Abstract
To elucidate the process of fuel-air mixture formation before ignition in diesel engines, it is important ot investigate the disintegration of fuel flow and droplet formation in intermittent sprays at the very early stage of injection. In this study, the microscopic structures of nonevaporating sprays up to 0.5 ms from the start of injection are studied using photographs with high time resolution, using a nanosecond spark light source. The results show that the fuel flows have very distinctive shapes just after the start of injection. Fragments of disintegrated fuel are observed even at 50 microseconds from the commencement of injection. Ambient pressure has a great effect on the mode of disintegration.
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