Test Data AC2-09

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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. 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 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).

Table EXP-A Summary description of all test cases

Name	GNDPs	PDPs (Problem Definition Parameters)		MPs (Measured Parameters)
	Re	Fuel jet composition	Pilot flame composition	Detailed data	DOAPs
EXP1	22400	25% of methane (CH4) and 75% of air	C2H2, H2, air, CO2 and N2	$\langle U\rangle ,\langle U_{rms}\rangle ,\langle V\rangle ,\langle V_{rms}\rangle ,\langle \eta \rangle ,$ $\langle T\rangle ,\langle Y_{H_{2}0}\rangle ,\langle Y_{O_{2}}\rangle ,\langle Y_{N_{2}}\rangle ,\langle Y_{H_{2}}\rangle ,$ $\langle Y_{CO}\rangle ,\langle Y_{CO_{2}}\rangle ,\langle Y_{CH_{4}}\rangle ,\langle \eta _{rms}\rangle ,$ $\langle T_{rms}\rangle ,\langle Y_{{H_{2}O}_{rms}}\rangle ,\langle Y_{{O_{2}}_{rms}}\rangle ,$ $\langle Y_{{N_{2}}_{rms}}\rangle ,\langle Y_{{H_{2}}_{rms}}\rangle ,\langle Y_{{CO}_{rms}}\rangle ,$ $\langle Y_{{CO_{2}}_{rms}}\rangle ,\langle Y_{{CH_{4}}_{rms}}\rangle$	Axial profiles Tmax , z/D (Tmax ) Lconst(η , YCH4 , YO2) Lconst(YH2O , YCO2) YH2, max , z/D (YH2, max ) YCO, max , z/D (YCO, max ) RMSmax z/D (RMSmax ) Radial profiles x/D = 15, 30, 45 Fmax , Umax r½(η) , r½(U )

Table EXP-B Summary description of all measured parameters and available data files

MP1	MP2	MP3	DOAPs or other miscellaneous data

TEST CASE EXP1

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 U_max = 62 m/s. The pilot flame bulk velocity U_pilot = 11.4 m/s and the coflow velocity U_cfl = 0.9 m/s.

Fig. 3. Mean and RMS inlet profiles of the axial velocity.

Measurement Errors

The flow field measurement statistical errors are estimated in as below 5% for the mean velocities and within 10% for fluctuating components. The scalar measurement errors are estimated and analyzed in. 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.

References

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Contributed by: Andrzej Boguslawski — Technical University of Częstochowa

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