A parametric study on the time scales of the scalar field in turbulent premixed flames

An important new development in modeling premixed turbulent combustion is the use of scalar scales which are directly measurable by experiments. An example of such a model relates the mean reaction rates to the temporal or spatial characteristics of instantaneous flame front crossings. These scalar statistics can be obtained by one- point two-time measurements of the scalar field or by two- dimensional laser tomography. The evolution of these scales through the flame brush is central to this modeling framework since the mean creation rate of products may be directly related to them. The cold flow characteristics are determined by Laser Doppler anemometry. The instantaneous flame structure is explored by one-point laser induced Rayleigh scattering technique. Laser tomography is used to determine some spatial statistics of the investigated flames