CH4/H2/N2 Jet Flames
Click image for view
with Rayleigh and PLIF images.
General description: Two simple jet flames of CH4/H2/N2 in low-velocity coflow are presented. Original measurements
at DLR , which include Raman/Rayleigh scattering and planar
imaging, are complemented by LDV measurements performed at
the Darmstadt University of Technology and by Raman/Raleigh/LIF
measurements at Sandia. The scalar data from Sandia are included
in this data archive and include two cases, as listed below.
The higher Re case was close to the blowoff condition and
has some localized extinction. The nozzle has an inner diameter
of 8.0 mm and is tapered to the thin edge.
Descriptions of the experimental methods, boundary conditions,
and measurement uncertainties are included in Ref. , along
with detailed comparisons of the two data sets (DLR and Sandia)
and a discussion of finite rate chemistry effect in the Re=22800
- Nozzle: d=8.0 mm inner diameter, tapered to a sharp
- Fuel composition: 22.1% CH4, 33.2% H2,
- Stoichiometric mixture fraction: Fstoic = 0.167
- Flame DLR_A: Ujet=42.2 m/s; Re=15200
Movie of a turbulent CH4/H2/N2 jet flame in air running in
the Turbulent Combustion Laboratory. (4.5MB)
- Flame DLR_B: Ujet=63.2 m/s; Re=22800
- Coflow: 0.3 m/s, 292K, 0.8% mole fraction H2O
- Scalar Point Measurements (Sandia): Simultaneous Raman/Rayleigh/LIF
measurements of T, N2, O2, CO2,
H2O, H2, CO, OH, and NO were obtained
with a spatial resolution of 0.75 mm. Results include axial
profiles (x/d = 2.5 up to x/d=120) and radial profiles (x/d
= 5, 10, 20, 40, 60, 80) of mean and rms values, conditional
statistics, and single-shot data for each flame. Typically,
800-1000 samples were acquired at each location.
- Scalar Imaging (DLR): Ref. 1 includes selected planar
images of temperature (Rayleigh scattering), OH, CH, and NO.
These provide information on the spatial structure on the
flames. Images may be made available on the web in the future.
Further information on the measurement techniques used at
DLR may be found on the DLR
Data Archive page.
Velocity Measurements: Two-component LDV measurements
(Ref. 3) were conducted by Christoph Schneider at TU Darmstadt
at locations in the flames corresponding to the scalar measurements
and at additional locations closer to the nozzle. Velocity
data may be downloaded from the link below. If there are questions, please, contact Andreas
Dreizler at TU Darmstadt.
Primary Contacts: Wolfgang Meier (firstname.lastname@example.org) and Robert Barlow (email@example.com)
Acknowledgment: Support for the scalar measurements
at Sandia was provided by the US Department of Energy, Office
of Basic Energy Sciences, Division of Chemical Sciences.
Bergmann, V., Meier, W., Wolff, D., and Stricker, W. Appl.
Phys. B 66:489 (1998).
Meier, W., Barlow, R. S., Chen, Y.-L., and Chen, J.-Y., Combust. Flame 123:326-343 (2000).
Schneider, Ch., Dreizler, A., Janicka, J., "Flow Field Measurements of Stable and Locally Extinguishing Hydrocarbon-Fuelled Jet Flames," Combust. Flame 135:185-190 (2003).
DLR Flame Data Archives
Release 1.0 -- 28-APR-00
These data are made available for the purpose of comparisons
with model calculations. Information on measurement techniques,
boundary conditions, and experimental uncertainties may be
found in the references above. The scalar data are available
as either mass fractions or mole fractions, where "X" in the
file name designates mole fraction data and "Y" designates
mass fraction data. Within each archive the "ave", "fav" and
"cnd" files contain ensemble, Favre, and conditional averages,
respectively. The "all" files include complete single-shot
data from each radial profile, with radius tabulated within
each file. File names include the streamwise location of the
radial profile (e.g., DLRB_10.Yfav contains the Favre average
(and rms) mass fractions for a radial profile at x/d=10 in
flame B). The "ax" and "axCnst" files contain axial profiles,
with the latter being constructed from centerline data in
the radial profiles as a check on the repeatability of measurements.
The "CO_LIF" data column should be used for comparisons,
rather than the "CO" (Raman) column.