2D Simultaneous Measurements of Droplets Diameter and Velocity in a Diesel Spray by Using Improved ILIDS Method

Abstract

The characteristics of a diesel spray, such as the diameter, the velocity and the droplet distribution on a 2D plane were simultaneously measured by using an improved ILIDS (Interferometric Laser Imaging for Droplet Sizing) method. The experiments were performed with an accumulator type unit injector system and a constant-volume high-pressure vessel under the condition of quiescent ambient gas. The injection pressure and ambient gas pressure were set at 60/100 MPa and 0.1/1 MPa, respectively. The injection duration was set at 2 ms, and measurements were made at 1.5 ms after the end of injection. The orifice diameter of the injector used was 0.24 mm with a single hole. The measurement was made at 40-60 mm from the nozzle-tip. As a result, the correlations between the droplet size, the velocity and the spatial distribution were found under different injection and ambient gas pressures.