Study of Heterogeneous Structure in Diesel Fuel Sprays by Using 2-D Phase Doppler Anemometer

Abstract

2-D phase doppler technique was used for the measurements of the velocity, size, and flight direction of droplets in diesel sprays. The diameter of the nozzle orifice was 0.113mm. The rail pressure was set at 40MPa by using a common rail system. Measurement position was located at 40mm from the nozzle exit. A part of droplets near the spray center had the radial velocity component to the spray periphery. On the contrary, a part of droplets in the periphery region had the radial velocity component to the spray center. It is understood that combination of these two radial transfers of droplets develops vortices in the periphery region. It is shown that these two radial transfers occurred alternately.