Flame structure measurements of NO in premixed hydrogen–nitrous oxide flames

Powell, Orval; Papas, Paul; Dreyer, Christopher B.

doi:10.1016/j.proci.2010.06.042

Cited by 20 publications

(21 citation statements)

References 28 publications

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“…Details concerning the burner and LIF setups are available elsewhere [3,4,9] and will only be discussed briefly here. Laminar premixed fuel-nitrous-oxide flames at near-atmospheric pressure (0.81 atm) were stabilized on a McKenna-type burner for saturated LIF studies with nitrogen shroud gas flow introduced around the burner circumference [3].…”

Section: Methodsmentioning

confidence: 99%

“…The simulation values were performed in the saturated regime at the peak, corrected flame temperature (1700 K) at a resolution (line width) of 0.01 nm, providing an experimental estimate for the actual line width. This shows that the hardware would likely produce contributions from adjacent transitions when exciting the Q 2 26:5 and Q 1 22:5 transitions [4]. However, the hardware could capture and resolve the Q 1 26:5 transition; thus, it was selected for use with the detection scans, indicated by the encircled peak in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…In their NO, laser Table 1 Comparison of NO mole fractions (ppm) predicted using three mechanisms (PPD [3,4,9], Konnov [23], and Glarborg [24,25]), and the current work for CH 4 [4,9,36]; dashed lines: predictions using the Konnov mechanism [23]; and dotted lines: predictions using the Glarborg mechanism [24,25].…”

Section: Methodsmentioning

confidence: 99%

“…They conducted saturation measurements of the NO A 2 X 2 0; 0 Q 2 26:5 transition at approximately 1 mJ per pulse with a focal volume diameter of 250 m, yielding a spectral irradiance for saturation of 1:2 10 7 W=cm 2 cm 1 [19]. The current detection scans of the Q 1 26:5 transition were conducted at nominally 1.4 mJ per pulse with a focal volume diameter of 370 m [9] or a laser spectral irradiance of about 2:6 10 8 W=cm 2 cm 1 at a minimum, indicating likely operation in the saturated regime [4]. Because of imperfections of the burner surface, vertical positions above the burner surface were offset by 0.2 mm.…”

Section: Methodsmentioning

confidence: 99%

“…These studies provide a foundation into the combustion characteristics of hydrocarbon-nitrous-oxide systems and show that reactions containing N x H y species play a significant role in accurately modeling species profiles [1] and flame speeds [2,3]. However, studies on the reaction characteristics of hydrocarbonnitrous-oxide mixtures are limited or have involved mixtures with hydrogen and other fuels [4].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Flame Structure Measurements of Nitric Oxide in Hydrocarbon-Nitrous-Oxide Flames

Powell

Papas²

2012

Journal of Propulsion and Power

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Experimental NO flame profiles were measured for N 2 -diluted, CH 4 -, C 2 H 2 -, and C 3 H 8 -N 2 O premixed flames stabilized on a flat flame apparatus at stoichiometric proportions. The NO measurements were obtained using laserinduced fluorescence in the saturated region and calibrated by microprobe postflame sampling using Fourier transform infrared spectroscopy. These experimental data were compared to predictions using a burner-stabilized flame model using three different published chemical mechanisms. Compared to the Fourier transform infrared results, the NO model predictions using the chemical mechanisms varied depending on the mechanism and the fuel. For example, for the CH 4 flame, all three predictions fell within the Fourier transform infrared uncertainty, whereas only the Glarborg mechanism is within the Fourier transform infrared uncertainty for the C 2 H 2 flame. The normalized, spatial NO profile predictions for all three chemical mechanisms showed reasonable agreement with the normalized experimental NO profiles in the postflame region; however, there was appreciable disparity between the experimental and model predictions of the spatial location of the peak NO mole fraction above the burner surface. Sensitivity and rate-of-production analyses showed that NH x =NO chemical interactions are important to accurately model NO profiles in hydrocarbon-nitrous-oxide flames. The experimental data provided additional constraints for the rate constants of important NH x =N x H y chemical interactions, and some modifications were considered for improving comparisons between model predictions and experiments.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%