A203 40眼カメラとCT法による瞬間三次元分布計測手法

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  • New Three-Dimensional Measurement Technique using Multi-Lens Camera and CT method
  • 40ガン カメラ ト CTホウ ニ ヨル シュンカン 3ジゲン ブンプ ケイソク シュホウ ランリュウ ヨ コンゴウ カエン ノ キド ブンプ ノ ケイソク
  • Measurement of Instantaneous Distribution of Light Emission of Turbulent Premixed Flame
  • 乱流予混合火炎の輝度分布の計測

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The advanced CT (computerized tomography) reconstruction technique for measuring an instantaneous three-dimensional distribution of chemiluminescence of a turbulent premixed flame is accomplished. In the technique, first, instantaneous two-dimensional images (projections) of an objective flame are simultaneously taken from forty horizontal directions with a forty-lens camera. Next 550 horizontal CT images, which are reconstructed from the projections by MLEM (maximum likelihood expectation maximization) algorithm, are vertically accumulated, resulting in an instantaneous three-dimensional distribution of flame-chemiluminescence. Results for a propane-air fuel-rich-premixed turbulent flame are as follows. The flame front is observed to be a thin wrinkled luminous region of 0.6mm in thickness. The three-dimensional result clearly shows that the cusps observed in horizontal cross-sections correspond to ridges of the three-dimensional flame front. The luminosity is quenched at the ridges by Lewis number effect. Finally, various types of display of three-dimensional distribution are performed to demonstrate the three-dimensionality of data acquisition.

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