------------------------------------------------------------ USER INSTRUCTIONS ------------------------------------------------------------- This data set contains: - In-situ flame temperature measurements data - Species concentrations measurements in the exhausted gas - Ensemble-averaged OH* and CH* radicals chemiluminescence spatially resolved intensity values The experimental data have been collected in a semi-industrial furnace, fed with H2/CH4/CO fuel mixtures doped with C6H6. The experimental set-up is available at Aero-Thermo-Mechanics (ATM) department at Université Libre de Bruxelles (ULB). For the experimental set-up details refer to: Sharma, S., Savarese, M., Coussement, A., & Parente, A. (2022). Decarbonisation potential of dimethyl ether/hydrogen mixtures in a flameless furnace: Reactive structures and pollutant emissions. International Journal of Hydrogen Energy. https://doi.org/10.1016/j.ijhydene.2022.10.104 However, in this experimental campaign, the following choices were made: - The burner was operated only in Flame combustion mode - Air ID= 25 mm < Diameter of air injection nozzle > - Pin= 20 kW < Total thermal input power to the furnace > - Pcool=7.7-8.9 kW < Cooling power extracted from the furnace > The fuel compositions tested and the experimental operating conditions are summarized below: %% Fuel mixture composition %% H2[% v/v] CH4[% v/v] CO[% v/v] C6H6 [%v/v] LHV [MJ/Nm3] 68.68 25.34 5.98 0.00 17.242 68.34 25.21 5.95 0.50 17.86 67.91 25.06 5.91 1.12 18.63 67.31 24.83 5.86 2.00 19.73 66.62 24.58 5.80 3.00 20.97 65.25 24.07 5.68 5.00 23.45 %% Experimental operating conditions %% C6H6 [%v/v] Qfuel[Nm3/h] Qair[Nm3/h] Eq.ratio,Φ [-] Air excess,e [%] 0 4.180 21.88 0.80 25 0.5 4.031 21.91 0.80 25 1.12 3.864 21.95 0.80 25 2 3.650 22.00 0.80 25 3 3.434 22.05 0.80 25 5 3.070 22.13 0.80 25 __________________________________________________________________________________ 0 4.180 19.26 0.91 10 0.5 4.031 19.28 0.91 10 1.12 3.864 19.31 0.91 10 2 3.650 19.36 0.91 10 3 3.434 19.40 0.91 10 5 3.070 19.48 0.91 10 ___________________________________________________________________________________ 0 4.180 17.50 1.00 0 0.5 4.031 17.53 1.00 0 1.12 3.864 17.56 1.00 0 2 3.650 17.60 1.00 0 3 3.434 17.64 1.00 0 5 3.070 17.70 1.00 0 ____________________________________________________________________________________ 0 4.180 16.63 1.05 -5 0.5 4.031 16.65 1.05 -5 1.12 3.864 16.68 1.05 -5 2 3.650 16.72 1.05 -5 3 3.434 16.76 1.05 -5 5 3.070 16.82 1.05 -5 ____________________________________________________________________________________ 0 4.180 15.93 1.10 -9 0.5 4.031 15.95 1.10 -9 1.12 3.864 15.98 1.10 -9 2 3.650 16.01 1.10 -9 3 3.434 16.05 1.10 -9 5 3.070 16.11 1.10 -9 _____________________________________________________________________________________ 0 4.180 14.58 1.20 -16.7 0.5 4.031 14.60 1.20 -16.7 1.12 3.864 14.63 1.20 -16.7 2 3.650 14.66 1.20 -16.7 3 3.434 14.69 1.20 -16.7 5 3.070 14.75 1.20 -16.7 %% NOTES for the In-situ Flame Temperature measurements %% - The in-situ flame temperature measurements were performed by using an air-cooled suction pyrometer probe equipped with a B-type thermocouple. - The measurements were carried out at different positions in the combustion chamber. The sampling points are labelled in this data-set by adopting a x-y axis system. The center is set in correspondence of the central axis of the combustion chamber and the exit plane of the air-fuel nozzle (x=0, y=0). Vertical positions (y= 70,100, 150, 200, 250, 300, 400, 500 mm) < Distance from the exit plane of the air-fuel nozzle > Radial positions (x=0, 10, 15, 20, 30, 40, 60, 100 mm) < Distance from the central axis> - The standard deviations of the measurements sampled over the acquisition time are also reported for all the measured temperatures. - The maximum uncertainty on the measured flame temperatures was estimated at ±20K (±1%). - The flame temperatures are expressed in degrees Celsius. %% NOTES on the Species concentrations measurements in the exhaust gas %% - The exhaust gas composition was monitored by means of Fourier Transform Infrared Spectroscopy (FTIR) analyser from HORIBA® (HORIBA MEXA-ONE), equipped with a paramagnetic analyzer (MPA) for O2 measurements. - The species concentrations provided in this data-set are expressed in ppmv. - The standard deviations of the measurements sampled over the acquisition time are also reported for all the species concentrations. - The maximum uncertainties estimated over the investigated equivalence ratios are the following ones: CO (±0.20 %vol) CO2 (±0.39. %vol) H2O (±0.40 %vol) O2 (±0.60 %vol) NO (±19.65 ppmv) for measured NO concentrations higher than 200 ppmv NO (±5.56 ppmv) for measured NO concentrations lower than 200 ppmv NO2 (±3.93 ppmv) N2O (±3.92 ppmv) CH4 (±9.90 ppmv) C2H4 (±9.80 ppmv) %% NOTES on Ensemble-averaged OH* and CH* radicals chemiluminescence spatially resolved intensity values - OH* and CH* chemiluminescence imaging was carried out by means of an IRO (Intensified Relay Optics) and a CCD (Charge-Coupled Device) camera 1.4 M (La Vision 1392 x 1040 pixels) coupled with UV 78mm f/3.8 lens and two interferential filters to collect the chemiluminescence emitted by OH* (310 ± 10 nm) and CH* (438 ± 24 nm). - The image intensifier gain was set at 70, and it was coupled with a multi-shot technique, which allowed to capture 1000 frames of each case at a global acquisition frequency of 17 Hz. - The gate (time between two successive bursts) was set to 999100 μs. Averaged images were then extracted for each tested mixture in this experimental campaign. - The final ensemble-averaged OH* and CH* chemiluminescence intensity values are located on the symmetry plane with the following coordinates: x= [-40:40], y=[40:230]