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A comparison of the velocity and scalar spectra in premixed turbulent flames

✍ Scribed by R.K. Cheng; I.G. Shepherd; I. Gökalp

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
970 KB
Volume
78
Category
Article
ISSN
0010-2180

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✦ Synopsis

Frequency spectra for scalar (progress variable ~) and two velocity components in premixed methane-air turbulent vflames and stagnation flow-stabilized flames have been measured using laser light Mie scattering and laser Doppler anemometry techniques. To assist in interpreting the influence of flame crossing phenomenon on the scalar spectra, theoretical predictions of the e spectra developed by Bray-Libby-Moss and by Bray-Libby were evaluated. The spectral slopes and most energetic frequencies of the scalar spectra were compared with those of the velocity components normal and tangential to the turbulent flame brush. In both configurations, the spectra of the normal velocity components are similar to the corresponding scalar spectra, demonstrating the coupling between velocity and scalar spectra. However, the most energetic frequencies, which are related to the flame crossing frequencies, are

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