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L2F Measurement of Spray Droplets Breakup With Mega-Hertz Data Rate Sampling
Published October 01, 2007 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
A laser 2-focus velocimeter (L2F) with micro-scale probe was used for the measurements of velocity and size of droplets in a diesel fuel spray near the spray center 15 mm downstream from the nozzle exit. The injection pressure was set 70 and 100 MPa by using a common rail injector. Droplets? light scattering signal was detected just after the spray tip reached the measurement position. It was confirmed that the rate of data sampling should be increased to mega-hertz order for the measurement of narrow distance between droplets. With the increase in rail pressure, the droplet velocity increases and the droplet size decreases. It is understood that the droplet?s number density increases with the rail pressure.