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      • Behavior of GDI fuel spray adhered on a wall

        ( Kengo Jinnai ),( Yoshihiro Kobayashi ),( Masataka Arai ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-

        Impingement behavior of iso-octane spray injected from GDI nozzle was investigated. Ground glass plate was used as an impingement wall to observe trace-mark of liquid film on the wall. When fuel spray adhered on the ground glass plate, the light transmitted only through adhesion area of liquid fuel. This light-transmitted liquid film area was observed from bottom side of the impingement plate. The trace-mark image of liquid film was taken by high-speed camera during and after injection period. It was binarized and evaluated as the adhered area of liquid film. Adhesion area was measured under two injection pressure conditions (P<sub>inj</sub>=0.6MPa and 3.0MPa) and two impingement distances (z= 30 mm and 50 mm) with dry wall and wet wall conditions. The total injection period was 15 ms for single shot injection. As for the split injection (10ms x 3 shots), interval of split injection was 5ms but total injected mass was kept to be same as the single injection. Fuel adhesion started when spray tip arrived at the impingement plate, its area expanded with injection elapsed however it was always narrower than the wall spray area that was observed as a general top view image of impingement spray. Further, adhesion area still increased during a few milli-seconds after injection finished. During the interval period of split injection, adhesion area was also expanded. Adhesion area on wet wall was narrower than that on dry wall because of secondary splash from wet wall. Since the continuous increase of adhesion area during the interval period was cancelled by the splash caused by following split spray, there was no apparent difference on adhesion film behaviors of single and split fuel injection. Larger increase rate of adhesion area was obtained at P<sub>inj</sub>=3.0MPa than that at P<sub>inj</sub>=0.6MPa, but qualitative behavior of adhesion area was not affected by the injection pressure.

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