Gasohol blends spray visualisation by using video image

Abstract

Simplified visualisation of the fuel spray developing process of varied ethanol content in an open spray by the liquid injection technique. For obtaining spray characteristics in the liquid, the visualisation principles were based on spray penetrations images. The video imaging and schlieren technique have been used to investigate the spray development and behaviours at different injection time defined as the delay time from the start of injection (SOI) to the image recording in the viewing area. Similar spray developing patterns of blended fuels and pure gasoline are observed. In the case of schlieren image, the main spray tip penetration decreases and the spray angle increases with the increase of ethanol fraction which indicates a better vaporization.