Test Data AC2-09: Difference between revisions

From KBwiki
Jump to navigation Jump to search
Line 39: Line 39:
and the coflow  velocity ''U<sub>cfl</sub>''&nbsp;=&nbsp;0.9&nbsp;m/s.
and the coflow  velocity ''U<sub>cfl</sub>''&nbsp;=&nbsp;0.9&nbsp;m/s.
<center>
<center>
[[Image:AC2-09_fig3a.gif|300px]]
[[Image:AC2-09_fig3a.gif|300px]][[Image:AC2-09_fig3b.gif|300px]]
</center>
</center>



Revision as of 10:12, 29 April 2011

Front Page

Description

Test Data

CFD Simulations

Evaluation

Best Practice Advice

SANDIA Flame D

Application Challenge AC2-09   © copyright ERCOFTAC 2024

Overview of Tests

The velocity measurements were performed with two-component fiber-optic laser Doppler anemometer (Dantec). All the details of the flow field measuring techniques applied in Sandia Flame D experiment are explained in[1]. Measured scalars for Sandia D Flame include temperature, mixture fraction, N2, O2, H2O, H2, CH4, CO, CO2, OH and NO. Experimental methods and measurement uncertainties are outlined in[1] Spontaneous Raman scattering of the beams from two Nd:YAG lasers (532 nm) was used to measure concentrations of the major species. The Rayleigh scattering signal was converted to temperature using a species-weighted scattering cross section, based on the Raman measurements. Linear laser-induced fluorescence (LIF) was used to measure OH and NO, and the fluorescence signals were corrected on a shot-to-shot basis for variations in Boltzmann fraction and collisional quenching rate. The concentration of CO was measured by Raman scattering and by two-photon laser-induced fluorescence (TPLIF).

TEST CASE

Description of Experiment

The Application Challenge includes just one test case, Sandia Flame D with defined Reynolds number of the fuel jet and the fuel and pilot flame compositions as given in Table EXP-A.

Boundary Data

The inlet mean and fluctuating velocity at the distance x/D=1 from the burner are shown in Fig.3. The inlet parabolic profile had a maximum at the centre of the fuel nozzle of Umax = 62 m/s. The pilot flame bulk velocity Upilot = 11.4 m/s and the coflow velocity Ucfl = 0.9 m/s.

AC2-09 fig3a.gifAC2-09 fig3b.gif

Measurement Errors

The flow field measurement statistical errors are estimated in[1] as below 5% for the mean velocities and within 10% for fluctuating components. The scalar measurement errors are estimated and analyzed in[2]. The relative uncertainty (not including statistical noise or potential effects of spatial averaging) is estimated to be within 2% for the Raman measurements, 5% for OH, 5% for CO, and 10% for NO.

Measured Data

References

  1. 1.0 1.1 1.2 Schneider Ch., Dreizler A., Janicka J., Hassel E.P., "Flow field measurements of stable and locally extinguishing hydrocarbon-fuelled jet flames", Combustion and flames, 135, pp. 185-190, 2003
  2. Barlow R.S., Frank J.H., Proc. Comb. Inst., 27:1087,1998




Contributed by: Andrzej Boguslawski — Technical University of Częstochowa

Front Page

Description

Test Data

CFD Simulations

Evaluation

Best Practice Advice


© copyright ERCOFTAC 2024