Abstract:Nitric oxide (NO) produced during combustion will be present in vitiated air used in many devices. An experimental and modeling investigation of the effect of NO on the ignition of C1–C3 hydrocarbon fuels, namely, CH4, C2H4, C2H6, and C3H6, is presented. These molecules are important intermediate species generated during the decomposition of long-chain hydrocarbon fuel components typically present in jet fuels. Moreover, CH4 and C2H6 are major components of natural gas fuels. Although the interaction between N… Show more
“…Therefore, NO2 can be an excellent sink for resonantly stabilized radicals in combustion and atmospheric environments. Our experimentally determined rate coefficients agree reasonably well with the rates used in the recent work of Gokulakrishnan et al [5] (see Fig. S3 in Supplementary Material).…”
Section: Discussionsupporting
confidence: 88%
“…However, the presence of NOx has been found to accelerate the autoignition behavior of propene and other hydrocarbons. Gokulakrishnan et al [5] highlighted the importance of C3H5 + NO2 → C3H5O + NO and NO + HO2 → NO2 + OH reactions in governing the oxidation kinetics of propene.…”
Section: Introductionmentioning
confidence: 99%
“…The kinetics of these reactions has importance for several reasons: i) NOx is present in considerable amounts in many practical oxidizer systems either due to thermal NOx formation or due to the exhaust gas recirculation strategies [5],…”
“…Therefore, NO2 can be an excellent sink for resonantly stabilized radicals in combustion and atmospheric environments. Our experimentally determined rate coefficients agree reasonably well with the rates used in the recent work of Gokulakrishnan et al [5] (see Fig. S3 in Supplementary Material).…”
Section: Discussionsupporting
confidence: 88%
“…However, the presence of NOx has been found to accelerate the autoignition behavior of propene and other hydrocarbons. Gokulakrishnan et al [5] highlighted the importance of C3H5 + NO2 → C3H5O + NO and NO + HO2 → NO2 + OH reactions in governing the oxidation kinetics of propene.…”
Section: Introductionmentioning
confidence: 99%
“…The kinetics of these reactions has importance for several reasons: i) NOx is present in considerable amounts in many practical oxidizer systems either due to thermal NOx formation or due to the exhaust gas recirculation strategies [5],…”
“…At around 16 atm and 1140 K (Figure 5c), the reductions are 56.5% (N 25 ), 67.4% (N 50 ), and 73.5% (N 75 ). The addition of NO 2 to C 2 H 6 has more pronounced effects at As motivated by a recent work, 34 we also examine the effect of NO 2 concentrations (0−14865 ppm) on CH 4 ignition at 10 atm, and the result is shown in Figure 6a. The NO 2 addition leads to a significant reduction in the ignition delay time, consistent with a previous study.…”
Ignition delay times of stoichiometric CH 4 /NO 2 /O 2 /Ar, C 2 H 6 /NO 2 /O 2 /Ar, and CH 4 /C 2 H 6 /NO 2 /O 2 /Ar mixtures are measured with a shock tube to investigate the role of NO 2 in ignition of methane, ethane, and natural gas (CH 4 / C 2 H 6 = 9:1). All measurements are carried out at 1016−1981 K and 5−16 atm. Different NO 2 concentrations (0, 25, 50, and 75% of fuel molar concentrations) are explored. The addition of NO 2 promotes considerably the ignition of methane and natural gas but moderately for ethane. In addition, the promoting effect is temperature-dependent. Four assembled models are examined against the present measurements, and an updated kinetic model is proposed and validated in comparison to the experimental data. The current model is chosen for sensitivity and reaction pathway analyses, which reveal the role of NO 2 in ignition of methane, ethane, and natural gas.
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