โ Scribed by S.K. Aggarwal; W.A. Sirignano
No coin nor oath required. For personal study only.
A hybrid Eulerian-Lagrangian method is employed to study a laminar unsteady propagating flame through an air/fuel-vapor/fuel-droplet mixture in a one-dimensional closed constant volume combustor. The gas-phase properties are obtained by using a continuum approach, whereas the computation of liquid-phase properties is based on a Lagrangian approach. A quiescent mixture of air and fuel mist is ignited by providing a hot wall at the end of the combustor. Following ignition, a flame initiates and propagates into the cold spray mixture. The characteristics of the propagating spray flame are presented in terms of the profiles of gas-phase and liquidphase properties. The effects of initial droplet size, equivalence ratio, and fuel volatility are studied. Propagation rate is not a monotonic function of droplet size for all equivalence ratios; spray flame speeds can be faster than the premixed flame speed at certain equivalence ratios. Both a premixed character, due to prevaporization, and a diffusion flame character is seen to be present in the results.
๐ SIMILAR VOLUMES
The structure and propagation of a steady, one-dimensional planar, low-speed flame in a dilute, monodisperse, near-stoichiometric spray, with bulk gas-phase burning, upstream droplet vaporization and downstream droplet vaporization/combustion, are studied through the classification of burning struct
The evolution of a premixed flame under conditions of confinement is studied theoretically. The analysis is based on a hydrodynamic model in which the flame is treated as a surface of discontinuity. The flame structure is assumed to be quasi-steady with a high activation energy and a large heat rele