Modelling of Premixed Combustion Using a Thin Flame Sheet and the Effect of the Hydrodynamic Instability

摘要

A dynamic thin flame model that introduces the effect of flame structure on the burning velocity is described and appropriate numerical schemes are constructed to obtain solutions in configurations with available experimental data for validation. Using this model, the role of the hydrodynamic instability, which arises due to the imbalance between the flow and the local burning velocities, on the evolution of the flame front and the pressure history during the combustion of premixed gases in confined chambers is investigated. It is shown that the hydrodynamic instability plays an important role and that accurate modeling can only be achieved if the stabilizing effect due to flame curvature is included, in the formulation. The problem is relevant to the modeling of combustion in engines, pressure rise due to confined explosion, and the analysis of processes governed by flame-flow interactions. Results provide an interpretation for phenomena associated with large scale distortion of flames and shed light on their underlying mechanism. (ERA citation 13:036692)