The Role of Diffusive Transport on Low and Intermediate Temperature Hydrocarbon Oxidation: Closed Reactor Experiments Using Equimolar n–C4H10 + O2Premixtures at Reduced-Gravity

Pearlman, Howard; Foster, Michael R

doi:10.1080/00102200701600960

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…Note that the rate parameters were tuned for acetaldehyde oxidation. As mentioned, the model has been shown to successfully predict modes of slow reaction, oscillatory cool flames, two-stage ignitions, complex oscillations and high-temperature ignition, which are qualitatively similar to those observed in C 3 and higher molecular weight alkanes, including n-butane, which is reported in a separate experimental study (Pearlman and Foster, 2008). The x and y species conservation equations including diffusive fluxes of species can be written as:…”

Section: Methodsmentioning

confidence: 82%

The Role of Diffusive Transport on Low and Intermediate Temperature Hydrocarbon Oxidation: Numerical Simulations Using the Wang-Mou Mechanism

Pearlman

Foster

2007

Combustion Science and Technology

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The spatio-temporal temperature and species concentration distributions associated with low and intermediate temperature hydrocarbon oxidation are computed using a global thermokinetic scheme augmented with diffusive transport. The scheme used for the computations was proposed by Wang and Mou and is extended to include diffusion of species and heat. The conservation equations for species and energy are then derived and solved for a one-dimensional and an axisymmetric, spherical domain for temperatures ranging from 540 to 660 K at subatmospheric pressures. The predictions are then used to develop ignition diagrams for different Lewis (Le) numbers. Increasing Le is found to promote oscillatory cool flames and two-stage ignition in the one-dimensional model, while the ratio of the mass diffusivity of the parent fuel to that associated with the autocatalytic chain carrier has a negligible effect on the structure of the ignition diagrams. In the spherical model, oscillatory cool flames and two-stage ignition were also predicted albeit at lower values of the Le.

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Section: Methodsmentioning

confidence: 82%

The Role of Diffusive Transport on Low and Intermediate Temperature Hydrocarbon Oxidation: Numerical Simulations Using the Wang-Mou Mechanism

Pearlman

Foster

2007

Combustion Science and Technology

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“…Regarding cool flame studies, reduced gravity experiments have been performed aboard NASA's KC-135 aircraft at different gravity levels (different Ra's) (Foster and Pearlman 2006a;Foster 2006), and CFD studies that include reaction, diffusion, and convection have been developed using global kinetic schemes. The schemes include the two-step Sal'nikov mechanism (Campbell et al 2005b(Campbell et al , 2006, the Gray-Yang mechanism (Pearlman et al 2003;Foster and Pearlman 2006a, b;Foster 2006), and the Wang-Mou mechanism (Cardoso et al 2004a, b;Campbell et al 2005aCampbell et al , b, 2006Foster 2007;Pearlman and Foster 2008). In addition, Fairlie et al (2005) have taken their reduced mechanism for low-temperature propane oxidation added diffusion of species and heat and used it to compute the spatial and temporal evolution of the temperature and species concentration profiles in an unstirred reactor.…”

Section: Introductionmentioning

confidence: 99%

“…scheme that is based on the Gray-Yang model and shown to capture modes of slow reaction, cool flames, and ignition (Foster 2007;Pearlman and Foster 2008). The mechanism has five-steps that include initiation, high-temperature branching, low-temperature branching, high-temperature termination, and low-temperature termination steps (Wang and Mou 1985;Liang et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Non-Isothermal Cool Flames in Unstirred Static Reactors: A Compressible Model with Global Kinetics

Foster

Pearlman

2012

Microgravity Sci. Technol.

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A compressible model is developed with kinetics based on the Wang-Mou five-step global kinetic scheme and used to evaluate the temperature, concentration, and velocity fields characteristic of lowtemperature combustion in unstirred static reactors. This work relaxes the assumption of small exothermicity that enabled prior studies to employ the Boussinesq approximation, valid for cases where β T << 1, i.e., slow reactions and cool flames. In this study, the range of validity of the model is extended to cases with large temperature excursions, including multi-stage ignition. For the weakly exothermic cases considered, including modes of slow reaction and cool flames, the Boussinesq approximation is completely adequate. However, it overpredicts the density change and underpredicts the ignition delay time for high-temperature ignitions. Qualitative comparison with experimental results acquired at microgravity conditions are also discussed.

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The Role of Diffusive Transport on Low and Intermediate Temperature Hydrocarbon Oxidation: Closed Reactor Experiments Using Equimolar n–C₄H₁₀ + O₂Premixtures at Reduced-Gravity

Cited by 2 publications

References 11 publications

The Role of Diffusive Transport on Low and Intermediate Temperature Hydrocarbon Oxidation: Numerical Simulations Using the Wang-Mou Mechanism

The Role of Diffusive Transport on Low and Intermediate Temperature Hydrocarbon Oxidation: Numerical Simulations Using the Wang-Mou Mechanism

Non-Isothermal Cool Flames in Unstirred Static Reactors: A Compressible Model with Global Kinetics

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