Analysis of Wall Impingement Spray and Film Formation Process in Direct Injection SI Engines under Low Temperature Conditions (Second 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2報)
  • ‐ Effect of low temperature of fuel film on the amount of film deposition in wall impingement spray ‐
  • ‐ 燃料液膜の低温化が壁面衝突噴霧の液膜付着質量に与える影響 ‐

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Description

In direct injection spark ignition engines, PM reduction under cold conditions is important, and controlling liquid film adhesion by spray wall interaction is a key issue. In this study, to control the amount of liquid film adhesion by wall impinging spray, fuel film analysis method was developed applying the total internal reflection laser induced fluorescence (TIR-LIF) method, which can estimate the film thickness and the film temperature those change unsteadily during the film formation process. Decrease in fuel temperature and wall temperature increases the We number of spray droplets, which increases the amount of splash by droplet impingement and decreases the amount of film adhesion. However, the effects of fuel spray and fuel film temperature on the film formation process of impinging wall spray under low temperature conditions is not clear. In this paper, the spray droplets impinging on the wall were set in the same condition by changing the wall temperature only. The effect of the temperature change on the film formation process was estimated by measuring the film temperature and thickness of the spray droplets while their impingement on the wall. It is found that as the liquid film temperature decreased, the amount of droplet adhesion to the liquid film decreases because the amount of splash increases when droplets imping on the film.

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Details 詳細情報について

  • CRID
    1390859835690643840
  • DOI
    10.11351/jsaeronbun.54.704
  • ISSN
    18830811
    02878321
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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