ディーゼル機関からのすす濃度の自動測定器の開発 Research Development of Automatic Measuring Instrument for Soot Concentration from Diesel Engines

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The control of soot emission from the diesel engine have been one of the important subjects because the soot plays an important role in relation to air pollution.<BR>The measuring of soot concentration on real time is not well established. Considerable understanding of soot concentration have been achieved by the measurements of mass concentration of soot from diesel engines by means of probe sampling methods (JIS type etc.) . Developments of the optical measuring system, in order to get a more detailed understanding of soot concentration in exhaust tube on real time, come up as an important problem.<BR>The form of soot particles in the exhaust tube seems to be monodispersive and spherical or clusterlike, such as long chain polymer molecules. It assume that the form and number density of soot particles become a state of volume mean diameter.<BR>This system have been made using the laser-light scattering and attenuation techniques by the G. Mie's theory to make clear the diameter and number density of soot particles. A50 (mW) helium-neon laser emitting monochromatic radiation at a wavelength of 632.8 (nm) is used as the light source. An incident light beam from the light source is composite beam of the vertical (i<SUB>1</SUB>) and horizontal (i<SUB>2</SUB>) polarization components.<BR>The diameter of soot particle can be determined from the intensities ratio of both integral scattered light from soot particles.<BR>i is the intensity of the scattered light. It's value is defined as [60°∫40° (i<SUB>1</SUB>+i<SUB>2</SUB>) dθ/140°∫120° (i<SUB>1</SUB>+i<SUB>2</SUB>) dθ], θis the scattring angle. The soot refractive index of m=1.85-I⋅0.475 proposed by Lee and Tien is selected, mass per unit volume of soot is assumed ρ<I><SUB>s</SUB></I>=2.0 (g/m<SUP>3</SUP>)<BR>The results are as follows. At fuel flow is 0.75 (L<I><SUB>N</SUB></I>/min), The volume mean diameter (Ds) of soot particles in the exhaust tube lie between 200 and 230 (nm) . The total mean diameter is about 214 (nm) .<BR>The number density and mass concentration of soot particles are estimated to be about 1.90×10<SUP>6</SUP> (particles/cm<SUP>3</SUP>) and 0.02 (g/m<SUP>3</SUP>), respectively. The mass concentration is no significant difference between the results of optical method and filter system.

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  • 日本舶用機関学会誌  

    日本舶用機関学会誌 31(10), 764-774, 1996-10-01 

    The Japan Institute of Marine Engineering

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各種コード

  • NII論文ID(NAID)
    10002041244
  • NII書誌ID(NCID)
    AN00196373
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03883051
  • NDL 記事登録ID
    4056613
  • NDL 雑誌分類
    ZN24(科学技術--運輸工学--船舶)
  • NDL 請求記号
    Z16-747
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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