ID 144

Adhesion behavior of iso-octane spray impinging on a hot surface

 

Abstract:

In this study, in order to understand adhesion behavior of fuel spray on a cylinder wall and piston top, impingement and adhesion areas of iso-octane spray injected from DISI injector were evaluated using a hot plate of ground quartz glass. Here, the impingement and adhesion areas were able to evaluate with ground quartz glass. The impingement area could be observed from bottom direction. When fuel spray adhered on a ground quartz glass surface, the light transmitted through adhesion area of liquid fuel. Adhesion area of iso-octane spray on a ground quartz glass surface was measured at various impingement distance and surface temperature conditions (Ts = 25ºC，50ºC，75ºC，100ºC，130ºC，170ºC and 200ºC). It was also measured in different injection patterns such as single and split (3 shots) injections. Adhesion area was evaluated at during and after fuel injection by analyzing the bottom view image taken with a high speed camera. As the result, it was shown that impingement and adhesion areas decreased with increase of the wall temperature. Furthermore, it was also shown that impingement and adhesion areas for split shot were less than that of single shot injection.