On Modeling of Quenching Phenomena by Numerical Data of Counterflow Diffusion Flames.

進, 野田; 友紀, 坪倉

doi:10.1299/kikaib.68.926

Cited by 1 publication

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“…On the other hand, Buckmaster (26) suggests that the extinction strain rate of the flame edge is modified to reduce the extinction value obtained by a uniformly strained counter nonpremixed flame due to the decrease in the extinction Damköhler number at the edge. This modification is also confirmed by Shay and Ronney (27) and Noda and Tsubokura (28) . The present results may provide evidence of the prediction of Buckmaster.…”

Section: Pdfs Of Scalar Dissipation Ratesupporting

confidence: 70%

Nonpremixed Flamelet Statistics at Flame Base of Lifted Turbulent Jet Nonpremixed Flames

Noda

Mori

Hongo

et al. 2005

JSME international journal. Ser. B, Fluids and thermal engineer

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Nonpremixed flamelet statistics at the flame base of lifted turbulent nonpremixed flames are investigated experimentally using a planar temperature Rayleigh scattering method. A methane/hydrogen mixture is supplied from a tube of 3.2 mm I.D. into the surrounding air flow so as to form two lifted turbulent nonpremixed flames having exit velocities of 50 m/s (Re = 4 200) and 80 m/s (Re = 6 700), respectively. Temperature data are related to maximum temperature at several flame positions based on the instantaneous flame base tip as containing information on the reaction region of each nonpremixed flamelet at each position. The statistics in terms of maximum temperature, thermal dissipation rate, scalar dissipation rate, and flame brush are discussed with reference to the modeling of the flame base structure. The scalar dissipation rate has log-normal statistics and the quenching scalar dissipation rate is lower than the critical value predicted using the uniformly strained counter nonpremixed flame. These statistics are compared to those obtained using a model proposed by Müller et al.(1) , which combines the flamelet model and the scalar field variable to predict lifted turbulent nonpremixed flames. The comparison has shown that the model can qualitatively predict lifted turbulent nonpremixed flames, but modification is required in order to obtain more accurate quantitative prediction taking into account the edge flame structure, the statistics of scalar dissipation rate, and the statistics of flame brush.

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Section: Pdfs Of Scalar Dissipation Ratesupporting

confidence: 70%