Fire on the Web
Profiles in the methane/air diffusion flame at atmospheric pressure using the
Profiles of species concentrations (mole fraction), temperature (K), and velocity (cm/s) are presented, as well as profiles of the mixture fraction and scalar dissipation rate. Species include Ar, CH, CH3, C2H2, C6H6, CH2O, CH4, CO, CO2, H2, H2O, H atom, N2, NO, O2, and O atom. A complete listing of literature citations is also included.
Each file contains one line of header, followed by two or more columns - lateral position (in mm) versus concentration, temperature, or velocity at one or more heights above the burner surface. The file label specifies the particular species, and "B" indicates our best data. When a file contains information at only one height, this height is also indicated - i.e., "-B9" stands for best data at 9 mm above the burner. In this best data set, all of the original data files have been centered and symmetrized (left and right hand sides averaged) with respect to the burner centerline. No smoothing has been carried out, except for the velocity files. Radiation corrections have been made for the thermocouple temperature data, but thermophoretic effects have not been included in the velocity profiles.
The original temperature and velocity files are included and designated as "-DAT" files, covering a range of heights above the burner from 3 to 19 mm.
Measurement Uncertainties. A detailed discussion of measurement uncertainties and database consistency checks can be found in T.S. Norton, K.C. Smyth, J.H. Miller, and M.D. Smooke, Combustion Science and Technology 90:1-34 (1993), wherein our experimental results are compared to computations of Smooke. In addition, a discussion of radical concentrations (specifically H atom, O atom, OH, CH, triplet CH2, and CH3) has been presented in K.C. Smyth, Combustion Science and Technology 115:151-176 (1996). Both of these papers are included here as PDF files, COMPARISON.pdf and NO ANALYSIS.pdf.
Most of the data files are for heights of 7, 9, and 11 mm. This has been a convenient region in which to analyze hydrocarbon chemistry because the concentrations of acetylenic and aromatic hydrocarbons are appreciable, yet significant amounts of soot have not yet formed. With a reasonably complete set of species concentrations, as well as data on temperatures and velocities, two types of analyses have been carried out: (1) net production and destruction rates and (2) reaction rates for specific elementary steps. The particular species are listed below:
Other hydrocarbon concentrations: