COMPARISON OF CARS MEASUREMENTS AND CALCULATIONS OF THE STRUCTURE OF LAMINAR METHANE-AIR COUNTERFLOW DIFFUSION FLAMES

Information on the structure of laminar diffusion flames under the influence of the strain of an inhomogeneous velocity field is essential for the understanding of turbulent diffusion flames. To simulate the structure of the stagnation-point flame the corresponding governing equations for enthalpy, momentum, and chemical species are to be solved. By boundary layer approximations and a coordinate transformation these equations are transformed into a one dimensional form, which is integrated with a finite differences method. Transport is described by a simplified multicomponent model. The detailed reaction mechanism consists of more than 250 elementary steps and 39 chemical species. - For comparison with the numerical results Coherent Anti-Stokes Raman Scattering (CARS) is used to determine temperature and concentration profiles in an atmospheric pressure CH//4/air counterflow diffusion flame.