Investigation of the Effects of Vitiated Conditions on the Autoignition of JP-8

Fuller, Casey; Gokulakrishnan, P.; Klassen, Michael S.; Roby, Richard J.; Kiel, Barry

doi:10.2514/6.2009-4925

Cited by 8 publications

(11 citation statements)

References 8 publications

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“…The chemical composition of typical vitiated air consists of combustion products such as CO 2 , H 2 O, CO and NO x under reduced O 2 levels. Previous work by the authors [8,9] showed that NO x and O 2 had significant impact on the induction chemistry of JP-8 compared to other vitiated species such as CO 2 and H 2 O. Therefore, in the current work, experiments were performed by varying NO and O 2 concentrations in the oxidizer stream along with temperature and equivalence ratio to study the effect of vitiation on the autoignition of alternative JP-8 fuels relative to conventional JP-8.…”

Section: Dimensions Are In Millimetersmentioning

confidence: 96%

“…The presence of combustion products in the inlet oxidizer stream has been found to influence the combustion chemistry of hydrocarbon fuels. In particular, the presence of NO x has an effect on induction chemistry [7,8,9], and CO 2 and H 2 O affect the flame propagation [7,10]. A previous study applying a three-level fractional factorial design of experiments by the authors [8] demonstrated that the presence of NO x in the vitiated air has significant influence on the ignition delay time of JP-8.…”

Section: Introductionmentioning

confidence: 96%

“…In particular, the presence of NO x has an effect on induction chemistry [7,8,9], and CO 2 and H 2 O affect the flame propagation [7,10]. A previous study applying a three-level fractional factorial design of experiments by the authors [8] demonstrated that the presence of NO x in the vitiated air has significant influence on the ignition delay time of JP-8. A seven-variable, three-level Box-Behnken design of experiments was performed to investigate the effect of vitiation on JP-8 ignition between 950 K and 1125 K [8].…”

Section: Introductionmentioning

confidence: 96%

“…Previous flow reactor ignition delay time measurements [8,9] showed that a small amount of NO x (50-900ppm) can significantly reduce the ignition delay time of JP-8 under atmospheric and sub-atmospheric pressure conditions. The primary objective of the current work is to investigate the effect of NO x on alternative JP-8 fuels produced from natural gas via the Fischer-Tropsch (FT) process and from fatty oils via hydrotreatment techniques (forming renewable jet (HRJ) fuels).…”

Section: Introductionmentioning

confidence: 98%

“…A previous study applying a three-level fractional factorial design of experiments by the authors [8] demonstrated that the presence of NO x in the vitiated air has significant influence on the ignition delay time of JP-8. A seven-variable, three-level Box-Behnken design of experiments was performed to investigate the effect of vitiation on JP-8 ignition between 950 K and 1125 K [8]. The experimental variables were temperature, equivalence ratio, and vitiated air composition (i.e., O 2 , H 2 O, CO, CO 2 , and NO x ).…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Ignition Characteristics of Alternative Jet Fuels under Vitiated Conditions

Gokulakrishnan¹,

Fuller²,

Klassen³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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Atmospheric pressure flow reactor experiments were performed to investigate the ignition characteristics of Fischer-Tropsch and hydrotreated renewable JP-8 fuels under vitiated conditions in order to compare these properties to conventional JP-8. Ignition experiments were conducted with reactor temperatures between 832 K and 917 K with standard air as well as vitiated air with 17% O 2 and NO x levels varied between 0 and 755 ppmv. Experiments were also performed with jet fuel surrogate components such as n-dodecane and iso-octane to investigate the ignition behavior of normal-and iso-paraffins, respectively. Experimental measurements show that the presence of NO x in the oxidizer stream reduces the ignition delay time of jet fuels and surrogates significantly. Furthermore, the effect of NO x on iso-octane ignition delay time is more pronounced than for n-dodecane. Surrogate kinetic modeling results are also compared with the experimental data regarding the effect of NO x . Overall, the modeling results agree with trends observed for the effect of NO x on ignition delay time. However, the ignition delay time predictions for Sasol-IPK are much longer than the experimental data. This is due to the fact that the representation of isoparaffinic components in Sasol-IPK is not correctly represented by iso-octane alone.

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Section: Dimensions Are In Millimetersmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Ignition Characteristics of Alternative Jet Fuels under Vitiated Conditions

Gokulakrishnan¹,

Fuller²,

Klassen³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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An experimental and kinetic study the effect of nitrogen dioxide addition on autoignition of n-heptane

Shi

Chen

Zheng

et al. 2021

Combustion and Flame

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Experimental and Modeling Study of C1–C3 Hydrocarbon Ignition in the Presence of Nitric Oxide

Gokulakrishnan

Fuller

Klassen

2017

Journal of Engineering for Gas Turbines and Power

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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 NOx and CH4 has been studied extensively, limited experimental work is reported on C2H4, C2H6, and C3H6. As a continuation of previous work with C3H8, ignition delay time (IDT) measurements were obtained using a flow reactor facility with the alkanes (CH4 and C2H6) and olefins (C2H4 and C3H6) at 900 K and 950 K temperatures with 15 mole% and 21 mole% O2. Based on the experimental data, the overall effectiveness of NO in promoting ignition is found to be: CH4 > C3H6 > C3H8 > C2H6 > C2H4. A detailed kinetic mechanism is used for model predictions as well as for reaction path analysis. The reaction between HO2 and NO plays a critical role in promoting the ignition by generating the OH radical. In addition, various important fuel-dependent reaction pathways also promote the ignition. H-atom abstraction by NO2 has significant contribution to the ignition of C2H4 and C2H6, whereas the reaction between NO2 and allyl radical (aC3H5) is an important route for the ignition of C3H6.

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Investigation of the Effects of Vitiated Conditions on the Autoignition of JP-8

Cited by 8 publications

References 8 publications

Ignition Characteristics of Alternative Jet Fuels under Vitiated Conditions

Ignition Characteristics of Alternative Jet Fuels under Vitiated Conditions

An experimental and kinetic study the effect of nitrogen dioxide addition on autoignition of n-heptane

Experimental and Modeling Study of C1–C3 Hydrocarbon Ignition in the Presence of Nitric Oxide

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