Can flamelet manifolds capture the interactions of thermo-diffusive instabilities and turbulence in lean hydrogen flames? -- An a-priori analysis [PDF]
Flamelet-based methods are extensively used in modeling turbulent hydrocarbon flames. However, these models have yet to be established for (lean) premixed hydrogen flames. While flamelet models exist for laminar thermo-diffusively unstable hydrogen flames, for which consideration of curvature effects has resulted in improved model predictions, it is ...
arxiv +1 more source
Effects of gravity on laminar gas jet diffusion flames [PDF]
Zero gravity effects on laminar gas jet diffusion ...
Cochran, T. H., Masica, W. J.
core +1 more source
Acoustic disturbances produced by an unsteady spherical diffusion flame [PDF]
The disturbances produced by a moving spherical diffusion flame are investigated within the framework of a linearized theory. After the flame position and species concentrations are determined, the problem of determining the associated density, pressure,
Rasmussen, M. L.
core +1 more source
Numerical Simulation for Droplet Combustion Using Lagrangian Hydrodynamics [PDF]
, 1983 A predictive model of spray combustion must incorporate models for the wide variety of physical environments in a practical combustor. In regions where droplets are closely spaced, combustion resembles a diffusion flame; where they are well separated, an
Fritts, M. J., Fyfe, D. E., Oran, E. S.
core +1 more source
Ignis: A one-dimensional laminar flame code
SoftwareXLaminar flame codes have an important role in combustion modeling. They can provide a fundamental understanding of flame dynamics and provide a basis for building subgrid scale models in turbulent flow simulations.
Jansen P. Berryhill +2 more
doaj
Experimental studies of instabilities of laminar premixed flames [PDF]
International Conference on Combustion and Detonation, Zel'dovich
Memorial II, Russie (2004), 2006 We first briefly recall the basic mechanisms controlling the hydrodynamic and thermo-diffusive stability of planar laminar premixed flames, and give the state of the theoretical analysis. We then describe some novel experiments to observe and measure the growth rate of cellular structures on initially planar flames.
arxiv
Analysis of thermodiffusive instabilities in hydrogen premixed flames using a tabulated flamelet model [PDF]
arXivPreferential diffusion plays a critical role in the evolution of lean premixed hydrogen flames, influencing flame surface corrugation and overall flame behavior. Simulating such flames with tabulated chemistry (TC) methods remains challenging due to the complexity of flame dynamics.
arxiv
Instability of a Flame Front in a Lean H2-N2O Mixture [PDF]
arXiv, 2010 Spark ignition and subsequent flame propagation in a premixed, fuel-lean (equivalence ratio of 0.4) H2-N2O mixture are shown in this fluid dynamics video. High-speed schlieren photography was used to visualize the flame propagation and the complex instabilities that developed on the flame surface.
arxiv
Effects of Water Mist on the Initial Evolution of Turbulent Premixed Hydrogen/Air Flame Kernels
EnergiesIn this study, a series of carrier-phase direct numerical simulations are conducted on spherical expanding premixed hydrogen/air flames with liquid water addition.
Riccardo Concetti +3 more
doaj +1 more source
Applications in Energy and Combustion ScienceIn this study, premixed ammonia‒hydrogen‒air mixtures at different pressures (50∼300 kPa), equivalence ratios (0.7∼1.5), and hydrogen concentrations (9∼50.00 %) were centrally ignited in a closed vessel, and the propagation of a spherical flame was ...
Jun Cheng, Bo Zhang
doaj