Time-Dependent Lagrangian Mixing Process in Turbulent Diffusion Flames observed using Ultrahigh-Speed Video System.

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Bibliographic Information

Other Title
  • 超高速ビデオシステムによるラグランジュ的時系列乱流拡散火炎混合過程の実験的研究
  • チョウコウソク ビデオ システム ニヨル ラグランジュテキ ジケイレツ ランリ
Published
1995
DOI
  • 10.1299/kikaib.61.3329
Publisher
The Japan Society of Mechanical Engineers

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Description

Space- and time-resolved information, as well as macro- and microscopic visualizations, is essential for detailed study of mixing, reaction and heat transfer mechanisms in a turbulent diffusion flame. However, turbulent diffusion flame structures have been studied almost solely by time-resolved single-point measurement due to the restriction of diagnostics. The time-dependent spatial structures of turbulent diffusion flames have often been masked by the statistical analyses. In this study, time-dependent spatial mixing processes in turbulent diffusion flame are visualized by instantaneous flame luminosity and plane Mie scattering images by an ultrahigh-speed video system (Fastcam). It is found that the autosimilarity of the instantaneous turbulent diffusion flame structure has a fractal dimension defined by fractal analysis which appears corresponding to the fractal analysis of the combustion region. Macroscopic movements of the flame region are classified in terms of the instantaneous variations of flame shape.

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