Flamespeeds & Premixed Flames
Knowledge about flamespeeds is required for very many technical and scientific problems in the areas of combustion and reactive flows. Even often for the evaluation, modelling and computation of turbulent reactive flows and flames, frequently laminar flamespeeds need to be known.
With Cosilab, laminar flamespeeds for practically any combustion system and fuel or fuel composition can be calculated. Such calculation takes place within the framework of the computation of a laminar, one-dimensional, freely propagating flame. However, latter flames are not only relevant for the computation of flamespeeds, also knowledge about their internal stucture is important for a variety technical applications that have to take precautions against excessive pollutant and soot formation.
As an example, shown in the following figure, are flamespeeds calculated with Cosilab for an atmospheric-pressure hydrogen-air flame for a range of equivalence ratio. Included are computational results from two research groups and experimental results from the literature.
Shown in the following figure are -- for a stoichiometric methane-air flame at atmospheric pressure -- plots of the flame structure in terms of the profiles of temperature and mole fractions of CO2, O2, CO, H2, H, H2O, OH and NO. These plots were prepared from the computational results using Cosilab's built-in, graphic xyPlot facility.
The next figure shows a screenshot of the Cosilab graphical user interface displaying the reaction-pathway analyisis for a freely propagating methane-air flame.
Finally, for the same flame, we show the screenshot of the results of flamespeed sensitivity analysis displayed by Cosilab's built-in graphical tools.