)The formation of nitrogen oxide (NO) in wrinkled laminar NH3/H2/N2-air premixed flames is investigated utilizing two-dimensional Direct Numerical Simulation (DNS) with detailed chemical kinetics as well as one-dimensional ... -
Development and validation study of a 1D analytical model for the response of reheat flames to entropy waves
(Peer reviewed; Journal article, 2020)Numerical simulations of laminar premixed flames burning hydrogen and methane in spontaneous ignition mode are performed by harmonically exciting the reactants’ temperature at the domain inlet. The results are compared to ... -
Direct Numerical Simulation of hydrogen combustion at auto-ignitive conditions: Ignition, stability and turbulent reaction-front velocity
(Peer reviewed; Journal article, 2021)Direct Numerical Simulations (DNS) are performed to investigate the process of spontaneous ignition of hydrogen flames at laminar, turbulent, adiabatic and non-adiabatic conditions. Mixtures of hydrogen and vitiated air ... -
Drag force for a burning particle
(Peer reviewed; Journal article, 2020)Fully-resolved simulations of a burning char particle are performed to understand the effects of chemical reastions on the drag force by using the ghost cell immersed boundary method. The momentum, heat and mass transfers ... -
The effect of hydrogen addition on the amplitude and harmonic response of azimuthal instabilities in a pressurized annular combustor
(Peer reviewed; Journal article, 2021)The present work introduces an annular combustion chamber operated at intermediate pressures. The combustor is operated with CH-H blends leading to a variety of azimuthal combustion instabilities. The influence of the ... -
The effect of hydrogen enrichment, flame-flame interaction, confinement, and asymmetry on the acoustic response of a model can combustor
(Peer reviewed; Journal article, 2022)To maximise power density practical gas turbine combustion systems have several injectors which can lead to complex interactions between flames. However, our knowledge about the effect of flame-flame interactions on the ... -
The effect of pressure on lean premixed hydrogen-air flames
(Journal article; Peer reviewed, 2023)The effect of pressure on the propagation of lean premixed hydrogen-air flames is investigated numerically with a hierarchy of canonical configurations including direct numerical simulations of turbulent flames in homogeneous ... -
The effect of turbulence on mass transfer in solid fuel combustion: RANS model
(Peer reviewed; Journal article, 2021)In this paper, a kinetic-diffusion surface combustion model is examined. The model is modified such that two effects of turbulence are included: 1) enhancement of the mass transfer due to relative velocity between particles ... -
Effects of scaling laws on the combustion and NOx characteristics of hydrogen burners
(Peer reviewed; Journal article, 2020)This paper proposes a novel bidirectional linkage between a long-term energy system model and an operational power market model. This combined modelling framework provides long-term energy system investment strategies that ... -
Heat release rate response of azimuthal thermoacoustic instabilities in a pressurized annular combustor with methane/hydrogen flames
(Journal article; Peer reviewed, 2022)In this study, the heat release rate (HRR) response during self-excited azimuthal thermoacoustic instabilities in a pressurized annular combustor is investigated for hydrogen/methane blended flames. The equivalence ratio ... -
The influence of hydrogen on the stability of a perfectly premixed combustor
(Journal article; Peer reviewed, 2022)