Analysis of Wall Impingement Spray and Film Formation Process in Direct Injection SI Engines under Low Temperature Conditions (Third Report)

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Bibliographic Information

Other Title
  • 低温環境下における直噴ガソリンエンジン用噴霧の壁面衝突と液膜形成過程の解明(第3報)
  • ‐ Effect of Distance between Spray and Wall on Liquid Film Adhesion Behavior‐
  • ‐ 噴霧‐壁面間の衝突距離が液膜付着挙動に与える影響 ‐

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Description

In direct injection spark ignition (DISI) engines, strict control of pollutant emissions at cold start is required to comply with new emission regulations. To clarify the effect of the impingement distance between the nozzle and the wall on the film formation process under low temperature conditions and the relationship between heat transfer and evaporation characteristics of the fuel film in an actual engine, total internal reflection laser induced fluorescence (TIR-LIF) method was applied to visualize the fuel film formation process. The parameters are 14mm, 28mm, 42mm, and 57 mm in wall impingement distance and the wall surface temperatures are 253 K and 293 K. As a result, the wall impingement distance increases, the momentum of the spray droplets just before impingement on the wall is smaller and it follows the gas flow in the spray more easily, resulting in a decrease in the amount of fuel adhesion on the wall. At a wall impingement distance of 14 mm, the amount of dispersion from the fuel film increases due to the large momentum of the spray droplets. In DISI engines, the fuel film easily residual in the intake process due to the reduction of heat transfer from gas to liquid and increase in heat require for evaporation of the fuel film at the earlier injection timing.

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Details 詳細情報について

  • CRID
    1390015410760494592
  • DOI
    10.11351/jsaeronbun.54.711
  • ISSN
    18830811
    02878321
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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