ID#: 46
Abstract Title: Simulations of Premixed Turbulent Stagnation Flames with a Flame Speed Closure Model
Session Title: Premixed Turbulent Flames II
Session Date: 7/30/01
Session Start Time: 11:20 AM
Contributing Author: Lipatnikov, A.N.
Organization: Chalmers University of Technology
Country: Sweden
Authors: Andrei N. Lipatnikov, Jerzy Chomiak
Short Abstract: Numerical simulations of premixed turbulent stagnation flames have been performed using the Flame Speed Closure (FSC) model in order: (1) to further test the model under inauspicious conditions, and (2) to test whether or not stagnation flames are equivalent to fully developed flames in homogeneous flow fields, i.e., to planar flames of a constant thickness, which propagate at a constant speed against a stationary and spatially uniform unburned mixture flow. Numerical simulations of various known experiments have been performed without variations in the only remaining model constant. The results indicate that the model well predicts the stationarity of these flames, their structure, their mean thickness, and the local minimum of the mean gas flow velocity, associated often with turbulent flame speed. The ability of the model to predict the above properties suggests that the flames studied are not fully developed, because the FSC model cannot describe the aforementioned classical fully developed flames, in principle. A simple model problem described semi-analytically is considered in order to show possible difference between premixed turbulent stagnation flames and the classical fully developed ones.