Numerical modelling of turbulent catalytically stabilized channel flow combustion

Mantzaras, John; Appel, Christoph; Benz, P.; Dogwiler, Urs

doi:10.1016/s0920-5861(00)00268-6

Cited by 38 publications

(27 citation statements)

References 31 publications

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“…Favre-averaged modeled transport equations were solved for the continuity, momentum, and all first-and second-order scalar moments (mean values, variances, and covariances of the species mass fractions and the total enthalpy; see Ref. [11]). The transport equation for every gaseous variable u was…”

Section: Thermochemistry Modelingmentioning

confidence: 99%

“…The mean heterogeneous reaction rates were then treated with a laminar-like closure [11], evaluated at their corresponding mean values,…”

Section: Thermochemistry Modelingmentioning

confidence: 99%

“…2 e 2m(‫ץ‬ k/‫ץ‬y) Ί Finally, zero-Neumann boundary conditions [11] were applied at the plane of symmetry ( y ‫ס‬ 3.5 mm) and the outlet (x ‫ס‬ 250 mm).…”

Section: Numerical Approachmentioning

confidence: 99%

“…Most entry channel flow models have, therefore, focused on low Reynolds number (LR) variants of k-e turbulence models. Numerical modeling of the underlying hetero-/homogeneous processes in turbulent channel flows-with emphasis on homogeneous ignition-was reported recently in Mantzaras et al [11].…”

Section: Introductionmentioning

confidence: 99%

“…The numerical predictions included three LR turbulence models in conjunction with the thermochemistry model developed in Ref. [11].…”

Section: Introductionmentioning

confidence: 99%

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An experimental and numerical investigation of turbulent catalytically stabilized channel flow combustion of hydrogen/air mixtures over platinum

Appel

Mantzaras

Schaeren

et al. 2002

Proceedings of the Combustion Institute

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The turbulent catalytically stabilized combustion (CST) of fuel-lean hydrogen/air mixtures over platinum was investigated experimentally and numerically in channel-flow configurations. Experiments were performed in an optically accessible catalytic channel reactor, established by two Pt-coated ceramic plates 300 mm long and placed 7 mm apart, with incoming Reynolds numbers of 15,000 and 30,000. Planar laserinduced fluorescence of the OH radical was used to monitor the onset of homogeneous (gas-phase) ignition, one-dimensional (across the 7 mm transverse direction) Raman measurements of major species and temperature assessed the turbulent scalar transport, laser doppler velocimetry yielded the inlet velocity and turbulence, and thermocouples embedded beneath the catalyst provided the surface temperature distribution. Computations were carried out with a two-dimensional elliptic fluid mechanical code that included elementary heterogeneous and homogeneous chemical reaction schemes. Three different low-Reynolds number near-wall turbulence models were examined, in conjunction with a thermochemistry model that included a presumed-shape (Gaussian) probability density function approach for the gaseous reactions and a laminar-like closure for catalytic reactions. Comparisons between predictions and measurements have shown that key CST issues, such as catalytic fuel conversion and onset of homogeneous ignition, are strongly dependent on the particular turbulence model. Moreover, the discrepancies between predictions and measurements were ascribed to the capacity of the various turbulence models to capture the strong flow laminarization induced by the heat transfer from the hot catalytic surfaces. A turbulence model that yields good agreement with the measurements is presented as particularly suited for CST. Experiments and predictions have shown that a continuous increase of the turbulent transport led to incomplete combustion through the gaseous reaction zone with subsequent catalytic conversion of the leaked fuel and, finally, to extinction of the gaseous flame.

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Section: Thermochemistry Modelingmentioning

confidence: 99%

“…The mean heterogeneous reaction rates were then treated with a laminar-like closure [11], evaluated at their corresponding mean values,…”

Section: Thermochemistry Modelingmentioning

confidence: 99%

“…2 e 2m(‫ץ‬ k/‫ץ‬y) Ί Finally, zero-Neumann boundary conditions [11] were applied at the plane of symmetry ( y ‫ס‬ 3.5 mm) and the outlet (x ‫ס‬ 250 mm).…”

Section: Numerical Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The numerical predictions included three LR turbulence models in conjunction with the thermochemistry model developed in Ref. [11].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations