Spray characteristics of V-type intersecting hole nozzles for diesel engines

A new-type nozzle named V-type intersecting hole nozzle was proposed for diesel engines. The formation of fan-shaped spray was proven by means of high-speed imaging technique. The spray characteristics including spray angle and spray tip penetration were studied by the comparison of two V-type intersecting hole nozzles with different intersecting angles and a single hole nozzle under variable boundary conditions. The experiment focusing on the characteristics of fuel droplets diameter was also carried out by using Phase Doppler Anemometry, PDA. In order to qualitatively analyze the characteristics of spray distribution and air entrainment, a concept named spray volume enhancement ratio, δSVER, was used to obtain the volume ratio of the formed spray and the injected fuel. Comparing to conventional nozzles, the two V-type intersecting hole nozzles showed a significant improvement of spray spatial distribution with the same exit area and injection pressure level according to the δSVER.