Technical Paper
Measurement of Droplet Size Distribution of Transient Diesel Spray
1993-11-01
931949
To clarify the atomization characteristics of transient diesel spray droplet size distribution of spray was measured and Sauter mean diameter (SMD) was also calculated using the optical method based on Fraunhofer diffraction theory at different locations along the spray axis and at different time from the start of injection. To investigate the effects of various operating parameters on drop sizes the injection pressure and the density of gas phase into which spray injected was varied. At each location of spray the timewise measurement of SMD showed its peak value at initial stage and gradually decreased to reach an almost constant value noting that the fully developed spray and droplet - gas equilibrium were being approached. This indicated that the atomization of spray was not a process that ended as the liquid left the nozzle exit but one that continued in time and space.