Abstract
Measurements of temporal changes in the velocity of droplets of diesel fuel sprays were conducted near the nozzle orifice by a laser 2-focus velocimeter (L2F). The L2F had a high sampling frequency of 15MHz. Fuel sprays were injected intermittently into the atmosphere by using an 8-hole injector nozzle. The diameter of the nozzle orifice was 0.101 mm. The injection pressure was set at 80MPa. The time interval between injections was 333ms. Measurement positions were located at 10 mm from the nozzle exit. The number of data measured was 40,000. Turbulence intensity of droplet velosity was determined as relative standard deviation of velocity. Spray width was evaluated by high-speed images of spray. The measurement result showed that there was a strong negative correlation between droplet turbulence intensity and spray width.
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