Proceedings of the international workshop on measurement and computation of turbulent nonpremixed flames

Abstract

This SAND report documents the proceedings of the International Workshop on Measurement and Computation of Turbulent Nonpremixed Flames, held in Naples, Italy on July 26-27, 1996. Contents include materials that were distributed to participants at the beginning of the workshop, as well as a Summary of Workshop Accomplishments that was generated at the close to this Naples meeting.The Naples workshop involved sixty-one people from eleven countries. The primary objectives were: i) to select a set of well-documented and relatively simple flames that would be appropriate for collaborative comparisons of model predictions; and ii) to specify common submodels to be used in these predictions, such that models for the coupling of turbulence and chemistry might be isolated and better understood.These proceedings are also "published" on the Web and those interested in the ongoing process of data selection and model comparison should consult the workshop page for the most recent and complete information on these collaborative research efforts. The URL is:

A priori investigation of PDF-modeling assumptions for a turbulent swirling bluff body flame (‘SM1’)

“…For the flame studied, the scatter data in composition space, taken at fixed locations in physical space, is similar to what is observed in jet type flames with a substantial amount of local exinction, such as Sandia Flames E and F [7][8][9] in that there is strong deviation from steady-flamelet type lines in composition space (corresponding to little or no local extinction). A study on the experimental data of Sandia Flames D -F as discussed in [10] led to the formulation of the double conditioned CMC approach, using sensible enthalpy as progress variable.…”

Scalar PDF and velocity-scalar PDF modelling of the bluff-body stabilised flame HM1 using ILDM

“…The agreement deteriorates in the neck zone and the jet-like zone (from about x = 1.8D b ). These downstream discrepancies have been observed in the different RANS calculations presented at the TNF workshops [11]. An important observation for the present study is that the very small differences between scalar PDF and velocity-scalar PDF results (due to some differences in mean density) are negligible.…”

“…The flame considered is the Sydney bluff-body stabilised flame HM1 [8,9,10] which is a target flame of the International Workshop on Measurement and Computation of Turbulent Nonpremixed Flames [11].…”

Ammonia conversion and NOx formation in laminar coflowing nonpremixed methane-air flames

“…where σ is the Stefan-Boltzmann constant, a P,k is the Planck mean absorption coefficient for species k, and T b is the background temperature [36]. The stress tensor is given by:…”