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Effect of Ambient Pressure on Diesel Fuel Sprays Near Injector Nozzle
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
A laser 2-focus velocimeter (L2F) with a micro-scale probe was used for measurements of velocity and size of droplets in diesel sprays. The diameter of the nozzle orifice was 0.113 mm. The injection pressure was set at 80 and 120 MPa by using a common rail system and the ambient pressure was varied from 0.1 to 3 MPa. Measurement positions were located at 6, 9 and 12 mm from the nozzle exit. It was clearly shown that the droplet size was decreased with the increase of ambient pressure and also decreased with the distance from the nozzle exit. Effect of ambient pressure on the velocity of droplets was not remarkable. It was found that the decrease in Weber number due to disintegration of droplets had a strong relation with Weber number.