Technical Paper
An Investigation on Droplet Size Distribution and Evaporation of Diesel Fuel Sprays at High Injection Pressure by Using Laser Diagnostic Technique
1992-02-01
920090
A series of experimental studies on the diesel fuel spray characteristics were carried out in a constant volume bomb. The bomb was charged with nitrogen gas and equipped with quartz windows for using the laser diffraction instrument and with a reconstructed CUMMINS PT system for getting a single shot injection of fuel at an injection pressure as high as 130 MPa. A heater within the bomb enables the temperature of the charge to be increased to 800 K. A Malvern 2604C Particle Sizer based on Fraunhofer diffraction principle was used to measure the size distribution of the fuel droplets. The main results obtained in this paper show that the SMD (Sauter Mean Diameter is the diameter of a droplet whose ratio of volume to surface area is equal to that of the entire spray) of a spray at high injection pressure is much smaller than that at ordinary injection pressure and with the temperature rising, the smaller droplet fraction of the total decreases and the SMD increases.
