Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
Impingement behavior of iso-octane spray injected from DGI nozzle was investigated. Adhesion behavior was evaluated by adhered mass and adhered area. Ground glass was used in order to evaluate the adhesion behavior. Adhered mass increased with increasing the injection period. The adhered film area was able to evaluate with ground glass. When fuel spray adhered on a ground glass wall, the light transmitted only through adhesion area of liquid fuel. This liquid film area where light was transmitted was observed from bottom direction. Adhered area of iso-octane spray on a ground glass wall was measured under injection pressure condition (Pinj= 3.0MPa) and two impingement distances (z= 30 mm and 50 mm) with dry wall and wet wall conditions. Fuel injection was varied by injection pattern. The total injection period was 15 ms for single shot injection (case1). As for the 3 shot split injection, interval of split shots was 5 ms in Case 2. Injection period of each split shot was 6.8 ms to keep the same total injection mass as the single injection. It means total injection period of 3 shot split injection was 20.4 ms. Area of fuel film was evaluated at during and after fuel injection by analyzing the bottom view image taken with a high speed camera. After injection finished, adhesion area still increased until a few milli-seconds elapsed under dry wall and wet wall conditions. It was the same as adhered behavior of case1 and Case2.
